CN111058862A - Starting end reinforcement area boulder treatment method - Google Patents
Starting end reinforcement area boulder treatment method Download PDFInfo
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- CN111058862A CN111058862A CN201911330539.2A CN201911330539A CN111058862A CN 111058862 A CN111058862 A CN 111058862A CN 201911330539 A CN201911330539 A CN 201911330539A CN 111058862 A CN111058862 A CN 111058862A
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- 238000000034 method Methods 0.000 title claims description 32
- 230000002787 reinforcement Effects 0.000 title claims description 6
- 238000005553 drilling Methods 0.000 claims abstract description 114
- 238000010276 construction Methods 0.000 claims abstract description 78
- 238000005422 blasting Methods 0.000 claims abstract description 56
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 37
- 239000011435 rock Substances 0.000 claims description 17
- 238000004458 analytical method Methods 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 12
- 230000005641 tunneling Effects 0.000 claims description 10
- 230000003203 everyday effect Effects 0.000 claims description 9
- 238000013016 damping Methods 0.000 claims description 7
- 238000009412 basement excavation Methods 0.000 claims description 6
- 239000011083 cement mortar Substances 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 4
- 230000002411 adverse Effects 0.000 claims description 3
- 238000010835 comparative analysis Methods 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 3
- 239000010438 granite Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000012351 Integrated analysis Methods 0.000 claims 1
- 238000003672 processing method Methods 0.000 abstract 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Soil Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a boulder processing method for a starting end reinforcing area, which is characterized in that three boulder processing modes of boulder blasting, rotary drilling mechanical processing and down-hole dense hole crushing are compared and analyzed according to the boulder situation of the starting end reinforcing area, a construction method that down-hole dense hole crushing is mainly adopted for determining the boulder processing of the starting end reinforcing area is used, and shield construction is safely and smoothly carried out.
Description
Technical Field
The invention relates to a shield tunneling method, in particular to a method for treating boulders in a starting end reinforcing area.
Background
In recent years, with the continuous development of society, more and more rail transit constructions are carried out on a large scale, bedrocks are controlled and influenced by geological structure conditions, rock pulp components and surrounding rock material components, undenatured or slightly weathered hard spheroids, namely 'boulders', are easy to develop in the weathering process, more complicated engineering geological conditions are met in the construction process, and more difficult engineering geological problems are also met. In the shield construction process, the boulder processed by the crusher of the shield machine greatly affects the shield construction, and the cutter abrasion, cutter head blockage and shield load increase are caused if the boulder is light; if the weight is high, the cutter head tool apron deforms, the cutter head is stressed unevenly, so that the main bearing is damaged or the main bearing seal is damaged, and even the large floating stone pushed to the side face of the tunnel by the cutter head can cause the shield to turn, deviate from the axis of the tunnel and the like. It can be seen that the presence of boulders is extremely hazardous. The existence of the boulder has great influence on the shield construction, and ground settlement and equipment damage are easily caused, so that the construction period is influenced.
Disclosure of Invention
The invention provides a technical scheme for treating the boulder in the reinforcing area of the starting end head, analyzes different treatment processes and provides a method for treating the boulder in the warehouse.
According to the boulder condition of the starting end reinforcing area, three boulder processing modes of boulder blasting, rotary drilling mechanical processing and down-hole dense hole crushing are compared and analyzed, and it is determined that the construction method of down-hole dense hole crushing is mainly adopted for boulder processing of the starting end reinforcing area.
Further, the specific method of comparative analysis is as follows:
(1) analyzing the influence of the reinforcing body, the main body structure and the outer plain wall;
(2) analyzing the construction period;
(3) and (4) comprehensive analysis.
Further, the analysis of the influence on the reinforcing body, the main body structure and the outer plain wall is specifically as follows:
due to the particularity that the starting end boulder is positioned in the reinforcing body and is close to the main body structure and the outer wrapping wall, the influence of boulder treatment on the reinforcing body, the main body structure of the starting well and the outer wrapping wall must be fully considered for boulder treatment in the starting end reinforcing area;
for three schemes of boulder blasting, rotary drilling mechanical treatment and down-the-hole density hole crushing, the schemes of rotary drilling mechanical treatment and down-the-hole density hole crushing do not have adverse effects on the reinforcing body, the main body structure of the starting well and the wrapping plain wall; although measures such as isolated drilling damping measures, differential blasting and the like are adopted in the boulder blasting scheme, the starting end reinforcement area is an enclosed body surrounded by an outer plain wall and an underground continuous wall, the energy after blasting is lost in a damping hole and acts in a reinforced soil body and a structure, and potential safety hazards exist for subsequent tunnel portal breaking and shield starting; in addition, the distance between the west boulder and the main body wall of the starting well is only 2.5m, the distance between the east boulder No. 2 and the outer plain wall is less than 1m, and the wall body can crack in the blasting process;
in view of safety, the boulder blasting scheme is not easy to adopt, and the mechanical processing scheme of rotary drilling mechanical processing and down-hole density hole crushing is suitable to adopt;
further, the project period analysis specifically comprises:
① construction period for blasting boulder
In the starting end boulder region, east line mainly treats boulders as boulders No. 2, the boulders No. 2 are drilled by 1 geological drilling machine, and each drilling machine forms 2 holes and 59 holes (the hole row distance is 0.8m multiplied by 0.8 m) every day, and the treatment time is 30 days in total;
blasting treatment of the boulders at the west line end mainly comprises 2 areas, an area composed of boulders No. 6 and 7 and an area composed of boulders No. 4 and 5, and the total number of holes is 186 (the hole row pitch is 0.8m multiplied by 0.8 m); drilling construction is carried out by adopting 2 geological drilling machines, and 46 days are needed in total;
grouting the sleeve valve pipe after east line blasting needs about 7 days, and the time of east line blasting and grouting is 37 days; after western line blasting, grouting for the sleeve valve pipe needs about 15 days, and the western line blasting and grouting time is 61 days;
② construction period of mechanical treatment of rotary drilling rig
46 holes are needed in all the starting end east line No. 2 boulders, the strength of the boulder rock body is 90-100 Mpa, the penetration depth of the gasified granite during rotary drilling is 30cm/h on average, the height of the boulder rock surface is 4-5 m, the soil body drilling is 2h, the rock drilling is 15 hours, and 1 hole is completed every 2 days on average; 2 rotary drilling rigs are adopted for the east-line boulder No. 2, and the drilling time is 60 days in total;
③ construction period for breaking down-hole density holes
290 holes are needed for drilling by a starting end east line No. 2 boulder down-hole drilling machine, the strength of the boulder rock mass is 90-100 Mpa, according to the drilling footage condition of the early-stage down-hole drilling machine, 6 holes can be completed by 1 down-hole drilling machine in the boulder area every day, the occupied area of the down-hole drilling machine is small, 2 boulders can be simultaneously put into 2 machines for drilling, and 12 holes can be completed by 2 down-hole drilling machines every day for 24 days.
According to the method, the east line of boulder blasting construction needs 37 days, the east line of rotary drilling rig construction needs 46 days, the east line of down-the-hole drilling rig construction needs 24 days, and the down-the-hole drilling rig or boulder blasting construction is suitable to be adopted from the aspect of construction period, the mechanical treatment construction period of the rotary drilling rig is long, and the requirement of the overall construction progress of the shield cannot be met.
Further, the comprehensive analysis specifically comprises:
although the construction cost of boulder blasting is low, except that the reinforcing body is damaged, the east tunnel portal breaking operation cannot be carried out during the blasting construction, and the east shield initial tunneling construction node is seriously influenced; the mechanical treatment scheme of the rotary drilling rig has long construction period and cannot meet the requirement of a shield starting node; according to the analysis and comparison in the aspects of construction safety, construction progress, construction operation difficulty and the like, a construction scheme that holes are densely distributed in the down-the-hole to break the boulder is adopted; considering that the starting end boulder is high in strength and wide in distribution, in order to enhance the boulder treatment effect and guarantee shield tunneling, the holes are broken by adopting the down-hole dense holes, the matched holes are treated by adopting a rotary drilling machine, the boulder treatment effect is enhanced, and the boulder treatment period can be shortened.
Further, the method for treating broken boulders through down-hole density hole breaking and rotary drilling mechanical treatment specifically comprises the following steps:
processing by adopting a mode of breaking the boulders by adopting down-hole density holes according to the range and the size of the boulders; drilling holes by using a 150mm down-the-hole drill, wherein the drilling depth is 1m below an excavation contour line, the drilling depth is 23m-27m, the holes are arranged in a quincunx shape with the spacing of 250mm multiplied by 250mm, and the particle size of broken rock fragments is less than 300mm after down-the-hole density holes are crushed;
the construction steps of down-the-hole density hole crushing treatment are as follows: measuring and paying off → positioning of a down-the-hole drill → drilling to a designed elevation → checking a hole → shifting of the drill → backfilling cement mortar;
in order to ensure the stability of the tunnel face and the slurry pressure maintaining in the shield tunneling process, the low-grade cement mortar backfill is carried out on the drill hole synchronously; in order to enhance the boulder crushing treatment effect, 5 rotary drilling holes with the diameter of 1m are arranged on the boulder No. 2 according to the size of the boulder No. 2, the hole depth is 1m below an excavation contour line, and the rotary drilling holes need to be backfilled with low-grade C15 fine-stone concrete synchronously.
The invention provides a method for treating boulders in a warehouse for solving the problem of boulder treatment in a starting end reinforcing area, which is characterized in that three boulder treatment modes of boulder blasting, rotary drilling mechanical treatment and down-hole dense hole crushing are compared and analyzed according to the boulder condition in the starting end reinforcing area, the down-hole dense hole crushing construction method is mainly adopted for determining the boulder treatment in the starting end reinforcing area, and the safe and smooth shield construction is realized.
Drawings
FIG. 1 is a schematic diagram of arrangement of a boulder blasting damping hole and a blast hole of the present invention;
FIG. 2 is a plan view of the No. 2 boulder blasting hole arrangement of the present invention;
FIG. 3 is a plan view of mechanical treatment hole arrangement of the Donglian No. 2 boulder rotary drilling rig of the invention;
FIG. 4 is a plan view of a broken hole arrangement of Donglian No. 2 boulder down-hole density holes of the present invention;
FIG. 5 is a plan view of mechanical treatment and down-hole density hole crushing and hole distribution of the Donglian No. 2 boulder rotary drilling rig of the invention;
FIG. 6 is a down-the-hole density hole fragmentation flow chart.
Detailed Description
According to the boulder condition of the starting end reinforcing area, three boulder processing modes of boulder blasting, rotary drilling mechanical processing and down-hole dense hole crushing are compared and analyzed, and it is determined that the construction method of down-hole dense hole crushing is mainly adopted for boulder processing of the starting end reinforcing area.
Further, the specific method of comparative analysis is as follows:
(1) analysis of influence on reinforcing body, main body structure and outer plain wall
Due to the particularity that the starting end boulder is positioned in the reinforcing body and is close to the main body structure and the outer wrapping wall, the influence of boulder treatment on the reinforcing body, the main body structure of the starting well and the outer wrapping wall must be fully considered for boulder treatment in the starting end reinforcing area;
for three schemes of boulder blasting, rotary drilling mechanical treatment and down-the-hole density hole crushing, the schemes of rotary drilling mechanical treatment and down-the-hole density hole crushing do not have adverse effects on the reinforcing body, the main body structure of the starting well and the wrapping plain wall; although measures such as isolated drilling damping measures, differential blasting and the like are adopted in the boulder blasting scheme, the starting end reinforcement area is an enclosed body surrounded by an outer plain wall and an underground continuous wall, the energy after blasting is lost in a damping hole and acts in a reinforced soil body and a structure, and potential safety hazards exist for subsequent tunnel portal breaking and shield starting; in addition, the distance between the west boulder and the main body wall of the starting well is only 2.5m, the distance between the east boulder No. 2 and the outer plain wall is less than 1m, and the wall body can crack in the blasting process;
in view of safety, the boulder blasting scheme is not easy to adopt, and the mechanical processing scheme of rotary drilling mechanical processing and down-hole density hole crushing is suitable to adopt;
(2) analysis of construction period
① construction period for blasting boulder
In the starting end boulder region, east line mainly treats boulders as boulders No. 2, the boulders No. 2 are drilled by 1 geological drilling machine, and each drilling machine forms 2 holes and 59 holes (the hole row distance is 0.8m multiplied by 0.8 m) every day, and the treatment time is 30 days in total;
blasting treatment of the boulders at the west line end mainly comprises 2 areas, an area composed of boulders No. 6 and 7 and an area composed of boulders No. 4 and 5, and the total number of holes is 186 (the hole row pitch is 0.8m multiplied by 0.8 m); drilling construction is carried out by adopting 2 geological drilling machines, and 46 days are needed in total;
grouting the sleeve valve pipe after east line blasting needs about 7 days, and the time of east line blasting and grouting is 37 days; after western line blasting, grouting for the sleeve valve pipe needs about 15 days, and the western line blasting and grouting time is 61 days;
② construction period of mechanical treatment of rotary drilling rig
46 holes are needed in all the starting end east line No. 2 boulders, the strength of the boulder rock body is 90-100 Mpa, the penetration depth of the gasified granite during rotary drilling is 30cm/h on average, the height of the boulder rock surface is 4-5 m, the soil body drilling is 2h, the rock drilling is 15 hours, and 1 hole is completed every 2 days on average; 2 rotary drilling rigs are adopted for the east-line boulder No. 2, and the drilling time is 60 days in total;
③ construction period for breaking down-hole density holes
290 holes are needed for drilling by a starting end east line No. 2 boulder down-hole drilling machine, the strength of the boulder rock mass is 90-100 Mpa, according to the drilling footage condition of the early-stage down-hole drilling machine, 6 holes can be completed by 1 down-hole drilling machine in the boulder area every day, the occupied area of the down-hole drilling machine is small, 2 boulders can be simultaneously put into 2 machines for drilling, and 12 holes can be completed by 2 down-hole drilling machines every day for 24 days.
According to the method, the east line of boulder blasting construction needs 37 days, the east line of rotary drilling rig construction needs 46 days, the east line of down-the-hole drilling rig construction needs 24 days, and the down-the-hole drilling rig or boulder blasting construction is suitable to be adopted from the aspect of construction period, the mechanical treatment construction period of the rotary drilling rig is long, and the requirement of the overall construction progress of the shield cannot be met.
(3) Comprehensive analysis
Although the construction cost of boulder blasting is low, except that the reinforcing body is damaged, the east tunnel portal breaking operation cannot be carried out during the blasting construction, and the east shield initial tunneling construction node is seriously influenced; the mechanical treatment scheme of the rotary drilling rig has long construction period and cannot meet the requirement of a shield starting node; according to the analysis and comparison in the aspects of construction safety, construction progress, construction operation difficulty and the like, a construction scheme that holes are densely distributed in the down-the-hole to break the boulder is adopted; considering that the starting end boulder is high in strength and wide in distribution, in order to enhance the boulder treatment effect and guarantee shield tunneling, the holes are broken by adopting the down-hole dense holes, the matched holes are treated by adopting a rotary drilling machine, the boulder treatment effect is enhanced, and the boulder treatment period can be shortened.
Further, the method for treating broken boulders through down-hole density hole breaking and rotary drilling mechanical treatment specifically comprises the following steps:
processing by adopting a mode of breaking the boulders by adopting down-hole density holes according to the range and the size of the boulders; drilling holes by using a 150mm down-the-hole drill, wherein the drilling depth is 1m below an excavation contour line, the drilling depth is 23m-27m, the holes are arranged in a quincunx shape with the spacing of 250mm multiplied by 250mm, and the particle size of broken rock fragments is less than 300mm after down-the-hole density holes are crushed;
the construction steps of down-the-hole density hole crushing treatment are as follows: measuring and paying off → positioning of a down-the-hole drill → drilling to a designed elevation → checking a hole → shifting of the drill → backfilling cement mortar;
in order to ensure the stability of the tunnel face and the slurry pressure maintaining in the shield tunneling process, the low-grade cement mortar backfill is carried out on the drill hole synchronously; in order to enhance the boulder crushing treatment effect, 5 rotary drilling holes with the diameter of 1m are arranged on the boulder No. 2 according to the size of the boulder No. 2, the hole depth is 1m below an excavation contour line, and the rotary drilling holes need to be backfilled with low-grade C15 fine-stone concrete synchronously.
The invention provides a method for treating boulders in a warehouse for solving the problem of boulder treatment in a starting end reinforcing area, which is characterized in that three boulder treatment modes of boulder blasting, rotary drilling mechanical treatment and down-hole dense hole crushing are compared and analyzed according to the boulder condition in the starting end reinforcing area, the down-hole dense hole crushing construction method is mainly adopted for determining the boulder treatment in the starting end reinforcing area, and the safe and smooth shield construction is realized.
Claims (6)
1. A starting end reinforcing area boulder treatment method is characterized in that three boulder treatment modes of boulder blasting, rotary drilling mechanical treatment and down-the-hole dense hole crushing are compared and analyzed according to the boulder situation of the starting end reinforcing area, and a construction method of down-the-hole dense hole crushing is mainly adopted for determining the boulder treatment of the starting end reinforcing area.
2. The method of claim 1, wherein the specific method of comparative analysis is:
(1) analyzing the influence of the reinforcing body, the main body structure and the outer plain wall;
(2) analyzing the construction period;
(3) and (4) comprehensive analysis.
3. The method of claim 1, wherein the analysis of the influence on the reinforcement, the body structure, and the outer plain wall is specifically:
due to the particularity that the starting end boulder is positioned in the reinforcing body and is close to the main body structure and the outer wrapping wall, the influence of boulder treatment on the reinforcing body, the main body structure of the starting well and the outer wrapping wall must be fully considered for boulder treatment in the starting end reinforcing area;
for three schemes of boulder blasting, rotary drilling mechanical treatment and down-the-hole density hole crushing, the schemes of rotary drilling mechanical treatment and down-the-hole density hole crushing do not have adverse effects on the reinforcing body, the main body structure of the starting well and the wrapping plain wall; although measures such as isolated drilling damping measures, differential blasting and the like are adopted in the boulder blasting scheme, the starting end reinforcement area is an enclosed body surrounded by an outer plain wall and an underground continuous wall, the energy after blasting is lost in a damping hole and acts in a reinforced soil body and a structure, and potential safety hazards exist for subsequent tunnel portal breaking and shield starting; in addition, the distance between the west boulder and the main body wall of the starting well is only 2.5m, the distance between the east boulder No. 2 and the outer plain wall is less than 1m, and the wall body can crack in the blasting process;
from the safety point of view, the boulder blasting scheme is not easy to adopt, and the mechanical processing scheme of rotary drilling mechanical processing and down-hole density hole crushing is suitable to adopt.
4. The method of claim 1, wherein the time-of-day analysis is specifically:
① construction period for blasting boulder
Starting an end boulder area, wherein the east line mainly treats boulders as boulders No. 2, drilling holes on the boulders No. 2 by adopting 1 geological drilling machine, forming 2 holes and 59 holes on each drilling machine every day, wherein the hole array distance is 0.8m multiplied by 0.8m, and the treatment time is 30 days in total;
blasting treatment of boulders at the west line end mainly comprises 2 areas, an area composed of boulders No. 6 and 7 and an area composed of boulders No. 4 and 5, wherein the total number of holes is 186, and the hole row pitch is 0.8m multiplied by 0.8 m; drilling construction is carried out by adopting 2 geological drilling machines, and 46 days are needed in total;
grouting the sleeve valve pipe after east line blasting needs about 7 days, and the time of east line blasting and grouting is 37 days; after western line blasting, grouting for the sleeve valve pipe needs about 15 days, and the western line blasting and grouting time is 61 days;
② construction period of mechanical treatment of rotary drilling rig
46 holes are needed in all the starting end east line No. 2 boulders, the strength of the boulder rock body is 90-100 Mpa, the penetration depth of the gasified granite during rotary drilling is 30cm/h on average, the height of the boulder rock surface is 4-5 m, the soil body drilling is 2h, the rock drilling is 15 hours, and 1 hole is completed every 2 days on average; 2 rotary drilling rigs are adopted for the east-line boulder No. 2, and the drilling time is 60 days in total;
③ construction period for breaking down-hole density holes
290 holes are needed for drilling by a starting end east line No. 2 boulder down-hole drilling machine, the strength of the boulder rock mass is 90-100 Mpa, according to the drilling footage condition of the early-stage down-hole drilling machine, 6 holes can be completed by 1 down-hole drilling machine in the boulder area every day, the occupied area of the down-hole drilling machine is small, 2 boulders can be simultaneously put into 2 machines for drilling operation, and 24 days are needed for completing 12 holes by 2 down-hole drilling machines every day;
according to the method, the east line of boulder blasting construction needs 37 days, the east line of rotary drilling rig construction needs 46 days, the east line of down-the-hole drilling rig construction needs 24 days, and the down-the-hole drilling rig or boulder blasting construction is suitable to be adopted from the aspect of construction period, the mechanical treatment construction period of the rotary drilling rig is long, and the requirement of the overall construction progress of the shield cannot be met.
5. The method of claim 1, wherein the integrated analysis is specifically:
although the construction cost of boulder blasting is low, except that the reinforcing body is damaged, the east tunnel portal breaking operation cannot be carried out during the blasting construction, and the east shield initial tunneling construction node is seriously influenced; the mechanical treatment scheme of the rotary drilling rig has long construction period and cannot meet the requirement of a shield starting node; according to the analysis and comparison in the aspects of construction safety, construction progress, construction operation difficulty and the like, a construction scheme that holes are densely distributed in the down-the-hole to break the boulder is adopted; considering that the starting end boulder is high in strength and wide in distribution, in order to enhance the boulder treatment effect and guarantee shield tunneling, the holes are broken by adopting the down-hole dense holes, the matched holes are treated by adopting a rotary drilling machine, the boulder treatment effect is enhanced, and the boulder treatment period can be shortened.
6. The method of claim 1, wherein the treatment method for breaking the boulder by using the down-the-hole density hole breaking and rotary drilling machinery comprises the following specific steps:
processing by adopting a mode of breaking the boulders by adopting down-hole density holes according to the range and the size of the boulders; drilling holes by using a 150mm down-the-hole drill, wherein the drilling depth is 1m below an excavation contour line, the drilling depth is 23m-27m, the holes are arranged in a quincunx shape with the spacing of 250mm multiplied by 250mm, and the particle size of broken rock fragments is less than 300mm after down-the-hole density holes are crushed;
the construction steps of down-the-hole density hole crushing treatment are as follows: measuring and paying off → positioning of a down-the-hole drill → drilling to a designed elevation → checking a hole → shifting of the drill → backfilling cement mortar;
in order to ensure the stability of the tunnel face and the slurry pressure maintaining in the shield tunneling process, the low-grade cement mortar backfill is carried out on the drill hole synchronously; in order to enhance the boulder crushing treatment effect, 5 rotary drilling holes with the diameter of 1m are arranged on the boulder No. 2 according to the size of the boulder No. 2, the hole depth is 1m below an excavation contour line, and the rotary drilling holes need to be backfilled with low-grade C15 fine-stone concrete synchronously.
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| CN201911330539.2A CN111058862A (en) | 2019-12-20 | 2019-12-20 | Starting end reinforcement area boulder treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112647955A (en) * | 2020-12-04 | 2021-04-13 | 中铁工程装备集团有限公司 | Excavation blind area pretreatment method and tunnel driving construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112647955A (en) * | 2020-12-04 | 2021-04-13 | 中铁工程装备集团有限公司 | Excavation blind area pretreatment method and tunnel driving construction method |
| CN112647955B (en) * | 2020-12-04 | 2021-12-03 | 中铁工程装备集团有限公司 | Excavation blind area pretreatment method and tunnel driving construction method |
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