CN109578013B - Method for treating tunnel collapse roof fall by adopting advanced small conduit pre-grouting process - Google Patents
Method for treating tunnel collapse roof fall by adopting advanced small conduit pre-grouting process Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 79
- 230000008569 process Effects 0.000 title claims abstract description 51
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- 239000000463 material Substances 0.000 claims abstract description 56
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 48
- 239000004568 cement Substances 0.000 claims abstract description 38
- 239000010881 fly ash Substances 0.000 claims abstract description 33
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 29
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims abstract description 25
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 239000000440 bentonite Substances 0.000 claims abstract description 16
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 16
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 16
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 14
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 7
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 23
- 238000005553 drilling Methods 0.000 claims description 15
- 239000011398 Portland cement Substances 0.000 claims description 10
- 238000007689 inspection Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 238000009412 basement excavation Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 230000035699 permeability Effects 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 11
- 239000011435 rock Substances 0.000 description 11
- 239000011148 porous material Substances 0.000 description 10
- 239000004575 stone Substances 0.000 description 9
- 239000011440 grout Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 229910052918 calcium silicate Inorganic materials 0.000 description 4
- 235000012241 calcium silicate Nutrition 0.000 description 4
- 239000004567 concrete Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- JLDKGEDPBONMDR-UHFFFAOYSA-N calcium;dioxido(oxo)silane;hydrate Chemical compound O.[Ca+2].[O-][Si]([O-])=O JLDKGEDPBONMDR-UHFFFAOYSA-N 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 210000004911 serous fluid Anatomy 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
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- 238000013461 design Methods 0.000 description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
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- 239000000047 product Substances 0.000 description 2
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- 238000003756 stirring Methods 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 235000019976 tricalcium silicate Nutrition 0.000 description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
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- 235000005340 Asparagus officinalis Nutrition 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
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- 239000002893 slag Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Geology (AREA)
- Ceramic Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention provides a method for treating tunnel collapse roof by adopting an advanced small-conduit pre-grouting process, and relates to the technical field of tunnel protection. The method comprises the following steps: s1, preparing in an early stage; s2, pre-grouting of the advanced small guide pipe: constructing by adopting an advanced small conduit pre-grouting process and an advanced small conduit pre-grouting process; the double-liquid grouting material comprises a liquid A and a liquid B, wherein the liquid B is water glass; the liquid A comprises the following components in parts by weight: cement, fly ash, bentonite, disodium hydrogen phosphate, aluminum oxide, sodium hydroxide and water; uniformly mixing the solution A and the solution B according to the volume ratio of 1: 0.2-1 to obtain the double-fluid grouting material; and S3, effect monitoring. By adopting the two-fluid grouting material to treat tunnel collapse roof fall through the construction process of advanced small conduit pre-grouting, the problem that the gel of the traditional cement-water glass slurry is too fast can be solved to a certain extent, the structural stability and durability are improved, and the construction cost is reduced.
Description
Technical Field
The invention relates to the technical field of tunnel protection, in particular to a method for treating tunnel collapse roof by adopting an advanced small-conduit pre-grouting process.
Background
Along with the development of economy in China, more and more highway construction projects are provided. When the highway in the mountainous area is constructed and passes through a shallow buried section with thinner stratum coverage, collapse and roof collapse accidents often occur. In severe cases, the large collapse not only blocks the opening of the hole to influence the progress of the project, but also has serious threat to the life of constructors. How to effectively treat collapse and roof fall of shallow sections of highway tunnels is a problem of important attention at present.
The grouting material is the main substance which plays a role in filling and consolidating in the cracks and pores of the stratum and is the key for realizing the water plugging or strengthening effect. Grouting materials can be divided into particulate slurries, chemical slurries and fine mineral slurries. The currently applied granular grouting materials mainly comprise single-fluid cement paste, clay cement paste and cement-water glass paste. The cement-water glass grout, also called C-S grout, is a grout material which is formed by using cement and water glass as main agents, adding an accelerating agent or a retarder according to a certain proportion and adopting a double-liquid injection mode. The C-S slurry has good application effect in treating road and railway, water conservancy and hydropower, geotechnical engineering water permeation accidents and blocking water leakage of well walls, and has more reinforcement application in various fields in recent years. The advantages are that the gel time can be flexibly adjusted from a few seconds to a few minutes according to the needs, the material source is wide, the price is cheap, and no toxicity is generated. However, long-term engineering practice shows that the durability of the C-S serous fluid stone body is poor, the use of the C-S serous fluid is limited because the later strength of the stone body is generally accepted to be reduced, and the C-S serous fluid is only used as a temporary material in some industries and is rarely used for permanent reinforcement.
The invention patent with the application number of CN201811083630.4 discloses a modified double-liquid grouting material, which adopts zeolite powder, slag and cement to form modified cement grout, and then the modified cement grout is mixed with water glass to obtain the grouting material, so that the defect of poor durability of the traditional C-S grout is overcome to a certain extent, but the problems of over-fast gel and poor structural stability still exist when the tunnel collapse roof fall condition is treated, particularly the condition of a strongly weathered sandstone tunnel.
In addition, when grouting is performed by using a grouting material, geological conditions in front of a tunnel face need to be firstly detected, and generally, means such as a geological survey method and geophysical prospecting are commonly used. After geological conditions in front of the tunnel face are found out, targeted advanced pre-grouting can be implemented according to the geological conditions, and the advanced pre-grouting generally adopts a drilling and grouting parallel operation mode. If large-flow underground water is exposed in the advanced pre-grouting drilling process, drilling equipment needs to be replaced and grouting equipment needs to be installed, the process is complex, time and labor are consumed, water cannot be quickly blocked, and the cost of pumping and draining is increased.
Disclosure of Invention
The invention aims to solve the problems, provides a method for treating tunnel collapse roof by adopting an advanced small conduit pre-grouting process, can solve the problem that the gel of the traditional cement-water glass slurry is too fast to a certain extent, improves the structural stability and durability, and reduces the construction cost.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for treating tunnel collapse roof by adopting an advanced small conduit pre-grouting process comprises the following steps:
s1, early preparation: and (3) grouting and backfilling the collapse pit on the ground surface, then finishing the hardening and sealing treatment of the gully on the ground surface, and well performing gully drainage work to ensure that water flow in the gully does not directly seep.
S2, pre-grouting of the advanced small guide pipe: and constructing by adopting an advanced small-conduit pre-grouting process and an advanced small-conduit pre-grouting process.
The double-liquid grouting material comprises a liquid A and a liquid B, wherein the liquid B is water glass; the liquid A comprises the following components in parts by weight: 500-700 parts of cement, 200-300 parts of fly ash, 100-200 parts of bentonite, 5-30 parts of disodium hydrogen phosphate, 0-20 parts of aluminum oxide, 5-10 parts of sodium hydroxide and 800-1000 parts of water; and uniformly mixing the solution A and the solution B according to the volume ratio of 1: 0.2-1 to obtain the double-fluid grouting material.
S3, effect monitoring: carrying out a water absorption rate or permeability coefficient test 14d after grouting is finished, and judging whether the slurry is qualified; and grouting plugging is enhanced when water leakage points are met in the excavation process, and the side wall is ensured to have no open water.
Preferably, the baume degree of the water glass is 25-38 Be'.
Preferably, the cement is ordinary portland cement with a strength of 42.5.
Preferably, the water content of the fly ash is less than 0.2%, and the particle size is 5-25 μm.
Preferably, the two-fluid grouting material is obtained by uniformly mixing the solution A and the solution B according to the volume ratio of 1: 0.5.
Preferably, in step S2, the advanced small duct pre-grouting process includes: positioning, drilling, installing and grouting.
Preferably, in the drilling process, the angle of the long guide pipe is 8-12 degrees, and the angle of the short guide pipe is 15-25 degrees.
Preferably, in the grouting process, the initial pressure is 0.3Mpa, the final pressure is 1.0Mpa, and the pressure is rapidly increased from the initial pressure to the final pressure and is kept until the grouting is finished; when the grouting pressure reaches the final pressure of 1.0Mpa and the injection amount of the double-liquid grouting material reaches more than 80 percent of the calculated value, the grouting can be stopped.
Preferably, in step S3, the water inflow of the inspection hole should be less than 0.4L/min.m, the water inflow of the inspection hole should be less than 2L/min.m under a pressure of 1.0MPa, otherwise, drilling and grouting should be performed.
Setting and hardening mechanism of cement-water glass slurry:
the cement component being tricalcium silicate (C)2S), dicalcium silicate (C)2S), tricalcium aluminate (C)3A) And tetracalcium aluminoferrite (C)4AF). The first two are the main components of the cement and account for 70-80 percent of the total mass of the cement. The hydration reaction products of tricalcium silicate and dicalcium silicate are essentially identical and are calcium silicate hydrate (C-S-H) and calcium hydroxide (Ca (OH)2) The difference between the hydration reaction speed and the hydration heat is only. The hydration reaction can be expressed by the following formula:
C3S(C2S)→C-S-H+nCa(OH)2 (1)
the hydration product of cement, namely calcium silicate hydrate, is in a colloidal state and is almost insoluble in water, and the generated calcium hydroxide quickly reacts with water glass, wherein the reaction process is as follows:
nCa(OH)2+Na2·SiO2+mnH20→n(CaO·SiO2·mH20)↓+2NaOH (2)
the reaction is continuously carried out to generate a colloidal body with certain strength, and the colloidal body is cemented with the rock mass to be grouted, and the strength of the colloidal body is continuously increased and converted into a stable solidified body, thereby achieving the purpose of grouting and reinforcing.
The fly ash and cement-water glass slurry alkali-activated polymerization mechanism is as follows:
research shows that NaOH, fly ash and bentonite may react to produce zeolite-like matter to form alkali-excited gel material, Na+Present in the hydrated product in a chemically bound form. The polymer prepared by reacting NaOH with fly ash has good Na+The solidifying ability can improve the pore structure of the concretion body, so that the total porosity of the concretion body is reduced, the average pore diameter is reduced, and the pore structure is refined, thereby improving the later-stage compressive strength of the concretion body.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. the method for treating tunnel collapse roof by adopting the advanced small conduit pre-grouting process adopts the two-fluid grouting material, and on the basis of the traditional cement-water glass slurry, the fly ash, the bentonite, the disodium hydrogen phosphate, the aluminum oxide and the sodium hydroxide are added, so that the gelation time of the two-fluid slurry is delayed, and the pore structure of the concretion body is improved, so that the strength and the durability of the concretion body are improved.
The added fly ash and bentonite can react under the basic submission to generate zeolite-like substances to form alkali-activated gelled materials, so that the pore structure of the concretion body is improved, the total porosity of the concretion body is reduced, the average pore diameter is reduced, the pore structure is refined, and the later-stage compressive strength of the concretion body is improved. At present, the price of 42.5 cement is half higher than that of fly ash, and fly ash is doped to replace part of cement, so that the construction cost is saved to a certain extent while water shutoff is achieved. The bentonite is added, so that the impermeability of the stone body of the slurry can be improved, the slurry leakage and ineffective diffusion in the grouting process are reduced, the grouting material is saved, and the grouting efficiency is improved.
The disodium hydrogen phosphate can be added to obviously delay the gelation time of the double-fluid slurry, so that the double-fluid slurry is not rapidly condensed to cause the phenomenon of pipe blockage, and the early strength performance can not be lost due to too long delayed coagulation, thereby improving the compressive strength of the calculus body. NaOH and fly ash are added to react to generate zeolite-like substances to form alkali-activated cementing materials, so that the pore structure of the concretion body is improved, and the later-stage compressive strength of the concretion body is improved.
2. The method for treating tunnel collapse roof by adopting the advanced small duct pre-grouting process adopts the advanced small duct pre-grouting mode, the hole forming condition is better in the small duct and hole body excavation process, the duct is smoothly jacked in, the hole collapse and other conditions do not occur, the next procedure can be carried out without waiting for a long time after the pre-grouting is finished, the full degree and the setting time of the pre-grouting on the working surface meet the actual requirements, and the loss of the construction period is reduced. The small guide pipes are arranged in a radial mode, surrounding rocks at the periphery are effectively reinforced, the surrounding rocks participate in stress, and the stability of the surrounding rocks without large pipe shed support is compensated.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A method for treating tunnel collapse roof by adopting an advanced small conduit pre-grouting process comprises the following steps:
s1, early preparation: and (3) grouting and backfilling the collapse pit on the ground surface, then finishing the hardening and sealing treatment of the gully on the ground surface, and well performing gully drainage work to ensure that water flow in the gully does not directly seep.
S2, pre-grouting of the advanced small guide pipe: and constructing by adopting an advanced small-conduit pre-grouting process and an advanced small-conduit pre-grouting process.
The double-liquid grouting material comprises a liquid A and a liquid B, wherein the liquid B is water glass; the liquid A comprises the following components in parts by weight: 700 parts of cement, 200 parts of fly ash, 100 parts of bentonite, 20 parts of disodium hydrogen phosphate, 10 parts of aluminum oxide, 10 parts of sodium hydroxide and 1000 parts of water; and uniformly mixing the solution A and the solution B according to the volume ratio of 1: 0.5 to obtain the double-fluid grouting material.
The baume degree of the water glass is 35 Be'. The cement is ordinary portland cement with the strength of 42.5.
The water content of the fly ash is less than 0.2%, and the particle size is 15 mu m.
The pre-grouting process for the advanced small guide pipe comprises the following steps: positioning, drilling, installing and grouting. In the drilling process, the angle of the long guide pipe is 8-12 degrees, and the angle of the short guide pipe is 15-25 degrees. In the grouting process, the initial pressure is 0.3Mpa, the final pressure is 1.0Mpa, and the pressure rapidly rises from the initial pressure to the final pressure and is kept until the grouting is finished; when the grouting pressure reaches the final pressure of 1.0Mpa and the injection amount of the double-liquid grouting material reaches more than 80 percent of the calculated value, the grouting can be stopped.
S3, effect monitoring: carrying out a water absorption rate or permeability coefficient test 14d after grouting is finished, and judging whether the slurry is qualified; and grouting plugging is enhanced when water leakage points are met in the excavation process, and the side wall is ensured to have no open water.
The water inflow of the inspection hole is less than 0.4L/min.m, the water inflow of the inspection hole is less than 2L/min.m under the pressure of 1.0MPa, and otherwise, drilling and grouting are carried out.
Example 2
Compared with the embodiment 1, the method for treating the roof fall of the tunnel collapse by adopting the advanced small-conduit pre-grouting process has the advantages that the formula of the double-liquid grouting material in the step S2 is different, and other steps are the same.
The double-liquid grouting material comprises a liquid A and a liquid B, wherein the liquid B is water glass; the liquid A comprises the following components in parts by weight: 600 parts of cement, 300 parts of fly ash, 100 parts of bentonite, 20 parts of disodium hydrogen phosphate, 10 parts of aluminum oxide, 10 parts of sodium hydroxide and 1000 parts of water; and uniformly mixing the solution A and the solution B according to the volume ratio of 1: 0.5 to obtain the double-fluid grouting material.
The baume degree of the water glass is 35 Be'. The cement is ordinary portland cement with the strength of 42.5.
The water content of the fly ash is less than 0.2%, and the particle size is 15 mu m.
Example 3
Compared with the embodiment 1, the method for treating the roof fall of the tunnel collapse by adopting the advanced small-conduit pre-grouting process has the advantages that the formula of the double-liquid grouting material in the step S2 is different, and other steps are the same.
The double-liquid grouting material comprises a liquid A and a liquid B, wherein the liquid B is water glass; the liquid A comprises the following components in parts by weight: 500 parts of cement, 300 parts of fly ash, 200 parts of bentonite, 20 parts of disodium hydrogen phosphate, 10 parts of aluminum oxide, 10 parts of sodium hydroxide and 1000 parts of water; and uniformly mixing the solution A and the solution B according to the volume ratio of 1: 0.5 to obtain the double-fluid grouting material.
The baume degree of the water glass is 35 Be'. The cement is ordinary portland cement with the strength of 42.5.
The water content of the fly ash is less than 0.2%, and the particle size is 15 mu m.
Example 4
Compared with the embodiment 1, the method for treating the roof fall of the tunnel collapse by adopting the advanced small-conduit pre-grouting process has the advantages that the formula of the double-liquid grouting material in the step S2 is different, and other steps are the same.
The double-liquid grouting material comprises a liquid A and a liquid B, wherein the liquid B is water glass; the liquid A comprises the following components in parts by weight: 450 parts of cement, 350 parts of fly ash, 200 parts of bentonite, 20 parts of disodium hydrogen phosphate, 10 parts of aluminum oxide, 10 parts of sodium hydroxide and 1000 parts of water; and uniformly mixing the solution A and the solution B according to the volume ratio of 1: 0.5 to obtain the double-fluid grouting material.
The baume degree of the water glass is 35 Be'. The cement is ordinary portland cement with the strength of 42.5.
The water content of the fly ash is less than 0.2%, and the particle size is 15 mu m.
Example 5
Compared with the embodiment 1, the method for treating the roof fall of the tunnel collapse by adopting the advanced small-conduit pre-grouting process has the advantages that the formula of the double-liquid grouting material in the step S2 is different, and other steps are the same.
The double-liquid grouting material comprises a liquid A and a liquid B, wherein the liquid B is water glass; the liquid A comprises the following components in parts by weight: 500 parts of cement, 300 parts of fly ash, 200 parts of bentonite, 20 parts of disodium hydrogen phosphate, 10 parts of aluminum oxide, 10 parts of sodium hydroxide and 1000 parts of water; and uniformly mixing the solution A and the solution B according to the volume ratio of 1: 0.2 to obtain the double-fluid grouting material.
The baume degree of the water glass is 35 Be'. The cement is ordinary portland cement with the strength of 42.5.
The water content of the fly ash is less than 0.2%, and the particle size is 15 mu m.
Example 6
Compared with the embodiment 1, the method for treating the roof fall of the tunnel collapse by adopting the advanced small-conduit pre-grouting process has the advantages that the formula of the double-liquid grouting material in the step S2 is different, and other steps are the same.
The double-liquid grouting material comprises a liquid A and a liquid B, wherein the liquid B is water glass; the liquid A comprises the following components in parts by weight: 500 parts of cement, 300 parts of fly ash, 200 parts of bentonite, 20 parts of disodium hydrogen phosphate, 10 parts of aluminum oxide, 10 parts of sodium hydroxide and 1000 parts of water; and uniformly mixing the solution A and the solution B according to the volume ratio of 1: 0.3 to obtain the double-fluid grouting material.
The baume degree of the water glass is 35 Be'. The cement is ordinary portland cement with the strength of 42.5.
The water content of the fly ash is less than 0.2%, and the particle size is 5-25 μm.
Example 7
Compared with the embodiment 1, the method for treating the roof fall of the tunnel collapse by adopting the advanced small-conduit pre-grouting process has the advantages that the formula of the double-liquid grouting material in the step S2 is different, and other steps are the same.
The double-liquid grouting material comprises a liquid A and a liquid B, wherein the liquid B is water glass; the liquid A comprises the following components in parts by weight: 500 parts of cement, 300 parts of fly ash, 200 parts of bentonite, 20 parts of disodium hydrogen phosphate, 10 parts of aluminum oxide, 10 parts of sodium hydroxide and 1000 parts of water; and uniformly mixing the solution A and the solution B according to the volume ratio of 1: 0.5 to obtain the double-fluid grouting material.
The baume degree of the water glass is 35 Be'. The cement is ordinary portland cement with the strength of 42.5.
The water content of the fly ash is less than 0.2%, and the particle size is 15 mu m.
Example 8
Compared with the embodiment 1, the method for treating the roof fall of the tunnel collapse by adopting the advanced small-conduit pre-grouting process has the advantages that the formula of the double-liquid grouting material in the step S2 is different, and other steps are the same.
The double-liquid grouting material comprises a liquid A and a liquid B, wherein the liquid B is water glass; the liquid A comprises the following components in parts by weight: 500 parts of cement, 300 parts of fly ash, 200 parts of bentonite, 20 parts of disodium hydrogen phosphate, 10 parts of aluminum oxide, 10 parts of sodium hydroxide and 1000 parts of water; and uniformly mixing the solution A and the solution B according to the volume ratio of 1: 1 to obtain the double-fluid grouting material.
The baume degree of the water glass is 35 Be'. The cement is ordinary portland cement with the strength of 42.5.
The water content of the fly ash is less than 0.2%, and the particle size is 15 mu m.
The properties of the two-fluid grouting materials prepared in examples 1 to 8 were measured, and the measurement results are shown in table 1.
Table 1 comparison of results
As can be seen from examples 1 to 8 in combination with the data of table 1, the dual fluid grouting material of the present invention can delay the gel time of the dual fluid grouting and improve the pore structure of the stone-forming body, thereby improving the strength and durability of the stone-forming body.
As can be seen from the data of examples 1-4 in combination with Table 1, the gel time of the slurry is gradually increased with the increase of the fly ash content, and the compressive strength of the stone body is increased with the increase of the fly ash content, but the compressive strength is reduced with the increase of the fly ash content, so the dosage is strictly controlled.
It can be seen from the data of examples 5-8 and Table 1 that as the cement-water glass ratio decreases, the water glass content increases and the gel time of the slurry increases, but the compressive strength of the aggregate decreases, which is reasonable at a ratio of 1: 0.5.
Example 9
Concrete construction conditions
The entrance of the stone grinding ridge tunnel is positioned in the suburb of Zhao Ping county in Hezhou city, the exit is positioned in the asparagus town of Zhao Ping county, and the length of the stone grinding ridge tunnel is 4067 m; the maximum buried depth of the tunnel is about 559.5m, the minimum covering soil layer spans the gully, and the thickness is 11.5 m. According to reconnaissance, the terrazzo tunnel region stratum mainly comprises a fourth system residual slope layer, a mud basin system and a subgroup stratum under a cold and military system water gap group, and the four subgroups are respectively as follows from top to bottom: boulder silty clay, strongly weathered argillaceous siltstone, and stroke-cemented argillaceous siltstone. The joint cracks of the tunnel surrounding rock develop relatively, and the rock mass is broken.
Overview of collapse Fall event
A water collecting gully is arranged below the left tunnel at the flat end of the tunnel and 220m away from the tunnel opening, the lowest position of the gully is 11.5m away from the top of the tunnel, the left and right line rock stratum and riverbed areas mainly use a floating rock layer and are under strongly weathered argillaceous siltstones. The rock stratum is extremely broken, is easy to soften when meeting water and loses self-stability, the rock stratum collapses when being tunneled to a ZK57+680 riverbed area at the left line at 12 days 8 and 12 months in 2018, the collapsed soil body is soft silty gravel soil, the arch crown is 2 meters to the left to the arch waist, the circumferential width is about 8 meters, the collapse length in the direction of a large pile is about 6 meters, the collapse depth is about 5 meters, and the collapse amount is about 240m3. And the earth surface collapses to the earth surface 10 th day by 13 days, and the radius of the earth surface is about 4m, and the depth is 3.5 m.
The raw materials are used: cement: huarun cement P.042.5; the water glass is purchased from new material of Zhonghuan company Limited, and the production batch number is xl-QESIV-ZJ-08; the water is drinking water; the test shows that the density of the water glass is 1320Kg/m3, and the baume degree is 35.0 Be'.
The specific treatment scheme is as follows:
a method for treating tunnel collapse roof by adopting an advanced small conduit pre-grouting process comprises the following steps:
s1, early preparation: and (3) grouting and backfilling the collapse pit on the ground surface, then finishing the hardening and sealing treatment of the gully on the ground surface, and well performing gully drainage work to ensure that water flow in the gully does not directly seep.
And (3) filling collapsed cavities in the tunnel with pumping C20 concrete, performing geological pre-exploration on surrounding rocks by using a geological radar, and detecting whether cavities still exist or not, wherein the pumping C20 concrete is used for filling if the cavities are detected.
After the backfill back pressure work in the hole is finished, C20 concrete is pumped into the surface subsidence area in a mode of pipe connection and the like for backfill, and a pump truck and a heavy truck are strictly prohibited to be driven to the range of 20m of the edge of the subsidence pit.
And after the grouting and backfilling of the collapse pit on the ground surface are finished, the hardening and sealing treatment of the gully on the mountain ground surface is finished as soon as possible, and the gully drainage work is well done to ensure that water flow in the gully does not directly seep into the mountain.
S2, pre-grouting of the advanced small guide pipe: and constructing by adopting an advanced small-conduit pre-grouting process and an advanced small-conduit pre-grouting process.
Weighing cement, fly ash, bentonite, disodium hydrogen phosphate, aluminum oxide, sodium hydroxide and water according to the proportion according to the formula of the embodiment 3, and fully and uniformly stirring to prepare uniform slurry, namely liquid A; and weighing water glass, namely the night, according to the proportion, mixing the water glass into the liquid A, and uniformly stirring the mixture again to obtain the double-liquid grouting material.
1. Positioning: according to the designed mileage, the position of the orifice of the small guide pipe is marked on the excavation surface, the annular interval of the small guide pipe is 1.2m, and the longitudinal interval of the small guide pipe is 1.2 m.
2. Drilling: the small guide pipes in the normal water burst-free area are arranged along the radial direction of the tunnel, the water burst area is distributed with the hole spacing of 1 meter long and short in a staggered way according to the calculation of the diffusion radius of the small guide pipes of 0.5 meter, and the steel grating is marked by red paint; and aligning the center of the front end of the steel pipe with the mark, and jacking the steel pipe into the stratum by using wind high-pressure wind, wherein the jacking length is not less than 90% of the length of the steel pipe. The angle of the long guide pipe is about 8-12 degrees, and the angle of the short guide pipe is about 15-25 degrees. After the steel pipe is installed, the rapid-setting mortar is used for blocking the hole opening and the peripheral cracks, and slurry is prevented from overflowing during grouting.
3. Installation: and (3) drilling the processed small catheter into the eyelet, plugging the periphery of the catheter by using plastic cement, and connecting a grouting hose, wherein the length of the outer part of the small catheter is about 35 cm.
4. Grouting: the construction sequence of grouting from the arch part to the bottom is to determine grouting parameters, set up a grouting station, test a pump, perform a water pressure test, perform formal grouting, check and record.
And determining grouting pressure according to water burst pressure (hydrostatic pressure of an excavation working surface and dynamic pressure of water inrush), the size and roughness of cracks, various concentrations of slurry properties and required diffusion radius. The concentration of the slurry is determined according to the coagulation time, the strength of the stone body, the construction operation and other factors.
The grouting sequence is that the short hole is firstly constructed, then the long hole is constructed, and finally the inspection hole is constructed. Constructing according to the principle of ' from outside to inside and from top to bottom ', and simultaneously combining the water source point position and the water flow direction, and constructing according to the sequence from the water holes to the water-free holes '; the construction sequence of the inspection hole is determined according to the field condition after the grouting of the grouting hole is finished.
During grouting, the mixing ratio is generally changed step by step after being diluted, and the gelling time is controlled by the flow coefficient of the two grouting pumps.
When mortar appears in adjacent non-grouting holes; the grouting pressure reaches the design final pressure of 1.0 MPa; when the injection amount of the slurry reaches more than 80 percent of the calculated value, the grouting can be stopped. After grouting, the grout in the pipe is cleaned in time and sealed by plastic cement to increase the rigidity and strength of the small guide pipe.
S3, effect monitoring: carrying out a water absorption rate or permeability coefficient test 14d after grouting is finished, and judging whether the slurry is qualified; and grouting plugging is enhanced when water leakage points are met in the excavation process, and the side wall is ensured to have no open water.
The water inflow of the inspection hole is less than 0.4L/min.m, the water inflow of the inspection hole is less than 2L/min.m under the pressure of 1.0MPa, and otherwise, drilling and grouting are carried out.
The stone grinding ridge tunnel is constructed according to the method in 2018, 8 and 13 days, the stone grinding ridge tunnel smoothly passes through the water-rich section in 2018, 9 and 13 days, the duration is 30d, and a support is excavated for 26m (comprising a lower step and an inverted arch part), which shows that the adoption of the two-liquid grouting material disclosed by the invention is very successful in excavating the collapse roof section by utilizing an advanced pre-grouting technology and combining a small conduit, so that the purposes of design and construction are achieved.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (7)
1. A method for treating tunnel collapse roof by adopting an advanced small conduit pre-grouting process is characterized by comprising the following steps:
s1, early preparation: backfilling the surface collapse pit by grouting, then finishing the hardening and sealing treatment of the surface gully, and well performing gully drainage work to ensure that water flow in the gully does not directly seep;
s2, pre-grouting of the advanced small guide pipe: constructing by adopting an advanced small conduit pre-grouting process; the grouting material is a double-liquid grouting material;
the double-liquid grouting material comprises a liquid A and a liquid B, wherein the liquid B is water glass; the liquid A comprises the following components in parts by weight: 500-700 parts of cement, 200-300 parts of fly ash, 100-200 parts of bentonite, 5-30 parts of disodium hydrogen phosphate, 0-20 parts of aluminum oxide, 5-10 parts of sodium hydroxide and 800-1000 parts of water; uniformly mixing the solution A and the solution B according to the volume ratio of 1: 0.2-1 to obtain the double-fluid grouting material;
the baume degree of the water glass is 25-38 Be', and the cement is ordinary Portland cement with the strength of 42.5;
s3, effect monitoring: carrying out a water absorption rate or permeability coefficient test 14d after grouting is finished, and judging whether the slurry is qualified; and grouting plugging is enhanced when water leakage points are met in the excavation process, and the side wall is ensured to have no open water.
2. The method for treating tunnel collapse roof by adopting the advanced small duct pre-grouting process as claimed in claim 1, wherein in the step S2, the water content of the fly ash is less than 0.2%, and the particle size is 5-25 μm.
3. The method for treating tunnel collapse roof by adopting the advanced small duct pre-grouting process as claimed in claim 1, wherein in step S2, the liquid A and the liquid B are uniformly mixed according to the volume ratio of 1: 0.5 to obtain the double-liquid grouting material.
4. The method for treating tunnel collapse roof by adopting advanced small pipe pre-grouting process as claimed in claim 1, wherein in step S2, the advanced small pipe pre-grouting process comprises: positioning, drilling, installing and grouting.
5. The method for treating tunnel collapse roof by adopting the advanced small-conduit pre-grouting process as claimed in claim 1, wherein the angle of the long conduit is 8-12 degrees and the angle of the short conduit is 15-25 degrees in the drilling process.
6. The method for treating tunnel collapse roof by adopting the advanced small duct pre-grouting process as claimed in claim 5, wherein in the grouting process, the initial pressure is 0.3MPa, the final pressure is 1.0MPa, and the pressure rapidly rises from the initial pressure to the final pressure and is kept until the grouting is finished; when the grouting pressure reaches the final pressure of 1.0Mpa and the injection amount of the double-liquid grouting material reaches more than 80 percent of the calculated value, the grouting can be stopped.
7. The method for treating tunnel collapse roof by adopting the advanced small duct pre-grouting process as claimed in claim 5, wherein in the step S3, the water inflow of the inspection hole is less than 0.4L/min.m, the water inflow of the inspection hole is less than 2L/min.m under the pressure of 1.0MPa, and otherwise, the drilling grouting is encrypted.
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| CN111004008B (en) * | 2019-11-11 | 2021-05-07 | 河北大白阳金矿有限公司 | Method for reinforcing and reinforcing pre-control roof-pillar method ore pillar |
| CN113089447B (en) * | 2021-04-22 | 2022-02-15 | 广东省水利水电第三工程局有限公司 | Concrete pavement void grouting construction method |
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| CN204000900U (en) * | 2014-07-17 | 2014-12-10 | 陕西路桥集团第一工程有限公司 | A kind of ruggedized construction that is applied to the landslide of unsymmetrial loading tunnel hole |
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