Water-blocking grouting material and construction method for sudden water inrush in TBM-driven tunnel

Abstract

The present invention discloses a water-blocking grouting material for sudden water inrush in tunnels bored by TBM, which comprises: 100-500 parts of inorganic grouting material, 4-8 parts of mixed fiber, and 100-300 parts of epoxy resin grouting material. The present invention also discloses a construction method of the water-blocking grouting material for sudden water inrush in tunnels bored by TBM. Different proportions of grouting materials are used according to different water inrush volumes, and a water-blocking process of simultaneous pumping and grouting is adopted, effectively curbing the situations of mud gushing and sand gushing caused by sudden water inrush, and effectively solving the problem of sudden water inrush during tunnel construction. The water-blocking grouting material for sudden water inrush of the present invention, through the combination of inorganic components and organic component slurries, and by adding mixed fiber, not only efficiently blocks the water source, but also increases the strength of the blocking material, avoids the long-term scouring and erosion of the blocking material by water inrush, prevents the destruction of the blocking material and further erosion of the built tunnel, and indirectly extends the service life of the tunnel.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering, and particularly relates to a water-blocking grouting material for sudden water inrush in a TBM-driven tunnel and a construction method thereof. Background Art

[0002] The main construction methods in modern tunnel engineering include: drill and blast method, shield method, lining method, and full-face tunneling boring machine method (TBM). Among them, due to the high efficiency and stability of the TBM method, it has developed rapidly in recent years.

[0003] However, in the construction of TBM tunnel engineering, the engineering geological problems caused by poor geological conditions will also be amplified to a certain extent. For example, sudden water inrush in a tunnel driven by the TBM method will have a great impact on TBM tunneling and increase the risk of collapse. However, in the prior art, when encountering a sudden water inrush accident during the TBM tunneling construction process, the full-face advanced grouting / water blocking treatment method of retreating the TBM tunneling machine to leave a grouting operation space is generally adopted. Although this method can solve the problem of sudden water inrush for some geological conditions, when encountering poor geological conditions and large-scale sudden water inrush, this method is prone to slow drainage in the tunnel and the grouting quality is easily affected by the sudden water inrush. Summary of the Invention

[0004] An object of the present invention is to solve at least the above problems and / or defects and provide at least the advantages described hereinafter.

[0005] Another object of the present invention is to provide a water-blocking grouting material for sudden water inrush in a TBM-driven tunnel, which combines the comprehensive characteristics of inorganic and organic slurries and adds mixed fibers, not only efficiently blocks the water source, but also increases the strength of the blocking material, avoids the long-term scouring and erosion of the blocking material by the inrush water, destroys the blocking material and then erodes the built tunnel, and indirectly extends the service life of the tunnel.

[0006] Another object of the present invention is to provide a construction method of a water-blocking grouting material for sudden water inrush in a TBM-driven tunnel, which uses different proportions of grouting materials according to different water inrush amounts and adopts a water-blocking process of pumping and grouting simultaneously, effectively curbs the mud and sand inrush caused by sudden water inrush, and effectively solves the problem of sudden water inrush during the tunnel construction process.

[0007] In order to achieve these objects and other advantages of the present invention, the technical solution of the present invention is as follows:

[0008] A water-blocking grouting material for sudden water inrush in a TBM-driven tunnel, by mass, comprises: 100-500 parts of inorganic grouting material, 4-8 parts of mixed fiber, and 100-300 parts of epoxy resin grouting material;

[0009] Among them, the inorganic grouting material is ordinary Portland cement grouting material and water-containing fine sand type HSC grouting material or anti-seepage curtain type HSC grouting material.

[0010] Preferably, the hybrid fiber is composed of serrated steel fibers with a diameter of 0.3 mm and a length of 18 mm and polyethylene fibers with a length of 16 mm. Among them, the mass ratio of serrated steel fibers to polyethylene fibers is 1:3.

[0011] Preferably, the epoxy resin grouting material is composed of epoxy resin, curing agent and mortar. Among them, the mass ratio of epoxy resin, curing agent and mortar is 1:1:20, and the curing agent is diethylenetriamine.

[0012] The object of the present invention can also be further achieved by the construction method of the water-blocking grouting material for sudden water inrush in TBM-driven tunnels, which includes the following steps:

[0013] Step 1: Arrange pumping wells: With the vertex of the TBM cutterhead as the center, along the direction of the sudden water flow, at an arc with a radius of 15 m, arrange the punching positions of the pumping wells at intervals of 10 degrees, punch holes, and arrange pumping wells;

[0014] Step 2: Arrange grouting holes: On the heading face contacted by the TBM cutterhead, use a drilling machine to arrange two circles of grouting holes and arrange grouting pipes;

[0015] Step 3: Grout:

[0016] When the water inflow of the grouting hole is greater than 145 m 3 / h, all pumping wells start pumping water, and at the same time all grouting holes are grouted. Among them, in the grouting material, there are 500 parts by mass of inorganic grouting material, 8 parts by mass of hybrid fiber, and 100 parts by mass of epoxy resin grouting material;

[0017] When the water inflow of the grouting hole is greater than 75 m 3 / h and less than 145 m 3 / h, half of the number of pumping wells start pumping water, and at the same time all grouting holes are grouted. Among them, in the grouting material, there are 300 parts by mass of inorganic grouting material, 5 parts by mass of hybrid fiber, and 200 parts by mass of epoxy resin grouting material;

[0018] When the water inflow of the grouting hole is less than 75 m 3 / h, one pumping well set in the middle starts pumping water, and at the same time all grouting holes are grouted. Among them, in the grouting material, there are 100 parts by mass of inorganic grouting material, 4 parts by mass of hybrid fiber, and 300 parts by mass of epoxy resin grouting material;

[0019] Step 4: Seal the holes.

[0020] Preferably, in Step 3, when the water inflow of the grouting hole is greater than 145 m 3When the water inflow is 75 m 3 / h and less than 145 m 3 / h, the grouting pressure is 2 MPa; when the water inflow of the grouting hole is less than 75 m 3 / h, the grouting pressure is 1 MPa.

[0021] Preferably, after arranging the grouting holes, the grouting holes are flushed with clean water until the rock powder and impurities in the holes are washed out until the return water is clean. Among them, the clean water pressure is 85% of the grouting pressure.

[0022] Preferably, the water extraction volume of the water extraction well is not less than 2 / 3 of the water inflow of the grouting hole.

[0023] Preferably, in step two, the ring spacing between two circles of grouting holes is 1.5 m, the hole spacing is 0.5 m, and the hole depth is 8 m.

[0024] Preferably, the drilling machine is a T-27 air-leg drill, and the grouting pipe is made of Φ42 mm hot-rolled seamless steel pipe with a length of 1 m.

[0025] The present invention has at least the following beneficial effects:

[0026] 1. The water-blocking grouting material for sudden water inrush in TBM-driven tunnels of the present invention uses a slurry prepared by mixing inorganic slurry and epoxy resin grouting material in a certain proportion. It not only has the characteristic of fast setting of inorganic slurry, but also has the property that the epoxy resin slurry cures and swells when encountering water, which can block the small seepage channels that cannot be blocked by inorganic slurry, realizing complete water source blocking, improving the blocking effect, and saving the construction period.

[0027] 2. The water-blocking grouting material for sudden water inrush in TBM-driven tunnels of the present invention adds mixed fibers, which not only efficiently blocks the water source, but also increases the strength of the blocking material, avoiding the long-term erosion of the blocking material by the gushing water, damaging the blocking material and then eroding the built tunnel, indirectly extending the service life of the tunnel.

[0028] 3. The construction method of the water-blocking grouting material for sudden water inrush in TBM-driven tunnels of the present invention uses different proportions of grouting materials according to different water inflows, and adopts a water-blocking process of simultaneous pumping and grouting, effectively curbing the gushing mud and sand caused by sudden water inrush, and effectively solving the problem of sudden water inrush during tunnel construction.

[0029] 4. The grouting pipe of the present invention is made of Φ42 mm hot-rolled seamless steel pipe, ensuring that the pipe has sufficient strength and enabling the slurry to flow smoothly in the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a flow chart of the construction method of the water-blocking grouting material for sudden water inrush in TBM-driven tunnels of the present invention;

[0031] Figure 2 This is the layout drawing of the extraction well in the construction method of the water-blocking grouting material for sudden water inrush in the tunnel bored by TBM of the present invention. Specific embodiments

[0032] The following further describes the present invention in detail with reference to the accompanying drawings, so that those skilled in the art can implement it according to the text of the specification.

[0033] <Example 1>

[0034] A water-blocking grouting material for sudden water inrush in the tunnel bored by TBM includes, by mass: 500 parts of inorganic grouting material, 8 parts of mixed fiber, and 100 parts of epoxy resin grouting material;

[0035] Among them, the inorganic grouting material is ordinary Portland cement grouting material (ordinary Portland 425 cement, water-cement ratio 1:1) and water-containing fine sand type HSC grouting material (prepared by a high-speed slurry mixer, where the mixer speed is 1000 - 1200 r / min, the water-cement weight ratio is 1.2:1, and the slurry mixing time is 3 min), and the mass ratio of the two is 3:2;

[0036] The mixed fiber is composed of serrated steel fiber with a diameter of 0.3 mm and a length of 18 mm and polyethylene fiber with a length of 16 mm. Among them, the mass ratio of serrated steel fiber to polyethylene fiber is 1:3;

[0037] The epoxy resin grouting material is composed of epoxy resin, curing agent, and mortar. Among them, the mass ratio of epoxy resin, curing agent, and mortar is 1:1:20. Among them, the curing agent is diethylenetriamine. The specific preparation method: use a low-speed stirrer to fully stir the epoxy resin and the curing agent diethylenetriamine for 5 min, and then add the strong mortar while stirring until a uniform thick slurry is obtained; among them, the mass ratio of epoxy resin, curing agent, and mortar is 1:1:20.

[0038] Finally, mix the inorganic grouting material, mixed fiber, and epoxy resin thick slurry according to the mass fraction ratio to obtain the water-blocking grouting material for sudden water inrush in the tunnel bored by TBM

[0039] <Example 2>

[0040] A water-blocking grouting material for sudden water inrush in the tunnel bored by TBM includes, by mass: 300 parts of inorganic grouting material, 5 parts of mixed fiber, and 200 parts of epoxy resin grouting material;

[0041] Among them, the inorganic grouting material is ordinary Portland cement grouting material (ordinary Portland 425# cement, water-cement ratio 1:1) and water-containing fine sand type HSC grouting material (prepared by a high-speed pulp making machine, where the rotational speed of the pulp making machine is 1000 - 1200 r / min, the weight ratio of water to cement is 1.2:1, and the slurry stirring time is 3 min), and the mass ratio of the two is 2:1;

[0042] The hybrid fiber consists of serrated steel fibers with a diameter of 0.3 mm and a length of 18 mm and polyethylene fibers with a length of 16 mm. Among them, the mass ratio of serrated steel fibers to polyethylene fibers is 1:3;

[0043] The epoxy resin grouting material consists of epoxy resin, curing agent and mortar. Among them, the mass ratio of epoxy resin, curing agent and mortar is 1:1:20. Among them, the curing agent is diethylenetriamine. The specific preparation method: use a low-speed stirrer to fully stir the epoxy resin and the curing agent diethylenetriamine for 5 min, and then add strong mortar while stirring until a uniform thick slurry is obtained; among them, the mass ratio of epoxy resin, curing agent and mortar is 1:1:20.

[0044] Finally, mix the inorganic grouting material, hybrid fiber, and epoxy resin thick slurry according to the mass fraction ratio to obtain the water-blocking grouting material for sudden water inrush in TBM tunneling

[0045] <Example 3>

[0046] A water-blocking grouting material for sudden water inrush in TBM tunneling, which includes by mass: 100 parts of inorganic grouting material, 4 parts of hybrid fiber, and 300 parts of epoxy resin grouting material;

[0047] Among them, the inorganic grouting material is ordinary Portland cement grouting material (ordinary Portland 425# cement, water-cement ratio 1:1) and anti-seepage curtain type HSC grouting material (prepared by a high-speed pulp making machine, where the rotational speed of the pulp making machine is 1000 - 1200 r / min, the weight ratio of water to cement is 0.6:1, and the slurry stirring time is 5 min), and the mass ratio of the two is 1:1;

[0048] The hybrid fiber consists of serrated steel fibers with a diameter of 0.3 mm and a length of 18 mm and polyethylene fibers with a length of 16 mm. Among them, the mass ratio of serrated steel fibers to polyethylene fibers is 1:3;

[0049] The epoxy resin grouting material consists of epoxy resin, curing agent and mortar. Among them, the mass ratio of epoxy resin, curing agent and mortar is 1:1:20. Among them, the curing agent is diethylenetriamine. The specific preparation method: use a low-speed stirrer to fully stir the epoxy resin and the curing agent diethylenetriamine for 5 min, and then add strong mortar while stirring until a uniform thick slurry is obtained; among them, the mass ratio of epoxy resin, curing agent and mortar is 1:1:20

[0050] Finally, an inorganic grouting material, mixed fibers, and an epoxy resin thick slurry are mixed according to a mass fraction ratio to obtain a water-blocking grouting material for sudden water inrush in a TBM-driven tunnel.

[0051] <Example 4>

[0052] A construction method for a water-blocking grouting material for sudden water inrush in a TBM-driven tunnel includes the following steps:

[0053] Step 1: Arrange water extraction wells: With the vertex of the TBM cutter head as the center, along the direction of the sudden water flow, at an arc with a radius of 15 m, arrange the punching positions of the water extraction wells at intervals of 10 degrees, punch holes, and arrange the water extraction wells; the specific arrangement positions are as Figure 2 shown, 1 is the TBM tunneling machine, 2 is the TBM cutter head, 201 is the vertex of the cutter head, 3 is the arranged water extraction well; the arrow direction is the direction of the sudden water inrush;

[0054] Step 2: Arrange grouting holes: On the heading face in contact with the TBM cutter head, use a drilling machine to arrange two circles of grouting holes and arrange grouting pipes; among them, after arranging the grouting holes, rinse the grouting holes with clean water until the rock powder and impurities in the holes are washed out and the return water is clear. Among them, the clean water pressure is 0.85 MPa; a corresponding grouting pipe is arranged for each grouting hole, and the grouting pipe is made of Φ42 mm hot-rolled seamless steel pipe and is 1 m long; the circle spacing between the two circles of grouting holes is 1.5 m, the hole spacing is 0.5 m, and the hole depth is 8 m;

[0055] Step 3: Grout:

[0056] When the water inflow of the grouting hole is greater than 145 m 3 / h, all the water extraction wells start pumping water, and at the same time, all the grouting holes are grouted. Among them, the grouting material used is the grouting material in Example 1, and the grouting pressure is 3 MP;

[0057] When the water inflow of the grouting hole is greater than 75 m 3 / h and less than 145 m 3 / h, half of the number of water extraction wells start pumping water, and at the same time, all the grouting holes are grouted. Among them, the grouting material used is the grouting material in Example 2, and the grouting pressure is 2 MPa;

[0058] When the water inflow of the grouting hole is less than 75 m 3 / h, one water extraction well set in the middle starts pumping water, and at the same time, all the grouting holes are grouted. Among them, the grouting material used is the grouting material in Example 3, and the grouting pressure is 1 MPa;

[0059] Step 4: Seal the holes.

[0060] Among them, the model of the high-speed pulper is ZJY400. The epoxy resin grouting material has good rheological properties and mechanical properties, excellent anti-cracking, anti-seepage and anti-chemical properties, and can be quickly cured at wet interfaces and in wet environments. The hole sealing can be carried out by using existing conventional technologies.

[0061] For the construction section of the pumping well, part of the water can be drained through the water guide pipe by a common water pump to the water area used for construction at the construction site, which can be used for construction water. As the grouting progresses, when the water inflow at the grouting hole of the construction section with a large water inflow drops to less than 20 L / min, the water pump can be suspended, and the punching position of the pumping well can be sealed.

[0062] <Comparative Example 1>

[0063] A water-blocking grouting material for sudden water inrush in TBM tunneling is different from that in Example 1 in that: the inorganic grouting material only includes ordinary Portland cement grouting material (ordinary Portland 425 cement, water-cement ratio 1:1).

[0064] <Comparative Example 2>

[0065] A water-blocking grouting material for sudden water inrush in TBM tunneling is different from that in Example 1 in that: it does not include mixed fibers.

[0066] <Comparative Example 3>

[0067] A water-blocking grouting material for sudden water inrush in TBM tunneling is different from that in Example 1 in that: it does not include epoxy resin grouting material.

[0068] <Comparative Example 4>

[0069] A construction method of a water-blocking grouting material for sudden water inrush in TBM tunneling is different from that in Example 4 in that:

[0070] Step 3. Grouting:

[0071] When the water inflow of the grouting hole is greater than 145 m 3 / h, all grouting holes are grouted. Among them, the grouting material used is the grouting material in Example 1, and the grouting pressure is 3 MP;

[0072] When the water inflow of the grouting hole is greater than 75 m 3 / h and less than 145 m 3 / h, all grouting holes are grouted. Among them, the grouting material used is the grouting material in Example 2, and the grouting pressure is 2 MPa;

[0073] When the water inflow of the grouting hole is less than 75 m 3 / h, all grouting holes are grouted. Among them, the grouting material used is the grouting material in Example 3, and the grouting pressure is 1 MPa.

[0074] <Comparative Example 5>

[0075] A construction method of a water-blocking grouting material for sudden water inrush in a tunnel excavated by TBM, which is different from Example 4 in that:

[0076] Step 3: Grouting:

[0077] All pumping wells start pumping water, and at the same time, all grouting holes are grouted. Among them, the grouting material is the grouting material in Example 1, and the grouting pressure is 3 MP.

[0078] <Comparative Example 6>

[0079] A construction method of a water-blocking grouting material for sudden water inrush in a tunnel excavated by TBM, which is different from Example 4 in that:

[0080] Step 3: Grouting:

[0081] All pumping wells start pumping water, and at the same time, all grouting holes are grouted. Among them, the grouting material is the grouting material in Example 2, and the grouting pressure is 3 MP.

[0082] <Comparative Example 7>

[0083] A construction method of a water-blocking grouting material for sudden water inrush in a tunnel excavated by TBM, which is different from Example 4 in that:

[0084] Step 3: Grouting:

[0085] All pumping wells start pumping water, and at the same time, all grouting holes are grouted. Among them, the grouting material is the grouting material in Example 3, and the grouting pressure is 3 MP.

[0086] <Comparative Example 8>

[0087] A construction method of a water-blocking grouting material for sudden water inrush in a tunnel excavated by TBM, which is different from Example 4 in that:

[0088] Step 3: Grouting:

[0089] When the water inflow of the grouting hole is greater than 145 m 3 / h, all pumping wells start pumping water, and at the same time, all grouting holes are grouted. Among them, the grouting material is the grouting material in Example 1, and the grouting pressure is 3 MP;

[0090] When the water inflow of the grouting hole is greater than 75 m 3 / h and less than 145 m 3 / h, half of the pumping wells start pumping water, and at the same time, all grouting holes are grouted. Among them, the grouting material is the grouting material in Example 1, and the grouting pressure is 2 MPa;

[0091] When the water inflow of the grouting hole is less than 75 m3 When the water inflow of the grouting holes is greater than 145 m

[0092] <Comparative Example 9>

[0093] A construction method of a water-blocking grouting material for sudden water inrush in a TBM-driven tunnel, which is different from that in Example 4 in that:

[0094] Step 3, Grouting:

[0095] When the water inflow of the grouting holes is greater than 145 m 3 / h, all the pumping wells start pumping water, and at the same time, all the grouting holes are grouted. Among them, the grouting material is the grouting material in Example 1, and the grouting pressure is 1 MPa.

[0096] When the water inflow of the grouting holes is greater than 75 m 3 / h and less than 145 m 3 / h, half of the pumping wells start pumping water, and at the same time, all the grouting holes are grouted. Among them, the grouting material is the grouting material in Example 2, and the grouting pressure is 2 MPa;

[0097] When the water inflow of the grouting holes is less than 75 m 3 / h, one pumping well set in the middle starts pumping water, and at the same time, all the grouting holes are grouted. Among them, the grouting material is the grouting material in Example 2, and the grouting pressure is 1 MPa.

[0098] <Comparative Example 10>

[0099] A construction method of a water-blocking grouting material for sudden water inrush in a TBM-driven tunnel, which is different from that in Example 4 in that:

[0100] Step 3, Grouting:

[0101] When the water inflow of the grouting holes is greater than 145 m 3 / h, all the pumping wells start pumping water, and at the same time, all the grouting holes are grouted. Among them, the grouting material is the grouting material in Example 3, and the grouting pressure is 3 MP;

[0102] When the water inflow of the grouting holes is greater than 75 m 3 / h and less than 145 m 3 / h, half of the pumping wells start pumping water, and at the same time, all the grouting holes are grouted. Among them, the grouting material is the grouting material in Example 3, and the grouting pressure is 2 MPa;

[0103] When the water inflow of the grouting holes is less than 75 m 3When the water extraction well in the middle starts to pump water at a rate of [X] m³ / h, all the grouting holes start to grout simultaneously. Among them, the grouting material used is the grouting material in Example 3, and the grouting pressure is 1 MPa.

[0104] For the construction section with the same sudden water inrush in the TBM-driven tunnel (the water inrush volume is less than 75 m³ / h), one water extraction well set in the middle starts to pump water, and all the grouting holes start to grout simultaneously. Among them, the grouting material used is the grouting material in Example 3 and Comparative Examples 1 - 3, the grouting pressure is 1 MPa. After the grouting is completed, the grouting effects are compared as shown in Table 1 below. 3 / h), one water extraction well set in the middle starts to pump water, and all the grouting holes start to grout simultaneously. Among them, the grouting material used is the grouting material in Example 3 and Comparative Examples 1 - 3, the grouting pressure is 1 MPa. After the grouting is completed, the grouting effects are compared as shown in Table 1 below.

[0105] Table 1. Comparison results of the grouting materials in Example 3 and Comparative Examples 1 - 3

[0106]

[0107] The compressive strength test is carried out in accordance with the "Standard for Test Methods of Physical and Mechanical Properties of Concrete" GB / T50080 - 2016. The SYE - 2000 type pressure testing machine is used, with an accuracy class of I, a maximum load of 2000 kN, and its performance meets the national standard requirements. The size of the test specimens selected for the test is 100×100×100 mm (the specimens are sampled by the method of core drilling on site). After taking out the grouting layer specimens 28 days after the grouting is completed, wipe the surface clean with a rag, check the appearance and measure the size of the specimens. After confirmation, place them on the bearing plate of the testing machine for the compressive strength test. During the test, the loading speed is controlled at 5 kN / s - 10 kN / s until the specimens are damaged and record the maximum load.

[0108] It can be seen from the comparison in Table 1 above that for the same sudden water inrush construction section with the same construction process but different grouting materials, the results are very different. Using the grouting material in Example 3 of the present invention can not only quickly block water, but also reduce the investment cost of water blocking. By adding mixed fibers, the compressive strength of the solidified slurry after water blocking is improved, avoiding the long-term erosion of the plugging material by the water inrush, damaging the plugging material and then eroding the built tunnel, and indirectly extending the service life of the tunnel.

[0109] For the construction section with sudden water inrush in the TBM-driven tunnel (the water inrush volume is greater than 145 m³ / h), the grouting water blocking methods in Example 4 and Comparative Examples 4 - 10 of the present invention are respectively used for construction treatment. The results obtained from the comparison of the construction methods in Example 4 and Comparative Examples 4 - 10 are as shown in Table 2 below. 3 / h), the grouting water blocking methods in Example 4 and Comparative Examples 4 - 10 of the present invention are respectively used for construction treatment. The results obtained from the comparison of the construction methods in Example 4 and Comparative Examples 4 - 10 are as shown in Table 2 below.

[0110] Table 2. Comparison results of the construction methods in Example 4 and Comparative Examples 4 - 10

[0111]

[0112] From the comparison in the above table, it can be seen that in the grouting water-blocking construction of tunnels with multiple large-scale water and sand gushing in the construction sections with complex hole-forming conditions, the construction method of the present invention has significant advantages for plugging sudden water gushing in tunnels. The present invention adopts a water-blocking construction method of plugging + drainage (draining water through pumping wells) for sudden water gushing in tunnels with large water inflows, reducing the difficulty of grouting construction, improving the efficiency of grouting plugging, and reducing the occurrence of the flushing of grouting materials due to ultra-high-pressure water gushing. As the water inflow decreases, some pumping wells are closed, saving the construction input cost. By using different grouting materials for grouting according to different water inflows, increasing the proportion of inorganic grouting materials when the water inflow is large to achieve the plugging of holes with large water inflows, and as the water inflow decreases, reducing the proportion of inorganic grouting materials and cooperating with a high proportion of epoxy resin grouting materials to assist in plugging small water inflow holes after the large water inflow holes are plugged by inorganic grouting materials, improving the plugging efficiency, shortening the plugging construction time, and reducing the plugging cost. Epoxy resin quickly cures in a humid environment to form a high crack-resistant and impermeable plugging material, and HSC ultra-fine cement can assist in plugging small seepage sections. Through composite grouting plugging, it effectively ensures the grouting water-blocking of construction sections with sudden water gushing in tunnels and tunnels with multiple large-scale water and sand gushing, saving construction time and input.

[0113] Although the embodiments of the present invention have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details and the examples shown and described herein.

Claims

1. A construction method of a water-blocking grouting material for sudden water inrush in a tunnel excavated by a TBM, characterized in that, It includes the following steps: Step 1: Arrange water extraction wells: With the vertex of the TBM cutter head as the center, along the direction of the gushing water flow, at an arc with a radius of 15 m, arrange the punching positions of the water extraction wells at intervals of 10 degrees, drill holes, and arrange the water extraction wells; Step 2: Arrange grouting holes: On the heading face in contact with the TBM cutter head, use a drilling machine to arrange two circles of grouting holes and arrange grouting pipes; Step 3: Grout; When the water inflow of the grouting hole is greater than 145 m 3 / h, all pumping wells start pumping water, and at the same time, all grouting holes are grouted. Among them, in the grouting material, there are 500 parts by mass of inorganic grouting material, 8 parts by mass of mixed fiber, and 100 parts by mass of epoxy resin grouting material; When the water inflow of the grouting hole is greater than 75 m 3 / h and less than 145 m 3 / h, half of the extraction wells are started for pumping water, and at the same time, all grouting holes are grouted. Among them, in the grouting material, there are 300 parts by mass of inorganic grouting material, 5 parts by mass of mixed fiber, and 200 parts by mass of epoxy resin grouting material; When the water inflow of the grouting hole is less than 75m 3 / h, one water extraction well set in the middle starts pumping water, and at the same time, all grouting holes are grouted. Among them, in the grouting material, there are 100 parts by mass of inorganic grouting material, 4 parts by mass of mixed fiber, and 300 parts by mass of epoxy resin grouting material; Step 4: Seal the holes; Among them, the inorganic grouting material is ordinary Portland cement grouting material and water-containing fine sand type HSC grouting material or anti-seepage curtain type HSC grouting material.

2. The construction method according to claim 1, characterized in that, The hybrid fiber is composed of serrated steel fibers with a diameter of 0.3 mm and a length of 18 mm and polyethylene fibers with a length of 16 mm. Among them, the mass ratio of the serrated steel fibers to the polyethylene fibers is 1:

3.

3. The construction method according to claim 1, characterized in that, The epoxy resin grouting material is composed of epoxy resin, curing agent, and mortar. Among them, the mass ratio of the epoxy resin, curing agent, and mortar is 1:1:

20. Among them, the curing agent is diethylenetriamine.

4. The construction method according to claim 1, characterized in that, In Step 3, when the water inflow of the grouting hole is greater than 145 m 3 / h, the grouting pressure is 3 MPa; when the water inflow of the grouting hole is greater than 75 m 3 / h and less than 145 m 3 / h, the grouting pressure is 2 MPa; when the water inflow of the grouting hole is less than 75 m 3 / h, the grouting pressure is 1 MPa.

5. The construction method according to claim 1, characterized in that, After arranging the grouting holes, conduct a clear water flushing of the grouting holes until the rock powder and impurities in the holes are flushed out and the return water is clear. Among them, the clear water pressure is 85% of the grouting pressure.

6. The construction method according to claim 1, characterized in that, The water extraction volume of the water extraction wells is not less than 2 / 3 of the water gushing volume of the grouting holes.

7. The construction method according to claim 1, characterized in that, In Step 2, the ring spacing between the two circles of grouting holes is 1.5 m, the hole spacing is 0.5 m, and the hole depth is 8 m.

8. The construction method according to claim 1, characterized in that, The drilling machine is a T-27 pneumatic leg drill, and the grouting pipe is made of Φ42mm hot-rolled seamless steel pipe with a length of 1 m.

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