Water gushing roadway curtain grouting construction method integrating retention wall and grouting

Abstract

The invention discloses a water gushing roadway curtain grouting construction method integrating a retention wall and grouting, which comprises the following steps: step 1, analyzing mine production layout and hydrogeological conditions according to known geological data of a coal mine goaf and a production area, and determining a water gushing roadway needing curtain grouting construction; secondly, a slurry blocking wall is built, the slurry blocking wall is arranged in the middle of the underground roadway or close to the intersection of the main roadway, and the relation between a lower coal roadway and a normal production roadway is cut off; thirdly, grouting filling is conducted on the roadway space through underground grouting filling and ground branch hole exposed coal roadway grouting filling, and grout filling is conducted on the roadway space; 4, construction branch holes are drilled along a top plate and a bottom plate of the roadway, high-pressure grouting is conducted to reinforce the top plate and the bottom plate, and a surrounding rock loose circle and top plate and bottom plate cracks are filled; the curtain grouting construction scheme integrating the retention wall and grouting is adopted, the waterproof and waterproof effect is improved, and the stability of the roadway is also enhanced.

Description

Technical Field

[0001] The present invention belongs to the field of water control in coal mines, and particularly relates to a construction method for curtain grouting of water-inflow roadway integrating a water retaining wall and grouting. This method is especially suitable for solving the problem of the connection and outburst of old goaf water in adjacent mines and the in-use roadway of a production mine. Background Technique

[0002] In coal mine production, the problem of water inrush in the connecting roadway between the goaf and the production area has always been an unavoidable problem, seriously affecting the safe production of the mine. At present, the combination of drainage and blocking is often used to control the water disaster of old goaf water. The drainage of old goaf water is mainly carried out in the caving zone and the roadway in the coal seam floor. The blocking of old goaf water is mainly achieved by injecting slurry into the roadway and its surrounding rock, tectonic fracture zone or goaf to block the fissures in the roadway surrounding rock and fill the space of the roadway or goaf, so as to prevent the outburst of old goaf water. In addition, in order to prevent the water inrush in the roadway from flowing into the roadway of the production mine and affecting its safety, multiple airtight walls or water retaining walls can also be poured at the junction of the two mines of the roadway for water blocking, and cement slurry is injected into the water retaining wall to block the water outlet and water-conducting fissures. Or grouting materials (such as aggregate, cement slurry) are injected into the return airway to build a water blocking wall with a certain length and strength to cut off the water passing channel entering the mine, and at the same time, the water inrush channel and the water inrush water source layer are grouted and blocked to ensure that the water disaster is completely solved. However, these methods are often difficult to effectively cut off the water inrush source and cannot guarantee the safe production of coal mines. Therefore, developing an effective method for treating water-inflow roadway is of great significance for ensuring the safe production of coal mines. Summary of the Invention

[0003] The present invention provides a construction method for curtain grouting of water-inflow roadway integrating a water retaining wall and grouting. By combining the blocking of the mine water-inflow roadway and the ground directional drilling grouting, the isolation treatment of the water-inflow roadway is realized, providing a strong guarantee for the mine production and safety.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A construction method for curtain grouting of water-inflow roadway integrating a water retaining wall and grouting, comprising the following steps:

[0006] Step 1: According to the known geological data of the coal mine goaf and production area, analyze the mine production layout and hydrogeological conditions, and determine the water-inflow roadway that needs to be constructed with curtain grouting;

[0007] Step 2: Build a slurry retaining wall, set it in the middle of the underground roadway or near the intersection of the main roadways, and cut off the connection between the lower coal roadway and the normal production roadway;

[0008] Step 3: Through underground grouting filling and ground branch hole exposure and grouting filling of the coal roadway, fill the roadway space with slurry;

[0009] Step 4: The construction branch holes are drilled along the roof and floor of the roadway respectively, and high-pressure grouting is used to reinforce the roof and floor, filling the loosened surrounding rock zone and the fissures in the roof and floor.

[0010] Step 5: After the treatment work is completed, inspection and reinforcement holes are constructed in the weak area to check the treatment effect.

[0011] Step 6: Through the construction in Step 2, Step 3, Step 4 and Step 5, the filled roadway and surrounding rock form an integral water-blocking curtain.

[0012] Optionally,

[0013] In Step 1, the geological data includes the mine production layout map, underground water level monitoring data, geological section map, mine geological structure plan and mine hydrogeological map; based on the multi-source information fusion analysis, when the roadway meets at least one of the following conditions, the corresponding water-inflow roadway is determined as a high-risk area and the curtain grouting construction is triggered:

[0014] 1) There is a risk of hydraulic connection: Through the coupling analysis of the mine production layout map and the mine hydrogeological map, it is determined that there is a risk of hydraulic connection in the roadway.

[0015] 2) There is a risk of surrounding rock deterioration: The surrounding rock of the roadway is dynamically deformed due to mining disturbance.

[0016] 3) There is a water-conducting structure: According to the underground water level monitoring data, geological section map and mine geological structure plan, fault fracture zones, fracture-intensive zones, collapse columns or poorly sealed boreholes are exposed.

[0017] Optionally, in Step 2, the materials used for the slurry retaining wall are high-strength concrete or steel slurry retaining wall.

[0018] The selection order of the blocked roadways should follow the principles of "first the source then the passage, first the independent then the connected, first the plane then the three-dimensional", specifically including:

[0019] 1) First the source then the passage: First analyze the water outlet source of the entire roadway system for blocking, and then consider blocking the roadways through which the water flows.

[0020] 2) First the independent then the connected: First block the independent roadways, and then block the connected roadways.

[0021] 3) First the plane then the three-dimensional: First block the roadways on the same plane, and then block the three-dimensional intersecting roadways.

[0022] Optionally, in Step 3, when filling and grouting the inclined roadway, first conduct graded grouting filling at the airtight wall at the bottom of the roadway; the first grouting is controlled at half of the height of the airtight wall, and the second graded grouting is carried out after waiting for coagulation for 12 hours.

[0023] Optionally, during the roadway filling in Step 3, it is necessary to add construction of roadway-through grouting holes and water drainage holes.

[0024] Optionally, in Step 3, the grouting material for underground roadway filling is slag Portland cement with a strength grade of P.S.B32.5, and a specific gravity of 1.5 - 1.6 t / m 3 is used for cement slurry grouting.

[0025] Optionally, in Step 3, after the roadway filling grouting reaches the designed grouting volume, the slurry returns from the return slurry port, and the grouting stops after the grouting pressure reaches 2 MPa.

[0026] Optionally, in Step 4, the drilling trajectory of the construction of branch holes is designed by combining "surface directional nearly horizontal branch hole groups" and "surface directional large oblique angle branch hole bundles" to achieve full coverage of the roadway space and the roof and floor rock strata in the treatment area;

[0027] The distance from the ground drilling hole orifice to the treatment boundary of the working face meets the requirements of the front displacement of the target in the horizontal directional well, and the position factor of the underground roadway is considered;

[0028] The direction of the drilling trajectory includes the main hole direction and the branch hole direction. The selection of the main hole direction ensures the smooth construction of other branch holes and covers the target area;

[0029] The drilling trajectory intersects obliquely with the dominant development direction of the fissures in the roof and floor of the roadway, and the drilling spacing is between 10 - 25 m.

[0030] Optionally, in Step 4, the final pressure of the high-pressure single-time grouting is not less than 6 MPa.

[0031] The present invention has the following advantages compared with the traditional anti-water inrush construction plan:

[0032] 1. Adopting a curtain grouting construction plan that integrates a water retaining wall and grouting, which not only increases the water-proof and water-blocking effect but also enhances the stability of the roadway.

[0033] 2. By filling cement slurry in the water retaining wall, the waterproof effect is more durable, and the occurrence of water inrush can be effectively prevented.

[0034] 3. Using the surface directional drilling technology to grout and reinforce the fissures in the surrounding rock of the roof and floor of the roadway. Compared with the traditional direct spraying, it can better fill the fissures and further enhance the waterproof effect.

[0035] 4. The construction method adopted in the present invention is simple and easy to implement, with low cost and wide application range, and can be used for various types of water inrush roadways.

[0036] 5. The anti-water inrush effect of the present invention is remarkable, which can effectively protect the lives of mining workers and the normal operation of mining equipment. Description of the Drawings

[0037] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0038] Figure 1 is the overall schematic diagram of the grouting and roadway blocking project actually used in the mine for the present invention;

[0039] Figure 2 is the design schematic diagram of the slurry retaining wall

[0040] Figure 3 is the schematic diagram of the staged grouting process in the inclined roadway for the present invention;

[0041] Figure 4 is the schematic diagram of the ground directional drilling structure for the present invention. Specific Embodiments

[0042] The present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0043] The construction method of curtain grouting for water-inflow roadway integrating slurry retaining wall and grouting of the present invention includes the following steps:

[0044] Step 1: According to the known geological data of the coal mine goaf and production area, analyze the mine production layout and hydrogeological conditions, and determine the water-inflow roadway that needs to carry out curtain grouting construction; in Step 1, the geological data includes the mine production layout map, underground water level monitoring data, stratigraphic structure profile and underground water flow direction map; in Step 1, the geological data includes the mine production layout map, underground water level monitoring data, geological profile, mine geological structure plan and mine hydrogeological map; based on multi-source information fusion analysis, when the roadway meets at least one of the following conditions, the corresponding water-inflow roadway is determined as a high-risk area and curtain grouting construction is triggered:

[0045] 1) There is a risk of hydraulic connection: through the coupling analysis of the mine production layout map and the mine hydrogeological map, it is determined that there is a risk of hydraulic connection in the roadway;

[0046] 2) There is a risk of surrounding rock deterioration: the surrounding rock of the roadway is dynamically deformed due to mining disturbance;

[0047] 3) There is a water-conducting structure: according to the underground water level monitoring data, geological profile and mine geological structure plan, fault fracture zones, fracture-intensive zones, subsidence columns or poorly sealed boreholes are exposed.

[0048] Step 2: Build a slurry retaining wall, which is set in the middle of the underground roadway or near the intersection of the main roadways, cutting off the connection between the lower coal roadway and the normal production roadway; the materials used for the slurry retaining wall are high-strength concrete or steel slurry retaining wall;

[0049] The selection sequence of blocked roadways should follow the principles of "first the source, then the passage, first independent, then connected, first planar, then three-dimensional", specifically including:

[0050] 1) First the source, then the passage: First analyze the water outflow source of the entire roadway system for blocking, and then consider blocking the roadways through which the water flows;

[0051] 2) First independent, then connected: First block the independent roadways, and then block the connected roadways;

[0052] 3) First planar, then three-dimensional: First block the roadways on the same plane, and then block the three-dimensional intersecting roadways.

[0053] Step 3: Fill the roadway space with slurry through underground grouting filling and grouting filling of the coal roadway exposed by the ground branch holes; In Step 3, when filling and grouting the inclined roadway, first conduct staged grouting filling at the closed wall at the bottom of the roadway; The first grouting is controlled at half of the height of the closed wall, and after waiting for 12 hours of setting, conduct the second staged grouting. During the roadway filling period, it is necessary to increase the construction of through-roadway grouting holes and water discharge holes. The underground roadway filling grouting material is slag Portland cement with a strength grade of P.S.B 32.5, and the specific gravity is selected as 1.5 - 1.6 t / m 3 Inject cement slurry for grouting. After the roadway filling grouting reaches the designed grouting volume, the slurry returns from the return slurry port, and stop grouting when the grouting pressure reaches 2 MPa.

[0054] Step 4: Construct branch holes to drill along the roof and floor of the roadway respectively, and use high-pressure grouting to reinforce the roof and floor, filling the loosened surrounding rock zone and the cracks in the roof and floor; The drilling trajectories of the constructed branch holes are designed by combining "ground directional near-horizontal branch hole groups" and "ground directional large-angle inclined branch hole bundles" to achieve full coverage of the roadway space and the roof and floor rock strata in the treatment area; The distance from the ground drilling hole mouth to the working face treatment boundary meets the requirements of the target displacement in front of the target for horizontal directional wells, and consider the factors of the underground roadway position; The directions of the drilling trajectories include the main hole direction and the branch hole direction. The selection of the main hole direction ensures that other branch holes can be constructed smoothly and cover the target area; The drilling trajectory intersects obliquely with the dominant development direction of the cracks in the roof and floor of the roadway, and the drilling spacing is between 10 - 25 m. The final pressure of a single high-pressure grouting is not less than 6 MPa.

[0055] Step 5: After the treatment work is completed, comprehensively analyze data such as drilling data, grouting data, roadway system, and geological conditions, circle out the weak areas of the engineering treatment, and construct inspection and reinforcement holes for the weak areas to check the treatment effect;

[0056] Step 6: Through the construction in Steps 2, 3, 4, and 5, the filled roadway and surrounding rock form an integral water-blocking curtain, cutting off the hydraulic connection between the in-use roadway and the water in the old goaf. Construct a hydrogeological observation hole in the production area to observe the water level change.

[0057] Main innovation points: The mine roadway applicable to the present invention is a roadway that will be filled with water in the future, and the roadway types are divided into three types: horizontal, uphill, and downhill, with different construction methods for different types of roadways. In order to prevent water leakage through the roof and floor fissures, the present invention sets branch holes to drill along the roof and floor of the roadway respectively, and performs high-pressure grouting to reinforce the roof and floor, fill the loosened circle of the surrounding rock and the roof and floor fissures, and improve the strength of the roof and floor; the curtain of the present invention mainly refers to the formation of a water-blocking whole by the reinforcement of the roof and floor and the filling of the roadway.

[0058] The grouting holes of the present invention are actual engineering grouting holes. The water discharge volume is increased through the water discharge holes to control the rapid rise of the water level after plugging. The main purposes of penetrating the roadway are, on the one hand, to perform grouting and filling treatment on the roadway, and on the other hand, to test the treatment effect of the previous roadway filling. The end positions of the water discharge holes are all within the water-conducting fissure zone of the goaf. In addition to controlling the rapid rise of the water level after plugging, the grouting effect can also be inspected. The design of the roadway penetration holes is in accordance with the design of "ground directional nearly horizontal branch borehole groups" and "ground directional large-angle branch borehole bundles".

[0059] Example 1:

[0060] The present invention will be described by taking the treatment of water inrush in the goaf roadway of the main coking coal mine as an example. The closure of adjacent coal mines has led to an increase in the water level of the old goaf water, bringing greater safety risks to the main coking coal mine. To solve this problem, the present invention adopts the following method:

[0061] Step 1: According to the known geological data of the coal mine goaf and production area, analyze the mine production layout and hydrogeological conditions, and determine the water inrush roadway that needs to be constructed with curtain grouting.

[0062] According to the recent mine water inrush observation ledger, the maximum water inrush volume of the main coking mine is 200m 3 / h, and the normal mine water inrush volume is 150m 3 / h. The water sources are mainly goaf water and roof water (including residual water in the shaft, dripping water, spraying water, and production water in the mining and excavation working faces), etc. The coal mines in the south, west, and southwest of the main coking mine have little impact on the water inrush volume of the main coking mine, while the coal mines in the north have a greater impact.

[0063] The Xin'an Coal Mine above the elevation of -50m in the northern part of the Main Coking Coal Mine is connected to the Shenjiazhuang Coal Mine, and the Shenjiazhuang Coal Mine at the elevation of -220m is connected to the Liuhe Coal Mine. At the elevation of -311m in the Liuhe Coal Mine, the minimum coal pillar between it and the Main Coking Coal Mine is 60m, and the water-conducting fissure zone is connected. After the Xin'an Coal Mine is closed, the Ordovician limestone water level will rise to a maximum of +130m. The waterproof (partition) coal pillar between some working faces in the 22nd mining area that has been mined in the Main Coking Coal Mine and the Liuhe Coal Mine is relatively thin and difficult to withstand the hydrostatic pressure when the water level rises to the Ordovician limestone water level after the Xin'an Coal Mine is closed. Therefore, the waterproof (partition) coal pillar will collapse, and the old goaf water in the Xin'an Coal Mine, Shenjiazhuang Coal Mine, and Liuhe Coal Mine will flow into the three main haulage headings in the 22nd mining area, and then pour into the -350m horizontal main haulage roadway where normal production is carried out. The drainage capacity of the Main Coking Coal Mine is insufficient, which will cause a shaft flooding accident.

[0064] To prevent the safety risks brought about by the closure of the Xin'an Coal Mine, it is necessary to cut off the water passage between the Main Coking Coal Mine and the Liuhe Coal Mine, isolate the hydraulic connection between the two mines, and provide guarantee for the safe production of the mine. Due to the poor stability of the waterproof (partition) coal pillar, it is easy to collapse during high-pressure grouting reinforcement, which makes the goafs in the 22nd mining area of the Main Coking Coal Mine and the Liuhe Coal Mine communicate with each other, causing secondary disasters and threatening the safe production of the mine. Therefore, it is not considered to build a curtain wall at the boundary waterproof (partition) coal pillar.

[0065] To sum up, this plan decides to block all the roadways connecting the 22nd mining area with other mining spaces, carry out grouting filling for all the roadways, and grout and reinforce the fissures between the roadways and the roof and floor of the roadways. The overall idea is to transform the entire treatment area into a solid curtain wall, completely cut off the hydraulic connection between the 22nd mining area and other mining spaces, and eliminate potential safety hazards ( Figure 1 、 Figure 2 ).

[0066] Step 2: Construct slurry retaining walls

[0067] A total of 14 slurry retaining walls (1#, 2#, 3-1#, 3-2#, 4#, 5#, 6#, 7-1#, 7-2#, 8#, 9#, 10#, 11#) are constructed in the Main Coking Coal Mine, and 13 grouting filling sections for roadways (section 1#, section 2#, section 3-1# to 3-2#, section 4#, section 5#, section 6#, section 7-1# to 7-2#, section 8#, the lower section of the track main haulage roadway to the lower section of the belt main haulage roadway in the 22nd mining area, the refuge chamber and substation section in the 22nd mining area, the lower section of the belt main haulage roadway in the 22nd mining area, section 7# to 10#, section 9# to 11#). The length of the roadway filling section is about 1343m. The filling sequence of the roadway sections is as follows:

[0068] Section 1# → Section 2# → Section 6# → Section 3-2# to 3-1# → Section 5# → Section 7-1# to 7-2# → Section 4# → Section 8# → The lower section of the track main haulage roadway to the lower section of the belt main haulage roadway in the 22nd mining area → The lower section of the belt main haulage roadway in the 22nd mining area → The refuge chamber and substation section in the 22nd mining area → The lower sublevel entry of 21141 → Section 7# to 10# → Section 9# to 11#Figure 2 )。The roadway length and the estimated filling volume are shown in Table 1

[0069] Table 1 Statistics of the filling roadway length and the estimated filling volume

[0070]

[0071]

[0072] Step 3: Through underground grouting filling and exposing the coal roadway grouting filling through the ground branch holes, conduct large-scale slurry filling for the roadway space;

[0073] The grouting material for the underground roadway filling is cement, which is slag Portland cement (strength grade is P.S.B 32.5), and the specific gravity of 1.5 - 1.6 t / m is selected 3 The cement slurry is used for grouting. Grouting filling is carried out for each roadway section of the No. 1, 2, 3, 4, 5, 6, 7, 8, the belt rise of the 22nd mining area, the track rise of the 22nd mining area, the refuge chamber of the 22nd mining area, the substation, and the No. 10 and 11. A total of 11,067 t of cement is injected.

[0074] When carrying out grouting filling for the roadway with a large slope, due to the low strength of the airtight wall, in order to prevent the wall from being washed out or crushed during the roadway grouting filling, first conduct staged grouting filling at the airtight wall at the bottom of the roadway. The first grouting is controlled at half of the height of the airtight wall, and after waiting for setting for 12 h, then conduct the second staged grouting ( Figure 3 ).

[0075] Step 4: Construct branch holes to drill along the roof and floor of the roadway respectively, conduct high-pressure grouting to reinforce the roof and floor, fill the loose circle of the surrounding rock and the fissures in the roof and floor, and improve the strength of the roof and floor.

[0076] A total of 10 treatment holes are actually constructed in the Z2 hole group, and the footage of the third open treatment section is 3,338.16 m ( Figure 4 ). The Z2-1 to Z2-5 holes are mainly aimed at treating the space of the rise roadway and the roof fissures in the 22nd mining area, and the Z2-6 hole is aimed at treating the floor fissures of the belt rise roadway in the 22nd mining area. The subsequent supplementary boreholes are mainly aimed at inspecting and supplementing the reinforcement of the situation of the pre-construction on-site and underground filling and reinforcement treatment of the space of the three rise roadways, the loose circle of the surrounding rock, and the fissures in the roof and floor in the 22nd mining area ( Figure 1 ). The Z2 hole group has been grouted 22 times in total, with a total of 24,128 t of cement injected and 151 t of fly ash injected. The final pressure of each grouting is not less than 6 MPa (except for the case of slurry leakage in the roadway).

[0077] Step 5: After the treatment work is completed, comprehensively analyze the drilling data, grouting data, roadway system, geological conditions and other data, circle out the weak areas of the engineering treatment, and construct inspection and reinforcement holes for the weak areas to check the treatment effect.

[0078] The unit water absorption rate of the Z2 borehole group was between 1.19×10 -3 ~7.66×10 -3 L / min·m·m before treatment, with an average of 2.67×10 -3 L / min·m·m. After treatment, the unit water absorption rate was between 9.21×10 -5 ~2.78×10 -4 L / min·m·m, with an average of 1.65×10 -4 L / min·m·m. The reduction ratio of the unit water absorption rate after treatment was in the range of 86.58% - 96.36%, with an average of 92.74%, indicating that the effect of this grouting transformation was significant.

[0079] The entire Z2 borehole group carried out grouting reinforcement on the space of the three up - hill roadways in the 22nd mining area, the loose circle of the roadway surrounding rock, and the roof - floor fissures. When some branch holes actually drilled near the previously backfilled roadways during construction, cement stone bodies were found. Subsequently, the Z2 - 10 inspection and reinforcement holes were constructed, and penetration inspections were carried out on the endless - rope refuge chamber, the return - air track connection roadway in the 22nd mining area, and the return - air roadway at the - 350 level respectively. Cement stone bodies were found at the penetration positions, and there was no loss of drilling fluid. The details are shown in the table. It shows that after the previous underground roadway backfilling and ground - level hole high - pressure grouting treatment, the underground roadway space controlled by each slurry - retaining wall was fully filled and sealed; the space of the three up - hill roadways in the 22nd mining area, the loose circle of the roadway surrounding rock, and the roof - floor fissures were effectively filled and reinforced.

[0080] Step 6: Through the construction of Step 2, Step 3, Step 4, and Step 5, the filled roadways and surrounding rocks form an integral water - proof curtain, cutting off the hydraulic connection between the in - use roadway and the old - goaf water. Hydrological observation holes are constructed in the production area to observe the water - level change.

[0081] The present invention effectively blocks the potential connection between the old - goaf water and the in - use roadway. After the treatment, the water inflow is less than 5m 3 / h, and the effect of the curtain - blocking roadway treatment is good, eliminating the potential water - hazard hidden danger and completing the governance objectives and tasks of the project.

[0082] The above is only the specific implementation manner of the present invention, but the present invention is not limited to the above - mentioned implementation manner. Without departing from the design concept and principles of the present invention, all kinds of modifications, improvements, and changes of the present invention should be included within the protection scope of the present invention.

Claims

1. A curtain grouting construction method for a water-gushing tunnel integrating a retaining wall and grouting, characterized in that: The steps include: Step 1: Analyze the mine production layout and hydrogeological conditions based on the known geological data of the coal mine goaf and production area, and determine the water-gushing tunnels that need curtain grouting construction; Step 2: Build a slurry retaining wall in the middle of the underground tunnel or near the intersection of the main tunnel to cut off the connection between the lower coal tunnel and the normal production tunnel; Step 3: Fill the tunnel space with slurry through underground grouting and surface branch hole grouting of coal tunnels; Step 4: Drill branch holes along the top and bottom plates of the tunnel respectively, reinforce the top and bottom plates with high pressure grouting, and fill the loosened zone of surrounding rock and the cracks in the top and bottom plates; Step 5: After the treatment work is completed, check the reinforcement holes in the weak areas and check the treatment effect; Step six: through the construction of steps two, three, four and five, the filled tunnel and surrounding rock form an integral water-proof curtain.

2. The curtain grouting construction method for a water-gushing tunnel integrating a retaining wall and grouting according to claim 1 is characterized in that: In step 1, the geological data include mine production layout map, groundwater level monitoring data, geological profile map, mine geological structure plan map and mine hydrogeological map; based on multi-source information fusion analysis, when the tunnel meets at least one of the following conditions, the corresponding water-gushing tunnel is determined to be a high-risk area and the curtain grouting construction is triggered: 1) There is a risk of hydraulic penetration: Through the coupling analysis of the mine production layout map and the mine hydrogeological map, it is determined that there is a risk of hydraulic penetration in the tunnel; 2) Risk of surrounding rock deterioration: The surrounding rock of the roadway is dynamically deformed due to mining disturbance; 3) Existence of water-conducting structures: Based on groundwater level monitoring data, geological profiles and mine geological structure plans, fault fracture zones, fissure-intensive zones, collapse columns or poorly sealed boreholes are exposed.

3. The curtain grouting construction method for a water-gushing tunnel integrating a water retaining wall and grouting according to claim 1 or 2, characterized in that: In step 2, the material used for the slurry retaining wall is high-strength concrete or steel slurry retaining wall; The order of selecting blocked lanes should follow the principle of "source first, then channel, independence first, then connection, plane first, then three-dimensional", including: 1) Source first, then channel: First analyze the water source of the entire tunnel system and block it, then consider the tunnels through which the water flows and block them; 2) First independent and then connected: first block the independent lanes, then block the connected lanes; 3) First the plane, then the three-dimensional: first block the alleys on the same plane, then block the alleys that intersect in the three-dimensional space.

4. The curtain grouting construction method for a water-gushing tunnel integrating a retaining wall and grouting according to claim 1 or 2, characterized in that: In step three, when filling and grouting the inclined tunnel, firstly, the closed wall at the bottom of the tunnel is filled with grouting in batches; the first grouting is controlled at half the height of the closed wall, and the second grouting is carried out after waiting for 12 hours.

5. The curtain grouting construction method for a water-gushing tunnel integrating a water retaining wall and grouting according to claim 1 or 2, characterized in that: In step three, additional grouting holes and drainage holes need to be constructed during tunnel filling.

6. The curtain grouting construction method for a water-gushing tunnel integrating a water retaining wall and grouting according to claim 1 or 2, characterized in that: In step three, the underground tunnel filling grouting material is slag silicate cement with a strength grade of PSB32.5, and cement slurry with a specific gravity of 1.5 to 1.6 t / m3 is selected for grouting.

7. The curtain grouting construction method for a water-gushing tunnel integrating a water retaining wall and grouting according to claim 1 or 2, characterized in that: In step three, after the tunnel filling grouting reaches the designed grouting volume, grouting is returned from the return port, and grouting is stopped after the grouting pressure reaches 2MPa.

8. The curtain grouting construction method for a water-gushing tunnel integrating a water retaining wall and grouting according to claim 1 or 2, characterized in that: In step 4, the drilling trajectory of the construction branch hole adopts the combination design of "ground directional near-horizontal branch drilling group" and "ground directional high-angle branch drilling bundle" to achieve full coverage of the tunnel space and the top and bottom rock layers of the tunnel in the treatment area; The distance from the surface drilling hole to the working face treatment boundary meets the requirements of horizontal directional wells for target displacement, and takes into account the location factors of the underground tunnel; The orientation of the drilling trajectory includes the main hole orientation and the branch hole orientation. The selection of the main hole orientation ensures that other branch holes can be constructed smoothly and cover the target area; The drilling trajectory is oblique to the dominant development orientation of cracks in the roof and floor of the tunnel, and the drilling spacing is between 10 and 25m.

9. The curtain grouting construction method for a water-gushing tunnel integrating a water retaining wall and grouting according to claim 1 or 2, characterized in that: In step 4, the final pressure of high-pressure single grouting is not less than 6MPa.

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