CN110566273A - Drainage system and drainage method for treating tunnel surrounding rock fracture water - Google Patents
Drainage system and drainage method for treating tunnel surrounding rock fracture water Download PDFInfo
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- CN110566273A CN110566273A CN201910874979.8A CN201910874979A CN110566273A CN 110566273 A CN110566273 A CN 110566273A CN 201910874979 A CN201910874979 A CN 201910874979A CN 110566273 A CN110566273 A CN 110566273A
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- 239000011435 rock Substances 0.000 title claims abstract description 165
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims description 17
- 238000009412 basement excavation Methods 0.000 claims abstract description 26
- 239000004570 mortar (masonry) Substances 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims description 22
- 238000005553 drilling Methods 0.000 claims description 5
- 229920001903 high density polyethylene Polymers 0.000 claims description 5
- 239000004700 high-density polyethylene Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 description 8
- 239000004744 fabric Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000004746 geotextile Substances 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 230000000246 remedial effect Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the technical field of tunnel drainage, and provides a drainage system for treating tunnel surrounding rock fracture water, which comprises a drainage hole and a surrounding rock drainage pipe, wherein the drainage hole is arranged at a surrounding rock fracture on an excavation exposed surface and extends along the development direction of the surrounding rock fracture; the outer end of the surrounding rock drain pipe penetrates through the primary support structure and is communicated with the upper end of the annular drain pipe. Through in country rock crack department, and set up the wash port along the direction of development of country rock crack, set up the country rock drain pipe of outer end and hoop drain pipe intercommunication in the wash port, make in the mode of country rock crack water collects the drain hole with natural seepage, then lead to the hoop drain pipe through the country rock drain pipe with the country rock crack water in the drain hole, country rock crack water flows into limit portion escape canal through the hoop drain pipe, and the water rethread in the limit portion escape canal gathers central escape canal and finally discharges.
Description
Technical Field
the invention relates to the technical field of tunnel drainage, in particular to a drainage system and a drainage method for treating tunnel surrounding rock fracture water.
background
When a tunnel is constructed in a water-rich mountain with rock mass joints and crack development, the condition of surrounding rock crack water seepage is often met, the construction generally follows the principle of 'mainly draining' to drain underground water in a water pumping mode, and then primary support concrete is constructed. However, when the groundwater level changes with time and the fracture water behind the primary support is enriched again, the primary support is easy to cause the quality problem of leakage water, which brings great trouble to the construction.
Application No. 201820768367.1 entitled anti-clog serviceable tunnel drainage system discloses the following: the drainage system comprises a circumferential drainage blind pipe, a non-woven fabric and a waterproof plate, wherein the circumferential drainage blind pipe is buried between two pieces of lining concrete and primary support concrete of a tunnel, the non-woven fabric and the waterproof plate are sequentially arranged between the circumferential drainage blind pipe and the two pieces of lining concrete, a longitudinal drainage blind pipe and a side ditch are longitudinally arranged along the bottom of the side wall of the tunnel, a central ditch is longitudinally arranged along the bottom of the tunnel, and a transverse connecting pipe is communicated with the side ditch and the central ditch at one end.
Above-mentioned drainage system through setting up hoop drainage blind pipe, geotechnological cloth and the waterproof board between tunnel lining concrete and the first concrete, discharges during groundwater discharges the vertical drainage blind pipe of tunnel lateral wall and side ditch, but when using this drainage system to the tunnel in the rich water mountain body that rock mass joint, crack are developed, has following problem: after the tunnel is built, due to the fact that the water volume of surrounding rock cracks of a water-rich crushing section is large, various coarse and fine particles in underground water are accumulated along with time, so that geotechnical cloth is easily blocked and the filtering function of the geotechnical cloth is gradually disabled, underground water cannot be effectively guided to a side ditch through the geotechnical cloth after the tunnel is initially supported, the water head of the underground water continuously gathered at a rock wall water seepage point is increased, water seepage and even cracking of lining concrete are easily caused, and the structural life and traffic safety of the tunnel in the operation period are further affected.
disclosure of Invention
The invention aims to provide a drainage system and a drainage method for treating tunnel surrounding rock fracture water, which can effectively drain the surrounding rock fracture water in water-rich mountains.
The technical scheme adopted by the invention for solving the technical problems is as follows: the drainage system for treating the fracture water of the tunnel surrounding rock comprises an edge drainage ditch and a central drainage ditch which are arranged at the bottom of the tunnel; a transverse drain pipe for communicating the edge drain ditch with the central drain ditch; the tunnel excavation drainage system comprises a primary support structure arranged on an excavation exposed surface of a tunnel, and an annular drainage pipe arranged on the surface of the primary support structure, wherein the lower end of the annular drainage pipe is communicated with an edge drainage ditch;
The device also comprises a drain hole which is arranged at the position of the surrounding rock crack on the excavation exposed surface and extends along the development direction of the surrounding rock crack, and a surrounding rock drain pipe arranged in the drain hole; the outer end of the surrounding rock drain pipe penetrates through the primary support structure and is communicated with the upper end of the annular drain pipe.
further, the device also comprises sealing mortar which is arranged on the excavation exposed surface and used for sealing the hole opening of the drain hole and the surrounding rock cracks.
Further, a hole sealing baffle plate sleeved on the surrounding rock drain pipe is arranged in the drain hole; the distance between the hole sealing baffle and the orifice of the drain hole is L, wherein L is more than or equal to 20cm and less than or equal to 60 cm.
Furthermore, the inner diameter of the drain hole is D, and the depth of the drain hole is H; wherein D is more than or equal to 10cm and less than or equal to 20cm, and H is more than or equal to 3m and less than or equal to 7 m.
Furthermore, be provided with a plurality of hole of permeating water on the pipe wall of country rock drain pipe.
Furthermore, the opening part at the inner end of the surrounding rock drain pipe and the water permeable hole are both provided with filter screens.
Further, country rock drain pipe, hoop drain pipe and horizontal drain pipe are the HDPE bellows.
Further, the inner walls of the surrounding rock drain pipe, the annular drain pipe and the transverse drain pipe are provided with smooth layers.
The drainage method for treating the tunnel surrounding rock fracture water comprises the following steps:
s1, after each section of tunnel is excavated, performing geological sketch on the excavated surface, and marking the positions of the seepage points of the surrounding rock cracks on the excavated surface and the development direction of the surrounding rock cracks;
S2, drilling drainage holes at the water seepage points of the surrounding rock cracks on the excavated exposed surface along the development direction of the surrounding rock cracks; then inserting the inner end of the surrounding rock drainage pipe into the drainage hole, and enabling the outer end of the surrounding rock drainage pipe to be positioned outside the drainage hole;
S3, pouring plugging mortar at the orifice of the drain hole, and spraying the plugging mortar at the surrounding rock crack of the excavated exposed surface;
S4, constructing a primary support structure; then at the surperficial installation hoop drain pipe of just supporting structure, communicate the upper end of hoop drain pipe with the outer end of country rock drain pipe, communicate the lower extreme and the limit portion escape canal of hoop drain pipe.
Further, in step S3, before pouring the plugging mortar into the opening of the drainage hole, a hole sealing baffle plate is installed in the drainage hole and sleeved on the surrounding rock drainage pipe.
The invention has the beneficial effects that:
1. According to the drainage system and the drainage method for treating the tunnel surrounding rock fissure water, the drainage holes are formed in the surrounding rock fissure and along the development direction of the surrounding rock fissure, the surrounding rock drainage pipe with the outer end communicated with the circumferential drainage pipe is arranged in the drainage holes, the surrounding rock fissure water is collected into the drainage holes in a natural seepage mode, then the surrounding rock fissure water in the drainage holes is led to the circumferential drainage pipe through the surrounding rock drainage pipe, the surrounding rock fissure water flows into the edge drainage ditch through the circumferential drainage pipe, and the water in the edge drainage ditch is collected into the central drainage ditch through the transverse drainage pipe and finally drained.
2. The method can effectively discharge surrounding rock crack water in the water-rich mountains, fundamentally solves the problems of leakage water of the primary support structure of the tunnel during construction and accumulated water and cracking of the lining structure during operation, and greatly improves the water-proof and drainage capacity of the tunnel; the remedial measures such as grouting and water plugging and the like which are taken after the water seepage of the primary support structure and the lining structure of the water-rich tunnel are avoided, and the treatment cost is saved.
3. The invention can drill holes and install a drainage system according to the positions of the water seepage points of the on-site surrounding rock fractures, has the advantages of flexible arrangement, good pertinence, low cost and no need of later maintenance, and has simple and easy implementation process and stable and reliable drainage process.
Drawings
FIG. 1 is a schematic structural diagram of a drainage system for treating fracture water of tunnel surrounding rock according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a tunnel after excavation is completed according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a drainage system after completion of construction according to an embodiment of the present invention;
Fig. 4 is a schematic structural diagram of a surrounding rock drainage pipe in the embodiment of the invention.
The reference numbers in the figures are: 1-drain hole, 2-surrounding rock drain pipe, 3-hole sealing baffle, 4-sealing mortar, 5-circumferential drain pipe, 6-edge drain ditch, 7-transverse drain pipe, 8-central drain ditch, 9-primary support structure, 10-lining structure, 11-water-rich rock mass, 12-surrounding rock crack, 13-excavation exposed surface, 21-permeable hole and 22-filter screen.
Detailed Description
The invention is further illustrated with reference to the following figures and examples. In the drawings, the shape and thickness may be exaggerated for simplicity and convenience of illustration.
As shown in fig. 1, the drainage system for treating the fracture water of the surrounding rock of the tunnel according to the embodiment of the invention comprises edge drainage ditches 6 and a central drainage ditch 8 which are arranged at the bottom of the tunnel; a lateral drain pipe 7 for communicating the edge drain 6 with the center drain 8; the tunnel excavation drainage system comprises a primary support structure 9 arranged on an excavation uncovering surface 13 of the tunnel, and an annular drainage pipe 5 arranged on the surface of the primary support structure 9, wherein the lower end of the annular drainage pipe 5 is communicated with an edge drainage ditch 6; the device also comprises a drainage hole 1 which is arranged at the position of the surrounding rock crack 12 on the excavation uncovering surface 13 and extends along the development direction of the surrounding rock crack 12, and a surrounding rock drainage pipe 2 which is arranged in the drainage hole 1; the outer end of the surrounding rock drain pipe 2 penetrates through the primary support structure 9 and is communicated with the upper end of the annular drain pipe 5.
the excavation uncovering surface 13 refers to the surface of a rock body exposed after the tunnel is excavated. The primary support structure 9 is a primary support structure arranged on the excavation uncovering surface 13, and aims to support the tunnel in time when the tunnel is excavated so as to reduce surrounding rock looseness and prevent collapse.
Because the surrounding rock fractures 12 in the water-rich rock mass 11 are channels for the enrichment and seepage of underground water, after the tunnel is excavated, water will be discharged from the surrounding rock fractures 12 on the excavated surface 13, the drainage system of this embodiment, by arranging the drainage holes 1 at the surrounding rock cracks 12 and along the development direction of the surrounding rock cracks 12, a surrounding rock drainage pipe 2 with the outer end communicated with a circumferential drainage pipe 5 is arranged in the drainage hole 1, firstly, surrounding rock crack water around the drainage hole 1 is gathered in the drainage hole 1 in a natural seepage mode, and then leading the surrounding rock crack water in the drain hole 1 to the annular drain pipe 5 through the surrounding rock drain pipe 2, leading the surrounding rock crack water into the edge drain ditch 6 through the annular drain pipe 5, and collecting the water in the edge drain ditch 6 to the central drain ditch 8 through the transverse drain pipe 7 and finally discharging the water so as to achieve the purpose of smoothly discharging the surrounding rock crack water in the rock body behind the primary support structure 9.
as shown in fig. 1, the outer end of the surrounding rock drainage pipe 2 is communicated with the upper end of the annular drainage pipe 5, and the inner end of the surrounding rock drainage pipe 2 is inserted into the drainage hole 1; the depth of the inner end of the surrounding rock drainage pipe 2 inserted into the drainage hole 1 can be set according to actual needs; preferably, the inner end of the surrounding rock drainage pipe 2 is inserted into the bottom of the drainage hole 1. Preferably, the wall of the surrounding rock drainage pipe 2 is provided with a plurality of water permeable holes 21; by arranging the water permeable holes 21, the efficiency of surrounding rock crack water in the water drainage holes 1 flowing into the surrounding rock water drainage pipe 2 is improved. Preferably, the openings of the inner ends of the surrounding rock drainage pipes 2 and the positions of the permeable holes 21 are provided with filter screens 22. Through setting up filter screen 22, the in-process that the wall rock crack water in wash port 1 flowed into wall rock drain pipe 2 filters thick, fine particle such as grit, glutinous grain in the wash port 1, prevents that thick, fine particle such as grit, glutinous grain from blockking up whole drainage system in entering wall rock drain pipe 2 through the hole of permeating water 21.
Preferably, the inner diameter of the drain hole 1 is D, and the depth of the drain hole 1 is H; wherein D is more than or equal to 10cm and less than or equal to 20cm, and H is more than or equal to 3m and less than or equal to 7 m.
the circumferential drainage pipe 5 is arranged on the surface of the primary support structure 9 and is arranged along the cross section of the tunnel in a reversing mode, and a layer of geotextile is wrapped on the outer surface of the circumferential drainage pipe 5. The slopes of the edge drainage ditches 6 and the central drainage ditches 8 are consistent with the slope of the bottom surface of the tunnel; the elevation of 6 bottom surfaces of limit escape canal is higher than the elevation of 8 bottom surfaces of center escape canal, and transverse drainage pipe 7 sets up along the direction slant from 6 to 8 of center escape canals of limit escape canal down to ensure that hydroenergy in the 6 of limit escape canal flows into 8 of center escape canal along transverse drainage pipe 7 nature. Preferably, the transverse drain pipe 7 is arranged at a position 20-50 m along the longitudinal direction of the tunnel, and the outer surface of the transverse drain pipe 7 is wrapped with a layer of geotextile.
Preferably, the surrounding rock drain pipe 2, the circumferential drain pipe 5 and the transverse drain pipe 7 are all HDPE corrugated pipes. The HDPE corrugated pipe is a light pipe made of high-density ethylene, and has the characteristics of light weight, high pressure resistance, good toughness, fast construction, long service life and the like, and the excellent pipe wall structure greatly reduces the cost compared with the pipe with other structures, and because the connection is convenient and reliable, the HDPE corrugated pipe can replace a large number of concrete pipes and cast iron pipes. Preferably, the inner walls of the surrounding rock drain pipe 2, the annular drain pipe 5 and the transverse drain pipe 7 are provided with smooth layers, so that the smoothness of the inner wall of the drain pipe is improved, and the pipeline is prevented from being blocked by water slag deposition and water scales.
In order to prevent the primary support structure 9 from leaking water, it is preferable that, as shown in fig. 1, the drainage system for treating water in cracks of surrounding rocks of a tunnel according to the embodiment of the present invention further includes a plugging mortar 4 disposed on the excavation exposed surface 13 for sealing the opening of the drainage hole 1 and the cracks 12 of the surrounding rocks.
Firstly, the plugging mortar 4 is used for closing the orifice of the drain hole 1 so as to prevent water in the drain hole 1 from flowing out of the orifice; and secondly, the plugging mortar 4 is also used for sealing the surrounding rock cracks 12 on the excavation exposed surface 13 and near the orifice of the drain hole 1, so that the surrounding rock cracks can be effectively collected in the drain hole 1, the surrounding rock cracks can be prevented from directly permeating the back of the primary support structure 9 from the excavation exposed surface 13, and the water leakage phenomenon of the primary support structure 9 can be further prevented.
The outer diameter of the surrounding rock drainage pipe 2 is smaller than or equal to the inner diameter of the drainage hole 1, when a large gap exists between the outer wall of the surrounding rock drainage pipe 2 and the inner wall of the drainage hole 1, when the orifice of the drainage hole 1 is sealed by the plugging mortar 4, the plugging mortar 4 can enter the drainage hole 1 in a large amount, so that the water permeable hole 21 in the surrounding rock drainage pipe 2 can be blocked, surrounding rock cracks 12 in the rock body can be blocked, and the surrounding rock crack water cannot permeate into the drainage hole 1.
under the condition that the blocking mortar 4 can be ensured to block the orifice of the drain hole 1, in order to reduce the volume of the blocking mortar 4 poured into the drain hole 1 as much as possible, preferably, as shown in fig. 1, a hole-sealing baffle 3 sleeved on a surrounding rock drain pipe 2 is arranged in the drain hole 1; the distance between the hole sealing baffle 3 and the orifice of the drain hole 1 is L, wherein L is more than or equal to 20cm and less than or equal to 60 cm. Preferably, L is 30cm or less and is 50cm or less. When the hole sealing baffle plate is used, the hole sealing baffle plate 3 can be arranged in the drain hole 1, and the inner end of the surrounding rock drain pipe 2 penetrates through a through hole in the center of the hole sealing baffle plate 3 and then is inserted into the drain hole 1. The hole sealing baffle 3 can also be fixed on the surrounding rock drain pipe 2 and inserted into the drain hole 1 along with the surrounding rock drain pipe 2. When the plugging mortar 4 is poured into the orifice of the drain hole 1, the plugging mortar 4 is blocked by the arranged plugging baffle 3, and the volume of the plugging mortar 4 poured into the drain hole 1 is further controlled.
The drainage method for treating the tunnel surrounding rock fracture water comprises the following steps:
s1, after each section of tunnel is excavated, performing geological sketch on the excavated surface 13, and marking the positions of the water seepage points of the surrounding rock cracks on the excavated surface 13 and the development direction of the surrounding rock cracks 12;
S2, drilling drainage holes 1 at the water seepage points of the surrounding rock cracks of the excavated exposed surface 13 along the development direction of the surrounding rock cracks 12; then inserting the inner end of the surrounding rock drainage pipe 2 into the drainage hole 1, and enabling the outer end of the surrounding rock drainage pipe 2 to be positioned outside the drainage hole 1;
S3, pouring plugging mortar 4 at the orifice of the drain hole 1, and spraying the plugging mortar 4 at the surrounding rock crack 12 of the excavated exposed surface 13;
S4, constructing a primary support structure 9; then, the annular drain pipe 5 is arranged on the surface of the primary support structure 9, the upper end of the annular drain pipe 5 is communicated with the outer end of the surrounding rock drain pipe 2, and the lower end of the annular drain pipe 5 is communicated with the edge drain 6.
And step S5, installing transverse drain pipes 7 between the side drain 6 and the central drain 8 along the longitudinal direction of the tunnel by 20-50 m each.
in step S1, after each tunnel is excavated, the excavation exposed surface 13 is subjected to geological sketch, so as to mark the positions of the water seepage points of the surrounding rock cracks on the excavation exposed surface 13 and the development direction of the surrounding rock cracks 12, and prepare for subsequent drilling.
In the step S2, drilling drainage holes 1 at each water seepage point of the surrounding rock fissure of the excavated exposed surface 13 along the development direction of the surrounding rock fissure 12; preferably, the aperture of the drain hole 1 is 10-20 cm, and the depth of the drain hole 1 is 3-7 m. Then, a surrounding rock drainage pipe 2 is inserted into the drainage hole 1, the inner end of the surrounding rock drainage pipe 2 is inserted into the bottom of the drainage hole 1, the outer end of the surrounding rock drainage pipe 2 is located outside the drainage hole 1, and the distance between the outer end of the surrounding rock drainage pipe 2 and the hole opening of the drainage hole 1 is larger than the thickness of the primary support structure 9, so that after the construction of the primary support structure 9 is completed, the outer end of the surrounding rock drainage pipe 2 can penetrate through the primary support structure 9, and the subsequent circumferential drainage pipe 5 is communicated.
In the step S3, pouring plugging mortar 4 at the orifice of the drain hole 1 to seal the orifice of the drain hole 1 and prevent surrounding rock fissure water from permeating into the primary support structure 9 from the orifice of the drain hole 1; and meanwhile, spraying plugging mortar 4 at the surrounding rock cracks 12 of the excavation uncovering surface 13 to seal the rock wall cracks on the excavation uncovering surface 13 and prevent surrounding rock crack water from permeating into the primary support structure 9 from the rock wall cracks on the excavation uncovering surface 13.
in step S4, the primary support structure 9 is constructed to initially support the tunnel to reduce loosening of surrounding rocks and prevent collapse. After the construction of the primary support structure 9 is completed, the annular drain pipes 5 are installed on the surface of the primary support structure 9 and at the positions corresponding to the surrounding rock drain pipes 2, the upper ends of the annular drain pipes 5 are communicated with the outer ends of the surrounding rock drain pipes 2, and the lower ends of the annular drain pipes 5 are communicated with the edge drainage ditch 6.
in step S5, lateral drainage pipes 7 are installed between the side drains 6 and the center drain 8 for 20 to 50m each in the longitudinal direction of the tunnel, so that water in the side drains 6 is collected to the center drain 8 through the lateral drainage pipes 7 and drained.
preferably, in step S3, before pouring the plugging mortar 4 at the opening of the drainage hole 1, the method further includes installing a plugging baffle 3 in the drainage hole 1, wherein the plugging baffle is sleeved on the surrounding rock drainage pipe 2. The distance between the hole sealing baffle 3 and the orifice of the drain hole 1 is L, wherein L is more than or equal to 20cm and less than or equal to 60 cm. Preferably, L is 30cm or less and is 50cm or less.
after the drainage system is installed, the lining structure 10 can be constructed in the tunnel, and the lining structure 10 is a supporting structure which is built according to a certain outline and has enough strength, so that the surrounding rock is stable, and the operation safety is ensured.
The drainage method for treating the water of the surrounding rock cracks of the tunnel can effectively drain the water of the surrounding rock cracks in the water-rich mountain, fundamentally solves the problems of water leakage of the primary support structure 9 during the construction period and water accumulation and cracking of the lining structure 10 during the operation period of the tunnel, and greatly improves the water drainage preventing capability of the tunnel; the remedial measures such as grouting and water plugging and the like adopted by the primary support structure 9 and the lining structure 10 of the water-rich tunnel after water seepage are avoided, and the treatment cost is saved. The invention can drill holes and install a drainage system according to the positions of the water seepage points of the on-site surrounding rock fractures, has the advantages of flexible arrangement, good pertinence, low cost and no need of later maintenance, and has simple and easy implementation process and stable and reliable drainage process.
Claims (10)
1. The drainage system for treating the tunnel surrounding rock fracture water comprises an edge drainage ditch (6) and a central drainage ditch (8) which are arranged at the bottom of a tunnel; a transverse drain pipe (7) for communicating the edge drain ditch (6) with the central drain ditch (8); the tunnel excavation drainage system comprises a primary support structure (9) arranged on an excavation uncovering surface (13) of the tunnel, and a circumferential drainage pipe (5) arranged on the surface of the primary support structure (9), wherein the lower end of the circumferential drainage pipe (5) is communicated with an edge drainage ditch (6);
The device is characterized by further comprising a drainage hole (1) which is arranged at a surrounding rock crack (12) on the excavation uncovering surface (13) and extends along the development direction of the surrounding rock crack (12), and a surrounding rock drainage pipe (2) which is arranged in the drainage hole (1); the outer end of the surrounding rock drain pipe (2) penetrates through the primary support structure (9) and is communicated with the upper end of the annular drain pipe (5).
2. The drainage system for treating the fissure water of the surrounding rock of the tunnel according to claim 1, further comprising a sealing mortar (4) disposed on the excavation uncovering surface (13) for sealing the opening of the drainage hole (1) and the fissure water of the surrounding rock (12).
3. The drainage system for treating the fissure water of the surrounding rock of the tunnel according to claim 2, wherein a hole sealing baffle (3) sleeved on the surrounding rock drainage pipe (2) is arranged in the drainage hole (1); the distance between the hole sealing baffle (3) and the orifice of the drain hole (1) is L, wherein L is more than or equal to 20cm and less than or equal to 60 cm.
4. The drainage system for treating the fissure water of the tunnel surrounding rock according to claim 1, 2 or 3, wherein the inner diameter of the drainage hole (1) is D, and the depth of the drainage hole (1) is H; wherein D is more than or equal to 10cm and less than or equal to 20cm, and H is more than or equal to 3m and less than or equal to 7 m.
5. A drainage system for treating tunnel surrounding rock fissure water according to claim 1, 2 or 3, wherein the wall of the surrounding rock drainage pipe (2) is provided with a plurality of water permeable holes (21).
6. A drainage system for treating tunnel surrounding rock fissure water according to claim 5, wherein a filter screen (22) is arranged at the opening of the inner end of the surrounding rock drainage pipe (2) and at the position of the water permeable hole (21).
7. The drainage system for treating fractured water of tunnel surrounding rocks according to claim 1, wherein the surrounding rock drainage pipe (2), the annular drainage pipe (5) and the transverse drainage pipe (7) are all HDPE corrugated pipes.
8. The drainage system for treating the fissure water of the surrounding rock of the tunnel according to claim 1, wherein the inner walls of the surrounding rock drainage pipe (2), the circumferential drainage pipe (5) and the transverse drainage pipe (7) are provided with smooth layers.
9. The drainage method for treating the tunnel surrounding rock fracture water is characterized by comprising the following steps of:
S1, after each section of tunnel is excavated, performing geological sketch on the excavation uncovering surface (13), and marking the position of a surrounding rock crack seepage point on the excavation uncovering surface (13) and the development direction of a surrounding rock crack (12);
S2, drilling drainage holes (1) at the water seepage points of the surrounding rock cracks of the excavated exposed surface (13) along the development direction of the surrounding rock cracks (12); then inserting the inner end of the surrounding rock drainage pipe (2) into the drainage hole (1), and enabling the outer end of the surrounding rock drainage pipe (2) to be positioned outside the drainage hole (1);
s3, pouring plugging mortar (4) at the orifice of the drain hole (1), and spraying the plugging mortar (4) at the surrounding rock crack (12) of the excavated exposed surface (13);
s4, constructing a primary support structure (9); then, an annular drainage pipe (5) is arranged on the surface of the primary support structure (9), the upper end of the annular drainage pipe (5) is communicated with the outer end of the surrounding rock drainage pipe (2), and the lower end of the annular drainage pipe (5) is communicated with an edge drainage ditch (6).
10. The drainage method for treating the fissure water of the surrounding rock of the tunnel according to claim 9, wherein step S3 further comprises installing a sealing baffle (3) in the drainage hole (1) and covering the drainage pipe (2) of the surrounding rock before pouring the sealing mortar (4) at the opening of the drainage hole (1).
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| CN201910874979.8A CN110566273B (en) | 2019-09-17 | 2019-09-17 | Drainage system and drainage method for treating tunnel surrounding rock fracture water |
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| CN201910874979.8A CN110566273B (en) | 2019-09-17 | 2019-09-17 | Drainage system and drainage method for treating tunnel surrounding rock fracture water |
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| CN111005760A (en) * | 2019-12-27 | 2020-04-14 | 中铁二院工程集团有限责任公司 | Drainage type drainage system for karst tunnel |
| CN111501967A (en) * | 2020-04-20 | 2020-08-07 | 招商局重庆交通科研设计院有限公司 | Scheme for adding central trench to tunnel without interrupting traffic and rapid construction method |
| CN112879090A (en) * | 2021-02-01 | 2021-06-01 | 贵州大学 | Anti-seismic anti-blocking separation drainage structure for tunnel decontamination |
| CN112983539A (en) * | 2021-04-19 | 2021-06-18 | 江西省交通科学研究院有限公司 | Tunnel surrounding rock drainage support structure and construction method |
| CN113464201A (en) * | 2021-06-10 | 2021-10-01 | 贵州大学 | Active drainage method and structure for preventing blockage in tunnel |
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| CN114893246A (en) * | 2022-06-02 | 2022-08-12 | 重庆交通大学 | Maintainable drainage system for tunnel in karst area |
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