CN113982642B - Casting method of advanced curtain - Google Patents
Casting method of advanced curtain Download PDFInfo
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- CN113982642B CN113982642B CN202111223718.3A CN202111223718A CN113982642B CN 113982642 B CN113982642 B CN 113982642B CN 202111223718 A CN202111223718 A CN 202111223718A CN 113982642 B CN113982642 B CN 113982642B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The application relates to the technical field of tunnel construction, and discloses a pouring method of an advanced curtain, which mainly comprises the following steps: step S1: advanced geological forecast: step S2: and (3) measuring and paying off: determining the forming position of the curtain layer, thereby determining the drilling position of the grouting holes, marking the drilling position, and enabling the distances between two adjacent grouting holes to be equal; step S3: pouring a grout stopping wall: step S4: burying a pipe: drilling to a required depth at the marked drilling position, and burying an orifice pipe; continuing drilling along the orifice tube to a design depth; step S5: grouting: grouting into grouting holes, wherein the grouting sequence is that an outer ring hole and a bottom hole are firstly grouting, and then a middle hole is grouting from bottom to top after sealing, and grouting is performed at intervals on each ring of drilling holes; step S6: and (3) effect checking: and a plurality of inspection holes are formed in one side, far away from the fault fracture zone, of the curtain layer, and whether the water outlet condition in the inspection holes meets the standard is detected. The curtain wall structure strength uniformity improvement method has the effect of improving the curtain wall structure strength uniformity.
Description
Technical Field
The application relates to the field of tunnel construction, in particular to a pouring method of an advanced curtain.
Background
The karst areas in China are very widely distributed, nearly 340 ten thousand square kilometers, and are the most widely distributed countries in the karst areas worldwide. Along with the high-speed construction of heavy infrastructure projects such as traffic, water conservancy and hydropower in China, more and more project facilities are gradually transferred to the underground and built in karst areas.
When a high-pressure water-rich karst tunnel is constructed and poor geology such as soft rock, water-rich karst cave and filling karst cave exists in front of a tunnel face, excavation is directly carried out, geological disasters such as collapse and water bursting mud are easy to occur, and the karst water bursting geological disasters gradually become bottleneck problems for restricting the construction scale and development of tunnels in China.
At present, the Chinese patent application with publication number of CN110985001A discloses an advanced curtain grouting construction method suitable for a high-pressure water-rich karst tunnel, which mainly comprises the following steps: the method comprises the following steps: s1, performing advanced geological forecast; s2, determining the position of an orifice: measuring and paying off, determining a grout stop contour line and an excavation contour line, marking a curtain grouting hole drilling position, and determining a drilling direction; s3, pouring a grout stopping wall: determining the length of a concrete grout stop wall according to the section and water outlet condition of the tunnel face, constructing in two sections, conducting drainage work on water outlet points of the tunnel face, cleaning the bottom, and pouring the grout stop wall; s4, drilling holes in sections and burying orifice pipes: the drilling sequence is that the outer ring is firstly followed by the inner ring, the same ring of holes are constructed at intervals, the holes are drilled in sections, the holes are drilled to the required depth, the orifice pipe with the gate valve is buried, the holes are drilled to the designed depth, and the grouting pipe and the grout stop plug are buried; in step S2, the curtain grouting holes are arranged in a circular ring with the central axis of the tunnel as the center, the reinforcing rings around the tunnel and the grouting diffusion radius are symmetrically arranged, the upper half section of the tunnel is perforated, and the holes are radiated to the reinforcing rings of the full section of the tunnel.
With respect to the related art, the inventor considers that the radial hole is formed and grouting is performed, the distance between two adjacent grouting holes is gradually increased, the soil quantity between the two grouting holes is also increased, the internal structural strength of the grouting molded component is uneven, and the defect of uneven wall strength of the curtain wall exists.
Disclosure of Invention
In order to alleviate the problem of uneven wall structure strength of the curtain wall, the application provides a pouring method of an advanced curtain wall.
The application provides a pouring method of an advanced curtain, which adopts the following technical scheme:
a pouring method of an advanced curtain mainly comprises the following steps: step S1: advanced geological forecast: detecting the positions of a fault fracture zone and underground water in front of a palm face, and detecting the development condition of karst;
step S2: and (3) measuring and paying off: determining the forming position of the curtain layer, thereby determining the drilling position of the grouting holes, marking the drilling position, and enabling the distances between two adjacent grouting holes to be equal;
step S3: pouring a grout stopping wall: determining the length of a concrete grout stop wall according to the section of the tunnel face and the water outlet condition, and pouring the grout stop wall;
step S4: burying a pipe: drilling to a required depth at the marked drilling position, and burying an orifice pipe; continuing drilling along the orifice tube to a design depth;
step S5: grouting: grouting into grouting holes, wherein the grouting sequence is that an outer ring hole and a bottom hole are firstly grouting, then a middle hole is grouting after sealing, grouting is performed from bottom to top, grouting is performed at intervals of each ring of drilling holes, and grouting adopts a mode of combining forward type sectional grouting and backward type sectional grouting;
step S6: and (3) effect checking: arranging a plurality of inspection holes on one side of the curtain layer far away from the fault fracture belt, detecting whether the water outlet condition in the inspection holes meets the standard, repairing the holes and grouting when the water outlet condition is unqualified, and finishing the pouring of the advanced curtain until the grouting achieves the effect;
through adopting above-mentioned technical scheme, the slip casting hole parallel arrangement of seting up and the distance between two adjacent slip casting holes equals to improve the degree of consistency of the soil content between two slip casting holes, and then improve the degree of consistency of the curtain wall body structural strength after the shaping, improve the protection effect of curtain wall.
Optionally, in step S2, the grouting holes are arranged in a ring with a central axis of the tunnel as a center, and the number of rings is plural, and the distances between adjacent rings are equal.
By adopting the technical scheme, the grouting holes are arranged in a circular ring by taking the central axis of the tunnel as the center, and a curtain layer is formed above the designed position of the tunnel after grouting is performed in the grouting holes, so that the possibility of water bursting disaster is reduced.
Optionally, step S4 mainly includes the following steps: step S41: and (3) hole opening: perforating at the marked position to a required depth; step S42: and (3) mounting an orifice tube: installing an orifice tube into the hole by using an auxiliary installation device; step S43: drilling: the grouting holes are formed by continuing to drill inwards to a specified depth along the orifice pipe.
By adopting the technical scheme, a sectional drilling mode is adopted, holes are drilled on the marked positions on the slurry stop wall to the designed depth, and the hole opening pipe is used for supporting the hole opening, so that the stability of the hole opening in the drilling process is improved; the orifice pipe is installed on the slurry stopping wall through the auxiliary installation device, the possibility of inclination of the orifice pipe is reduced, and the slurry is drilled inwards to a designated depth along the orifice pipe.
Optionally, in step S4, the auxiliary installation device includes a mounting plate, a guiding element and a centering mechanism, a mounting hole is formed in the mounting plate, the mounting element includes a guiding tube and a connecting plate, the connecting plate is sleeved outside the guiding tube, the axis of the guiding tube is collinear with the axis of the mounting hole, the connecting plate is connected with the mounting plate through a bolt, the guiding element is connected to one side of the mounting plate, and the centering mechanism is connected to one side of the mounting plate far away from the guiding element.
By adopting the technical scheme, the centering mechanism is arranged on the mounting plate, and the axis of the mounting hole is collinear with the marked drilling path by using the centering mechanism; the guide pipe is used for guiding the orifice pipe, so that the possibility that the axis of the orifice pipe deviates from a drilling path is reduced, and the accuracy of the installation of the orifice pipe is improved.
Optionally, centering mechanism includes head rod, second connecting rod and locating lever, head rod and second locating lever all with mounting panel vertical fixation connection, the plane that the axis of head rod and second connecting rod place with the axis coplane of mounting hole, head rod and second connecting rod with the distance between the axis of mounting hole equals, locating lever one end with the one end that the mounting panel was kept away from to the head rod rotates to be connected, the locating lever other end with second connecting rod joint, the locating hole has been seted up to locating lever length direction's intermediate position, locating hole and the coaxial setting of mounting hole.
Through adopting above-mentioned technical scheme, before the installation drill way pipe, with head rod and second connecting rod and the butt of end thick liquid wall, remove head rod and second connecting rod and make the mark position be located the locating hole to make the axis and the drilling route collineation of stand pipe. And after the positioning rod is rotated to move to one side of the first connecting rod far away from the second connecting rod, the orifice pipe is installed by using the guide pipe.
Optionally, the guide member has a plurality of guide members, and the guide tube apertures of a plurality of guide members are different.
Through adopting above-mentioned technical scheme, the guide has a plurality ofly, can select corresponding stand pipe according to the pipe diameter of drill way pipe to improve auxiliary installation device's suitability.
Optionally, in step S4, a layered hole is formed, and the hole is formed from a position close to the central axis of the tunnel, and the inner ring hole and the bottom hole are formed first.
Through adopting above-mentioned technical scheme, adopt the layering trompil mode to open on the grout stop wall, open bottom hole, inner circle hole earlier, open outer lane hole again, after the orifice pipe is installed, carry out the trompil to last layer again, improve the stability of trompil operation.
Optionally, the step S3 is used for stopping the construction of the slurry wall in two sections, wherein the first section of slurry stopping wall plays a role in diversion and return to the trough, and the second section of slurry stopping wall plays a role in sealing to form the slurry stopping wall; the grout stopping wall is connected with the rock face into a whole through the anchor rod.
Through adopting above-mentioned technical scheme, the grout stopping wall is constructed in two sections to bury the stock in grout stopping wall, grout stopping wall passes through the stock and is connected as an organic wholely with the rock wall, improves the structural strength of grout stopping wall, thereby improves the security of construction.
In summary, the present application includes at least one of the following beneficial technical effects:
the two adjacent grouting holes are arranged in parallel, and the distances between the two adjacent grouting holes are equal, so that the uniformity of soil content between the two grouting holes is improved, the uniformity of the structural strength of the formed curtain wall body is further improved, and the protection effect of the curtain wall is improved;
the method has the advantages that the hole is drilled to the designed depth at the marked position on the slurry stopping wall in a sectional drilling mode, the hole opening pipe is used for supporting the hole opening, and the stability of the hole opening in the drilling process is improved;
by constructing the grout stopping wall in a sectional mode and embedding the anchor rods in the grout stopping wall, the grout stopping wall is connected with the rock wall into a whole through the anchor rods, the structural strength of the grout stopping wall is improved, and therefore the construction safety is improved.
Drawings
FIG. 1 is a workflow diagram of an embodiment of the present application;
FIG. 2 is a schematic view of a grouting hole opening position in an embodiment of the present application;
FIG. 3 is a workflow diagram of step S4 in an embodiment of the present application;
FIG. 4 is a schematic view of the overall structure of the auxiliary mounting device in an embodiment of the present application;
fig. 5 is a schematic structural view of a centering mechanism portion in the embodiment of the present application.
Reference numerals: 100. grouting holes; 200. a grout stopping wall; 300. an auxiliary mounting device; 310. a mounting plate; 311. a mounting hole; 320. a guide member; 321. a guide tube; 322. a connecting plate; 323. a bolt; 330. a centering mechanism; 331. a first connecting rod; 332. a second connecting rod; 333. a positioning rod; 334. and positioning holes.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-5.
The embodiment of the application discloses a pouring method of an advanced curtain. Referring to fig. 1, a method for pouring an advanced curtain mainly includes the following steps, step S1: advanced geological forecast: and detecting the positions of a fault fracture zone and underground water in front of the face, and detecting the development condition of karst. And determining the generation position of the curtain layer and the length of the required curtain layer according to the detected data.
Referring to fig. 1 and 2, step S2: and (3) measuring and paying off: and determining the forming position of the curtain layer according to the data of the geological forecast, thereby determining the drilling position and drilling path of the grouting holes 100, marking the drilling position, and ensuring that the design distances between two adjacent grouting holes 100 are equal. Through setting up grouting holes 100 in parallel and the distance between two adjacent grouting holes 100 equals to improve the degree of consistency of the soil content between two grouting holes 100, and then improve the degree of consistency of the curtain wall body structural strength after the shaping, improve the protection effect of curtain wall.
Step S3: pouring the grout stop wall 200: and determining the wall length of the concrete grout stop wall 200 according to the section of the tunnel face and the water outlet condition, and pouring the grout stop wall 200. The slurry stopping wall 200 is constructed in two sections, wherein the first section of the slurry stopping wall 200 plays a role in diversion and groove returning, and the second section of the slurry stopping wall 200 plays a role in sealing to form the slurry stopping wall 200; the grout stop wall 200 is integrally connected with the rock face through anchor rods. By constructing the grout stop wall 200 in two sections and embedding the anchor rods in the grout stop wall 200, the grout stop wall 200 is connected with the rock wall into a whole through the anchor rods, so that the structural strength of the grout stop wall 200 is improved, and the construction safety is improved.
Referring to fig. 2, 3 and 4, step S4 mainly includes the steps of: step S41: and (3) hole opening: and (3) adopting a layered hole opening mode, opening holes to required depth at the marked positions, starting to open holes from the position close to the central axis of the tunnel, and opening inner ring holes and bottom holes firstly. Step S42: mounting hole 311 mouth pipe: installing a hole 311 mouth pipe into the hole by using the auxiliary installation device 300; step S43: drilling: drilling continues inwardly along the orifice tube to a specified depth.
The slurry stopping wall 200 is provided with holes in a layered mode, the bottom hole and the inner ring hole are formed firstly, the outer ring hole is formed secondly, after the orifice pipe is installed, the upper layer is provided with holes, and the stability of the hole opening operation is improved. The method adopts a sectional drilling mode, holes are drilled on the marked positions on the grout stop wall 200 to the designed depth, and the orifice is supported by the orifice pipe, so that the stability of the orifice in the drilling process is improved; installing the orifice tube with the auxiliary installation device 300, reducing the possibility of misalignment between the axis of the orifice tube and the aperture path; after the orifice tube is installed, the drilling is carried out inwards to a designated depth along the orifice tube.
Step S5: grouting: grouting into the grouting holes 100, wherein the grouting sequence is that an outer ring hole and a bottom hole are firstly grouting, then a middle hole is grouting after sealing, grouting is performed from bottom to top, grouting is performed at intervals of each ring of drilling, and grouting adopts a mode of combining forward type sectional grouting and backward type sectional grouting.
Step S6: and (3) effect checking: and (3) arranging a plurality of inspection holes below the curtain layer, detecting whether the water outlet condition in the inspection holes meets the standard, repairing the holes and grouting when the water outlet condition is unqualified, and finishing pouring of the advanced curtain until the grouting achieves the effect.
Referring to fig. 4 and 5, the auxiliary mounting device 300 includes a mounting plate 310, and the mounting plate 310 has a rectangular cross section. Mounting plate 310 is provided with mounting holes 311. A guide 320 is installed at one side of the mounting plate 310, and the guide 320 includes a connection plate 322 for connection with the mounting plate 310, and the connection plate 322 is detachably and fixedly connected with the mounting plate 310 through a bolt 323. A guide pipe 321 is fixedly connected to one side of the connecting plate 322 away from the mounting plate 310, and the guide pipe 321 penetrates through the connecting plate 322 to be communicated with the mounting hole 311.
The centering mechanism 330 is installed to the side that mounting panel 310 kept away from the stand pipe 321, and centering mechanism 330 includes head rod 331 and second connecting rod 332, head rod 331 and second locating lever 333 all with mounting panel 310 perpendicular fixed connection, the plane that the axis of head rod 331 and second connecting rod 332 is located is coplanar with the axis of mounting hole 311, and the distance between head rod 331 and the axis of second connecting rod 332 and mounting hole 311 equals. The first connecting rod 331 is rotatably connected with a positioning rod 333 at an end far away from the mounting plate 310, and the rotation axis of the positioning rod 333 is collinear with the axis of the first connecting rod 331. One end of the positioning rod 333, which is far away from the first connecting rod 331, is clamped with the second connecting rod 332, and a positioning hole 334 is formed in the middle position of the positioning rod 333 in the length direction, and the positioning hole 334 and the mounting hole 311 are coaxially arranged.
Referring to fig. 4 and 5, before the pipe is installed in the hole 311, the first and second connecting rods 331 and 332 are brought into contact with the grout stop wall 200, and the first and second connecting rods 331 and 332 are moved so that the marking positions are positioned in the positioning holes 334, thereby aligning the axis of the guide pipe 321 with the drilling path. After the positioning rod 333 is rotated to move to one side of the first connecting rod 331 far away from the second connecting rod 332, the orifice pipe is inserted into the guide pipe 321, the orifice pipe is guided by the guide pipe 321, the orifice pipe passes through the guide pipe 321 and then is installed on the grout stop wall 200, the possibility that the axis of the orifice pipe deviates from a drilling path is reduced, and therefore the accuracy of installation of the orifice pipe is improved.
The implementation principle of the pouring method of the advanced curtain in the embodiment of the application is as follows: by arranging the parallel grouting holes 100, the distances between two adjacent grouting holes 100 are equal, so that the uniformity of soil content between the two grouting holes 100 is improved, the uniformity of the structural strength of the formed curtain wall body is improved, and the protection effect of the curtain wall is improved.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (6)
1. A pouring method of an advanced curtain is characterized by comprising the following steps: mainly comprises the following steps:
step S1: advanced geological forecast: detecting the positions of a fault fracture zone and underground water in front of a palm face, and detecting the development condition of karst;
step S2: and (3) measuring and paying off: determining the forming position of the curtain layer, thereby determining the drilling positions of the grouting holes (100), marking the drilling positions, and enabling the distances between two adjacent grouting holes (100) to be equal;
step S3: pouring a grout stop wall (200): determining the wall length of a concrete grout stop wall (200) according to the section of the tunnel face and the water outlet condition, and pouring the grout stop wall (200);
step S4: burying a pipe: drilling to a required depth at the marked drilling position, and burying an orifice pipe; continuing drilling along the orifice tube to a design depth;
step S5: grouting: grouting into the grouting holes (100), wherein the grouting sequence is that an outer ring hole and a bottom hole are firstly grouting, then a middle hole is grouting after sealing, grouting is performed from bottom to top, grouting is performed at intervals of each ring of drilling, and grouting adopts a mode of combining forward type sectional grouting and backward type sectional grouting;
step S6: and (3) effect checking: arranging a plurality of inspection holes on one side of the curtain layer far away from the fault fracture belt, detecting whether the water outlet condition in the inspection holes meets the standard, repairing the holes and grouting when the water outlet condition is unqualified, and finishing the pouring of the advanced curtain until the grouting achieves the effect;
the step S4 mainly comprises the following steps: step S41: and (3) hole opening: perforating at the marked position to a required depth; step S42: mounting hole (311) mouth pipe: installing a hole (311) mouth pipe into the hole by using an auxiliary installation device (300); step S43: drilling: the grouting device is characterized in that the grouting device is continuously drilled inwards to a specified depth along an orifice pipe to form the grouting hole (100), the auxiliary mounting device (300) comprises a mounting plate (310), a guide piece (320) and a centering mechanism (330) in the step S4, the mounting plate (310) is provided with a mounting hole (311), the guide piece comprises a guide pipe (321) and a connecting plate (322), the connecting plate (322) is sleeved on the outer side of the guide pipe (321), the axis of the guide pipe (321) is collinear with the axis of the mounting hole (311), the connecting plate (322) is connected with the mounting plate (310) through a bolt (323), the guide piece (320) is connected to one side of the mounting plate (310), and the centering mechanism (330) is connected to one side, far away from the guide piece (320), of the mounting plate (310).
2. The method for pouring the advanced curtain according to claim 1, wherein: in the step S2, the grouting holes (100) are arranged in a circular ring with the central axis of the tunnel as the center, a plurality of circular rings are arranged, and the distances between adjacent circular rings are equal.
3. The method for pouring the advanced curtain according to claim 1, wherein: centering mechanism (330) are including head rod (331), second connecting rod (332) and locating lever (333), head rod (331) and second locating lever (333) all with mounting panel (310) vertical fixation connection, the plane that the axis place of head rod (331) and second connecting rod (332) with the axis coplane of mounting hole (311), head rod (331) and second connecting rod (332) with the distance between the axis of mounting hole (311) equals, locating lever (333) one end with the one end rotation connection of mounting panel (310) is kept away from to head rod (331), locating lever (333) other end with second connecting rod (332) joint, locating hole (334) have been seted up to locating lever (333) length direction's intermediate position, locating hole (334) with mounting hole (311) coaxial setting.
4. The method for pouring the advanced curtain according to claim 3, wherein: the guide members (320) are multiple, and the diameters of guide pipes (321) of the guide members (320) are different.
5. The method for pouring the advanced curtain according to claim 1, wherein: in the step S4, a layered hole opening mode is adopted, holes are opened from the position close to the central axis of the tunnel, and an inner ring hole and a bottom hole are opened first.
6. The method for pouring the advanced curtain according to claim 5, wherein: s3, the slurry stopping wall (200) is constructed in two sections, the first section of slurry stopping wall (200) plays a role in diversion and groove returning, and the second section of slurry stopping wall (200) plays a role in sealing to form the slurry stopping wall (200); the grout stop wall (200) is connected with the rock face into a whole through an anchor rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111223718.3A CN113982642B (en) | 2021-10-21 | 2021-10-21 | Casting method of advanced curtain |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111223718.3A CN113982642B (en) | 2021-10-21 | 2021-10-21 | Casting method of advanced curtain |
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| Publication Number | Publication Date |
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| CN113982642A CN113982642A (en) | 2022-01-28 |
| CN113982642B true CN113982642B (en) | 2023-07-18 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493822B (en) * | 2011-12-29 | 2014-04-02 | 中铁二十三局集团有限公司 | Method for performing curtain grouting construction on tunnel by water rich fault influence zone |
| CN110985001A (en) * | 2019-11-05 | 2020-04-10 | 渝黔铁路有限责任公司 | Advanced curtain grouting construction method suitable for high-pressure water-rich karst tunnel |
| CN110924976B (en) * | 2019-12-03 | 2020-09-18 | 中南大学 | Surrounding rock outer ring grouting reinforcement method |
| CN111997623A (en) * | 2020-08-17 | 2020-11-27 | 中铁十九局集团第二工程有限公司 | Tunnel curtain grouting construction method |
| CN112412496A (en) * | 2020-12-03 | 2021-02-26 | 中铁十二局集团有限公司 | Full-section advanced curtain grouting construction method for water-rich broken geological zone tunnel |
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