Pressure relief-water guide composite function drilling method for water-rich roadway in dynamic pressure disturbance area
By constructing composite functional boreholes in water-rich roadways within dynamic pressure disturbance zones and combining them with anchor bolt support and grouting reinforcement, the problems of pressure relief and drainage of the surrounding rock in the roadways were solved, improving roadway stability and reducing surrounding rock deterioration.
Patent Information
- Application Number
- CN202511845996.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-02-06
AI Technical Summary
In water-rich roadways within dynamic pressure disturbance zones, existing roadway rock decompression and drainage technologies are difficult to effectively combine, leading to repeated construction. Furthermore, the roadway rock is susceptible to deterioration due to mine water and seepage water pressure, affecting its stability.
A composite functional drilling method was adopted, which included drilling composite functional boreholes in the stress concentration area of the roadway, laying metal water pipes and filling them with energy-absorbing fillers, and combining them with anchor bolt support and grouting reinforcement to form an integrated pressure relief and water guiding structure. The length and diameter of the borehole section were determined by numerical simulation.
It effectively relieves pressure and drains water from water-rich roadways in dynamic pressure disturbance zones, reduces surrounding rock degradation, improves roadway stability, and avoids the cost accumulation of constructing separate water guide holes and pressure relief holes.
Smart Images
Figure CN121473877A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of water control and prevention technology for surrounding rock in water-rich roadways, and in particular to a drilling method for a combined function of pressure relief and water diversion in water-rich roadways in dynamic pressure disturbance zones. Background Technology
[0002] As coal mining shifts to deeper levels, becoming the new normal for ensuring my country's energy needs, the surrounding rock of roadways is affected by complex mining stresses and seepage water pressure. Traditional support structures are insufficient to effectively control roadway stability. Furthermore, under the deteriorating effects of mine water and seepage water pressure, the surrounding rock often exhibits softening, expansion, and disintegration of the coal and rock mass. For water-rich roadways in dynamic pressure disturbance zones, existing roadway surrounding rock decompression and drainage technologies have not been combined and simplified for practical application, often resulting in repetitive construction. Therefore, it is necessary to design a composite drilling method for decompression and water diversion in water-rich roadways in dynamic pressure disturbance zones to achieve both decompression and drainage of the surrounding rock. Summary of the Invention
[0003] The purpose of this invention is to provide a drilling method with combined depressurization and water diversion functions for water-rich roadways in dynamic pressure disturbance zones, so as to effectively depressurize water-rich roadways in dynamic pressure disturbance zones, reduce the deteriorating effect of roof and floor water seepage on the surrounding rock of the roadway, and improve the stability of the surrounding rock of water-rich roadways in dynamic pressure disturbance zones.
[0004] To achieve the above objectives, the present invention provides the following solution: A drilling method for a water-rich roadway in a dynamic pressure disturbance zone that combines pressure relief and water diversion functions includes: Obtain hydrogeological information of water-rich tunnels in the target dynamic pressure disturbance zone; Support is provided for the water-rich roadway in the target dynamic pressure disturbance zone. Based on the hydrogeological information and the mechanical parameters of the surrounding rock of the roadway, numerical simulation is performed on the distribution of stress field, seepage field, displacement field and fracture field of the water-rich roadway in the target dynamic pressure disturbance zone after support, and the stress concentration area of the roadway is determined. After constructing composite function boreholes in the stress concentration area of the roadway, metal water guide pipes are arranged in the boreholes, and energy-absorbing filling bodies are filled in the shallow small-diameter pressure relief section. Based on the key water inrush and water leakage situation of the water-rich roadway in the target dynamic pressure disturbance zone and the degree of development of surrounding rock fissures, inclined long water-conducting boreholes are opened at the top and bottom corners of the roadway.
[0005] Optionally, the hydrogeological information includes: the pattern of mine pressure manifestation, the source of water in the roadway, and the roadway deformation.
[0006] Optionally, the support for the water-rich roadway in the target dynamic pressure disturbance zone includes: supporting the water-rich roadway in the target dynamic pressure disturbance zone with long grouting anchor cables and anchor bolts, and performing grouting reinforcement and roadway surface spraying.
[0007] Optionally, drilling composite functional boreholes in the stress concentration area of the roadway includes: Based on the distribution range of stress concentration area and anchorage area in the water-rich roadway of the target dynamic pressure disturbance zone, determine the lengths of the shallow small-diameter pressure relief section, the middle large-diameter pressure relief section, and the deep small-diameter water guiding section. Among them, the orifice length of the shallow small-diameter pressure relief section L 1. In the roadway anchorage area L a Inner; Length of the large-diameter pressure relief section in the middle L 2. In the anchorage area L a To the stress disturbance zone R s Between; deep small-diameter water guiding section L 3. Extend 5-10m from the outer side of the central decompression section into the depth of the surrounding rock.
[0008] Optionally, filling the shallow small-diameter pressure relief section with energy-absorbing filler includes pumping the energy-absorbing filler to the shallow small-diameter pressure relief section by means of a pump.
[0009] Optionally, the grouting reinforcement material is a water-repellent grouting material.
[0010] Optionally, the energy-absorbing filler is a mixture of coal-based solid waste and rubber filler or a coal-based solid waste foam filler.
[0011] Optionally, arranging a metal water guide pipe in the borehole includes: arranging a metal water guide pipe in the middle of the composite functional borehole, the metal water guide pipe extending from a shallow small-diameter pressure relief section to a deep small-diameter water guide section.
[0012] Optionally, the diameter of the composite functional borehole in the shallow small-diameter pressure relief section and the middle large-diameter pressure relief section is larger than that of the metal water guide pipe, and the diameter of the deep small-diameter water guide section is calculated based on the stress of the surrounding rock in the roadway.
[0013] Optionally, the length of the energy-absorbing filling body should be less than the length of the shallow small-diameter pressure relief section, and a grout stop plug should be installed at the end inside the shallow small-diameter pressure relief section to prevent the energy-absorbing filling body from overflowing from the shallow small-diameter pressure relief section to the middle large-diameter pressure relief section.
[0014] The beneficial effects of this invention are as follows: This invention combines existing roadway surrounding rock support technologies, including anchor bolt support, surrounding rock grouting, and surface spraying, to achieve preliminary sealing and reinforcement of roadway surrounding rock fissures. By adding an integrated pressure relief and water diversion borehole, on the one hand, it can improve the energy environment of shallow surrounding rock, reduce the area of energy rise in the roadway surrounding rock, and achieve precise pressure relief control in the dynamic pressure disturbance zone. The deep water diversion section borehole can effectively reduce the deep water pressure in the surrounding rock, reducing the degree of deterioration of the roadway surrounding rock caused by mine water seepage. On the other hand, a single borehole serves multiple purposes; filling the shallow, small-diameter borehole with energy-absorbing filler can prevent the borehole wall from softening and collapsing upon contact with water, maintaining pressure relief efficiency. This invention upgrades traditional pressure relief boreholes from simple stress release to a stress-seepage combined regulation carrier, avoiding the cost accumulation of separately constructed water diversion / pressure relief boreholes, and improving the overall stability of the roadway. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the borehole layout method for the integrated pressure relief and water diversion function in the water-rich roadway of the dynamic pressure disturbance zone according to an embodiment of the present invention. Figure 2 This is a diagram of the integrated pressure relief and water guiding composite borehole structure of an embodiment of the present invention. Figure 3 This is a flowchart of a drilling method for a water-rich roadway with pressure relief and water diversion functions in a dynamic pressure disturbance zone, according to an embodiment of the present invention. Among them, 1-Water-rich roadway in the target dynamic pressure disturbance zone, 2-Long grouting anchor cable, 3-Anchor rod, 4-Grouting material, 5-Spraying material, 6-Composite functional borehole, 7-Shallow small diameter pressure relief section, 8-Middle large diameter pressure relief section, 9-Deep small diameter water guiding section, 10-Metal water guiding pipe, 11-Energy-absorbing filling body, 12-Grouting plug, 13-Inclined long water guiding borehole; Detailed Implementation
[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0019] like Figure 3 As shown in the figure, this embodiment proposes a drilling method with combined functions of pressure relief and water diversion in water-rich roadways in dynamic pressure disturbance zones, including: The hydrogeological information of the water-rich roadway 1 in the target dynamic pressure disturbance zone of this embodiment is obtained, including the mining pressure manifestation pattern, the source of water in the roadway, and the roadway deformation. Among them, the mining pressure manifestation pattern affects the row spacing of the composite function boreholes, the source of water in the roadway determines the arrangement position of the composite function boreholes on both sides of the roadway wall, that is, the composite function boreholes should be arranged on the side of the roadway wall closer to the source of water in the roadway, and the roadway deformation affects the support strength.
[0020] To support the water-rich roadway 1 in the target dynamic pressure disturbance zone, the first step is to install long grouting anchor cables 2 and anchor bolts 3. 22×8000mm 28×2300mm, grouting material 4 is selected according to the development of cracks in the surrounding rock of the roadway. Ultra-fine cement-based grouting material of ≤10μm or nano-inorganic-organic composite water-driving grouting material is selected for surrounding rock reinforcement. High-performance spraying material 5 is used to seal cracks and prevent grout leakage.
[0021] Based on hydrogeological information and the mechanical parameters of the surrounding rock of the roadway, numerical simulations were performed on the distribution of stress field, seepage field, displacement field and fracture field of the water-rich roadway after support in the target dynamic pressure disturbance area. Combined with the field observation data of the roadway after support, the stress concentration area and stress disturbance area of the roadway were determined. In some embodiments, the stress concentration area is defined as the area where the stress value exceeds 2 to 5 times the original rock stress, with the original rock stress as the benchmark. This stress concentration area is the main area of action of the long grouting anchor cable 2 and anchor rod 3 support, deep and shallow hole grouting and surface high-performance spraying material.
[0022] In the stress concentration area of the roadway, a composite functional borehole 6 is drilled, and an energy-absorbing filling body 11 is filled in the shallow small-diameter pressure relief section.
[0023] Furthermore, based on the size of the surrounding rock anchoring area of the roadway, the drilling lengths of the shallow small-diameter pressure relief section 7 and the middle large-diameter pressure relief section 8 are determined. The length of the shallow, small-diameter pressure relief section 7 L 1. In the roadway anchorage area L a Inside; 8 large-diameter pressure relief sections in the middle, length of which... L 2 is the anchorage zone L a To the stress disturbance zone R s Length between; Length of deep small-diameter water guiding section 9 L3. Extend 5-10m from the outer side of the central decompression section into the depth of the surrounding rock. 22×8000mm, considering the grouting diffusion effect, anchorage zone L a If we consider it to be 10m, then the length of the shallow, small-diameter pressure relief section 7 of the composite function borehole is... L 1 is 10m, and the large-diameter pressure relief section 8 in the middle is arranged between the anchorage zone and the stress disturbance zone (satisfying) ), hole length L 2 is 5~15m, while the length of the deep small-diameter water guiding section 9 is... L 3 is 10m. These three sections of borehole with different diameters together form a composite borehole 6 that integrates pressure relief and water guiding. Among them, the shallow small-diameter pressure relief section 7 has both water guiding and pressure relief effects, the middle large-diameter pressure relief section 8 undertakes the main pressure relief function, and the deep small-diameter water guiding section 9 can guide water sources that cannot be dispersed or blocked.
[0024] Furthermore, a grout stopper 12 is installed at the inner end of the shallow small-diameter pressure relief section 7. Then, coal-based solid waste and rubber mixed filling material or coal-based solid waste foam filling material is pumped to the shallow small-diameter pressure relief section 7. The grout stopper 12 can effectively prevent the energy-absorbing filling material 11 from flowing into the middle large-diameter pressure relief section 8 before it solidifies. In this embodiment, the advantageous ratio of the coal-based solid waste foam filling material is a foaming agent dilution concentration of 20 times, a foam stabilizer dosage of 1%, a water-ash ratio of 0.5, a foaming agent yield of 1%, and a gypsum dosage of 7%. The advantageous ratio of the coal-based solid waste and rubber mixed filling material is a ratio of cement:fly ash:rubber particles:coal gangue:water = 1:2:1:4:2, with a mass concentration of 80%. These two types of energy-absorbing filling materials can effectively prevent the collapse of shallow small-diameter boreholes caused by mining stress and water softening.
[0025] Furthermore, a metal water guide pipe 10 is arranged in the middle of the composite functional borehole. The metal water guide pipe runs through the entire length of the composite functional borehole. In this embodiment, the preferred diameter of the metal water guide pipe is 20mm. In addition, the energy-absorbing filling body of the aforementioned shallow small-diameter pressure relief section also serves to fix the metal water guide pipe.
[0026] In some embodiments, the borehole diameter is determined based on the size of the stress concentration region.
[0027] Specifically, the diameter of the shallow, small-diameter pressure relief section 7 of the composite-function borehole is slightly larger than the diameter of the metal water guide pipe 10, with a reasonable range of 22~30mm. The reasonable diameter range of the deep, small-diameter water guide section 9 is also 22~30mm. The reasonable radius R of the middle, large-diameter pressure relief section 8 is... c You can refer to the following calculation method: ; in, RThe reference radius for drilling is... a , b and c The characteristic parameter for calculating the borehole pressure relief diameter; 'a' is the angle between the borehole and the horizontal stress; The original rock stress of the surrounding rock is given in MPa. The compressive strength is expressed in MPa. K p is the stress concentration factor.
[0028] In some embodiments, the dominant orifice diameter of the central large-diameter pressure relief section 8 is 300~500mm.
[0029] Furthermore, the method also includes: according to the key water inrush and water leakage situation of the water-rich roadway in the target dynamic pressure disturbance area and the degree of development of surrounding rock fissures, diagonal long water-conducting boreholes 13 are opened at the top and bottom corners of the roadway sidewall.
[0030] The following is a specific example of the water-rich roadway in the dynamic pressure disturbance zone of a certain mine. The specific implementation steps are as follows: (1) The hydrogeological conditions of the water-rich dynamic pressure roadway were obtained through on-site investigation, including the manifestation of mine pressure, the source of water in the roadway, and the deformation of the roadway. The target roadway cross-section is 5000×3600mm. As the working face advances, the maximum convergence of the two sides of the roadway in the advanced section is 840mm, and the deformation of the roof and floor is more than 350mm. The roadway as a whole exhibits rheological properties. The water sources include sandstone fissure water in the roof and floor, borehole water, and limestone water in the floor. The average inflow of sandstone fissure water in the roof and floor is 3.5m. 3 / h, the confined aquifer of limestone at the bottom plate is 26m away from the working face, and the water pressure of the limestone at the bottom plate is 3.4~4MPa.
[0031] (2) Composite function borehole layout as follows Figures 1-2 As shown, preliminary support and reinforcement were carried out on the tunnel, including... The 22×8200mm long grouting anchor cable 2 and GM22 / 2800-490mm anchor bolt 3 are used for support, and deep and shallow hole grouting and high-performance spraying of the roadway surface are carried out using nano-inorganic-organic composite grouting material.
[0032] (3) Obtain the mechanical parameters of the surrounding rock of the roadway by on-site sampling. Based on the finite-discrete element numerical simulation method, perform numerical simulation of the stress field, seepage field, displacement field and fracture field distribution of the target roadway after preliminary support. The shallow stress of the roadway is fully released, forming a stress reduction zone. Energy accumulation zones are generated at the shoulder and bottom corners of the roadway in the top and bottom plate areas, and a high stress concentration area is formed in the middle of the roadway sidewall at a depth of 7-15m.
[0033] (4) The length of the pressure relief section L1 of the shallow small-diameter borehole of the composite function borehole is 8m, the length of the pressure relief section L2 of the middle large-diameter borehole is 10m, and the length of the pressure relief section L3 of the deep small-diameter borehole is 5m. The diameter of the pressure relief section of the shallow small-diameter borehole is 25mm, and the diameter of the pressure relief section of the deep small-diameter borehole is 25mm.
[0034] (5) A 20m long and 20mm diameter metal water pipe is arranged in the middle of the composite function borehole. The two ends are respectively located in the shallow small diameter borehole pressure relief section and the deep small diameter borehole pressure relief section. A grout stop plug is installed 7m away from the outside of the metal water pipe. On site, coal-based solid waste foam filling material is prepared according to the following ratio: foaming agent dilution concentration of 20 times, foam stabilizer dosage of 1%, water-cement ratio of 0.5, foaming agent production of 1%, and gypsum dosage of 7%. The material is injected into the gap between the shallow small diameter pressure relief section and the metal water pipe, which serves to maintain the pressure relief effect and fix the metal water pipe.
[0035] (6) In addition, the pressure relief section of the large-diameter borehole in the middle is calculated according to the following method. The reasonable borehole diameter is 350mm~450mm.
[0036] ; ; ; ; ; in, , The original rock stress of the surrounding rock is given in MPa. It is the average unit weight of the overlying rock strata, MN / m 3 ; h The thickness of the overlying rock strata is in meters (m). The lateral pressure coefficient, R Let be the reference radius for drilling, in meters (m). r The distance from the equivalent borehole to the borehole center is expressed in meters (m). The angle between the borehole and the horizontal stress, in °; c Cohesion, MPa; The internal friction angle of the surrounding rock is °; The radial stress of the coal seam surrounding the borehole, in MPa; The circumferential stress of the coal seam surrounding the borehole is MPa; the length of the closed main crack in the fracture zone is 2n, m. The angle between the closed main crack in the fracture zone and the radial direction of the borehole is °; The coefficient of friction of the crack surface; This is related to the propagation of airfoil cracks, with a reference value between 55 and 82.
[0037] (7) Based on the subsequent water inrush and water outburst situation in the roadway, diagonal long water guide boreholes 13 with a diameter of 50 mm and a length of 10 m are opened at the top and bottom corners of the roadway sidewall in the key area of the target roadway.
[0038] In summary, this embodiment first obtains the manifestation law of mine pressure in water-rich roadways in dynamic pressure zones and the source of water inflow. After sidewall and roof expansion, long grouting anchor cables + short hollow anchor bolts are used for support, shallow surrounding rock grouting reinforcement is performed, and high-performance spraying is applied to the roadway surface. The stress field, seepage field, displacement field, and fracture field distribution of the target roadway after initial support are numerically simulated using the finite-discrete element numerical simulation method. Composite functional boreholes are drilled in the stress concentration areas of the roadway sidewalls. These composite functional boreholes are divided into shallow pressure relief sections, middle pressure relief sections, and deep water-conducting sections with different diameters. Energy-absorbing filling materials are used to fill the shallow and middle pressure relief sections. Inclined small-diameter long water-conducting boreholes are drilled at the top and bottom corners of the roadway sidewalls in key water seepage and inrush areas. This method can effectively relieve pressure in water-rich roadways in dynamic pressure disturbance zones, reduce the deteriorating effect of roof and floor water seepage on the surrounding rock, and improve the stability of the surrounding rock in water-rich roadways in dynamic pressure disturbance zones.
[0039] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims
1. A drilling method for a combined pressure relief and water guiding function in a water-rich roadway in a dynamic pressure disturbance zone, characterized in that, include: Obtain hydrogeological information of water-rich tunnels in the target dynamic pressure disturbance zone; Support is provided for the water-rich roadway in the target dynamic pressure disturbance zone. Based on the hydrogeological information and the mechanical parameters of the surrounding rock of the roadway, numerical simulation is performed on the distribution of stress field, seepage field, displacement field and fracture field of the water-rich roadway in the target dynamic pressure disturbance zone after support, and the stress concentration area of the roadway is determined. After constructing composite function boreholes in the stress concentration area of the roadway, metal water guide pipes are arranged in the boreholes, and energy-absorbing filling bodies are filled in the shallow small-diameter pressure relief section. Based on the key water inrush and water leakage situation of the water-rich roadway in the target dynamic pressure disturbance zone and the degree of development of surrounding rock fissures, inclined long water-conducting boreholes are opened at the top and bottom corners of the roadway.
2. The drilling method for pressure relief and water diversion composite functions in water-rich roadways in dynamic pressure disturbance zones according to claim 1, characterized in that, The hydrogeological information includes: the pattern of mine pressure manifestation, the source of water in the tunnel, and the tunnel deformation.
3. The drilling method for pressure relief and water diversion composite functions in water-rich roadways in dynamic pressure disturbance zones according to claim 1, characterized in that, The support for the water-rich roadway in the target dynamic pressure disturbance zone includes: supporting the water-rich roadway in the target dynamic pressure disturbance zone with long grouting anchor cables and anchor bolts, and carrying out grouting reinforcement and roadway surface spraying.
4. The drilling method for pressure relief and water diversion composite functions in water-rich roadways in dynamic pressure disturbance zones according to claim 1, characterized in that, The construction of composite functional boreholes in the stress concentration area of the roadway includes: Based on the distribution range of stress concentration area and anchorage area in the water-rich roadway of the target dynamic pressure disturbance zone, determine the lengths of the shallow small-diameter pressure relief section, the middle large-diameter pressure relief section, and the deep small-diameter water guiding section. Among them, the orifice length of the shallow small-diameter pressure relief section L 1. In the roadway anchorage area L a Inner; Length of the large-diameter pressure relief section in the middle L 2. In the anchorage area L a To the stress disturbance zone R s Between; deep small-diameter water guiding section L 3. Extend 5-10m from the outer side of the central decompression section into the depth of the surrounding rock.
5. The drilling method for pressure relief and water diversion composite functions in water-rich roadways in dynamic pressure disturbance zones according to claim 4, characterized in that, Filling the shallow, small-diameter pressure relief section with energy-absorbing filler includes pumping the energy-absorbing filler to the shallow, small-diameter pressure relief section by means of a pump.
6. The drilling method for pressure relief and water diversion composite functions in water-rich roadways in dynamic pressure disturbance zones according to claim 3, characterized in that, The grouting reinforcement material is a water-repellent grouting material.
7. The drilling method for pressure relief and water diversion composite functions in water-rich roadways in dynamic pressure disturbance zones according to claim 5, characterized in that, The energy-absorbing filler is a mixture of coal-based solid waste and rubber filler or a coal-based solid waste foam filler.
8. The drilling method for pressure relief and water diversion composite functions in water-rich roadways in dynamic pressure disturbance zones according to claim 5, characterized in that, Arranging a metal water guide pipe inside the borehole includes: arranging a metal water guide pipe in the middle of the multifunctional borehole, the metal water guide pipe extending from a shallow small-diameter pressure relief section to a deep small-diameter water guide section.
9. The drilling method for pressure relief and water diversion composite functions in water-rich roadways in dynamic pressure disturbance zones according to claim 8, characterized in that, The diameter of the composite functional borehole in the shallow small-diameter pressure relief section and the middle large-diameter pressure relief section is larger than that of the metal water guide pipe, and the diameter of the deep small-diameter water guide section is calculated based on the stress of the surrounding rock in the roadway.
10. The drilling method for pressure relief and water diversion composite functions in water-rich roadways in dynamic pressure disturbance zones according to claim 8, characterized in that, The length of the energy-absorbing filling material should be less than the length of the shallow small-diameter pressure relief section, and a grout stop plug should be installed at the end inside the shallow small-diameter pressure relief section to prevent the energy-absorbing filling material from overflowing from the shallow small-diameter pressure relief section to the middle large-diameter pressure relief section.