CN-117072201-B - Method for treating water in inclined shaft of coal mine

CN117072201BCN 117072201 BCN117072201 BCN 117072201BCN-117072201-B

Abstract

The invention discloses a method for treating water in a coal mine inclined shaft, which determines the spatial position of water treatment in the coal mine inclined shaft through theoretical calculation, adopts directional drilling, segmentation, sequencing and forward grouting methods parallel to the inclined shaft to form annular curtain bodies around the inclined shaft, increases the diffusion range and diffusion efficiency of slurry in a directional drainage mode, and reduces the water inflow of the inclined shaft of a strong water-rich strong-replenishment loose layer coal mine. The invention constructs a curtain water interception seepage-proofing system of the annular space of the inclined shaft of the coal mine, realizes the comprehensive water blocking method of the inclined shaft of the coal mine in the annular space of the strong water-rich strong supply stratum, is suitable for a loose layer with strong water and a stratum with developed pore gaps, solves the problem that the existing inclined shaft treatment method can not simultaneously meet the loose layer and the stratum, and greatly improves the water leakage treatment level and the treatment effect of the inclined shaft of the strong water-rich strong supply stratum.

Inventors

WANG HAI
YANG ZHIBIN
WANG SHIDONG
ZHU KAIPENG
LI TAO

Assignees

中煤科工西安研究院(集团)有限公司

Dates

Publication Date: 20260508
Application Date: 20230821

Claims (9)

1. The method for treating the water in the shaft of the inclined shaft of the coal mine is characterized by comprising the following steps of: step 1, detecting Jiang Fushui strong supply geological hydrogeological conditions of a loose layer coal mine inclined shaft engineering, dividing the layering position of rock and soil around the inclined shaft, and finding out the tunneling section height of the inclined shaft The tunneling section width B of the inclined shaft is measured, the mechanical parameter cohesive force c and the internal friction angle phi of rock and soil mass around the inclined shaft are measured, the number n of seepage points of the inclined shaft and the water level height of loose layers around the inclined shaft are measured ; Step2, calculating the theoretical radius of the loose coil of the surrounding rock of the inclined shaft ; Wherein R b Management device is the theoretical radius of the loose ring of surrounding rock of the inclined shaft, and m; Equivalent radius of the tunneling section of the inclined shaft, m, ; H Cartridge , the tunneling section height of the inclined shaft, m; b, the tunneling section width of the inclined shaft, m; P-inclined shaft wellbore surrounding rock initial ground stress, MPa, p=γh Burying process ; Gamma-weight of rock mass surrounding the inclined shaft, N/m 3 ; H Burying process -the buried depth of the inclined shaft, m; p 1 -primary support reaction force of inclined shaft, MPa; c-the cohesive force of surrounding rocks of the inclined shaft and the shaft, and MPa; phi-friction angle in surrounding rock of inclined shaft; step 3, calculating theoretical radius of plastic region of rock-soil body of inclined shaft ; Wherein: Equivalent radius of the tunneling section of the inclined shaft, m, ; The stress of surrounding rock of the inclined shaft, MPa, ; -Inclined shaft wellbore support reaction force MPa; c-the cohesive force of rock and soil mass around the inclined shaft, and MPa; phi-internal friction angle of rock-soil body around inclined shaft; The gravity of the overlying rock soil body on the gamma-inclined shaft, kN/m 3 ; -vertical distance from top of inclined shaft to surface, m; step 4, determining the theoretical radius of the surrounding rock loose coil of the inclined shaft well bore The theoretical radius of the plastic region of the rock-soil body of the inclined shaft is the boundary range of the pore crack development region outside the shaft Boundary ranges for the pore gap development outer boundary region; step 5, arranging a construction water level and water quality on-line monitoring hole outside the inclined shaft, and arranging a full-automatic monitoring system in the water level and water quality on-line monitoring hole to dynamically monitor underground water level, water quality and flow field parameters around the inclined shaft in real time; Step 6, directional drilling holes are distributed in the development area of the pore gap at the outer side of the inclined shaft along the inclined direction of the shaft, the directional drilling holes are parallel to the wall of the outer side of the inclined shaft, the directional drilling holes are constructed in a sequential and sectional mode, the track of the directional drilling holes is in the range of the boundary between the inclined shaft and the development area of the pore gap at the outer side of the shaft, and an annular grouting curtain body is constructed by grouting; And 7, drawing a groundwater flow field and a groundwater chemical field by on-line monitoring Kong Jiance water level and water quality change conditions before, during and after treatment of the inclined shaft, monitoring and evaluating the treatment effect of the water in the inclined shaft of the coal mine in the strong water-rich strong replenishment stratum, and ensuring safe operation of the inclined shaft of the coal mine in the strong water-rich strong replenishment stratum.
2. The method of treating coal mine inclined shaft water as claimed in claim 1, wherein the directional drilling is provided in a plurality of directional drilling holes respectively arranged at the top, two sides and the bottom of the inclined shaft.
3. The method for treating water in a coal mine inclined shaft as claimed in claim 1, wherein the number m of the directional drilling holes is determined according to the size of the inclined shaft, the value m is 3-5 when the radius of the inclined shaft is 2-4, and the value m is 5-6 when the radius of the inclined shaft is 4-7.
4. The method of water treatment for a coal mine inclined shaft as claimed in claim 1, wherein the annular grouting curtain body comprises an annular grouting curtain core area and an annular grouting curtain peripheral area, the annular grouting curtain core area is a range from the outer wall of the inclined shaft to the outer boundary of a pore crack development area outside the shaft, and the annular grouting curtain peripheral area is a range from the outer boundary of the pore crack development area outside the shaft to the outer boundary of the pore crack development area outside the shaft.
5. The method for treating water in a shaft of an inclined shaft of a coal mine as claimed in claim 1, wherein in the step 6, directional drilling is divided into three-sequence construction, a hole-aligning construction process is adopted for the first sequence and the second sequence, the three-sequence holes are used as inspection holes, and when a slurry leakage condition is found, the three-sequence holes are used as grouting holes for grouting reinforcement; The section length L of each section of directional drilling and grouting is 10-50 m, when the stratum permeability coefficient K is less than 10 -2 cm/s, L is 50m, when K is less than or equal to 10 -2 cm/s and less than or equal to 1cm/s, L is 40m, when K is less than or equal to 1cm/s and less than or equal to 5cm/s, L is 30m, when K is less than or equal to 5cm/s and less than or equal to 10cm/s, L is 20m, and when K is less than or equal to 10cm/s, L is 10m.
6. The method for treating water in a coal mine inclined shaft as claimed in claim 5, wherein the directional drilling and sectional grouting amount is as follows ; Q-directional drilling sectional grouting quantity; -the permeability coefficient of the formation surrounding the borehole; -directional drilling section length; -directional drilling orifice grouting pressure; -water pressure at the point of the contact front of the diffusion slurry of the borehole with water; r-the diffusion radius of the directional drilling grouting slurry; r—directional drilling radius; μ—dynamic viscosity of the liquid.
7. The method for treating water in a shaft of an inclined shaft of a coal mine as claimed in claim 6, wherein in the step 6, directional drilling and annular grouting curtain construction are performed in a manner of being divided into sequential sections, and the method comprises the following steps: Step 6.1, placing an orientation drilling machine at the wellhead position of an inclined shaft, firstly constructing a first section length L of an orientation grouting hole and a first section length L of an orientation pumping hole, installing a grouting pipe and a grouting pressure gauge at the orifice of the orientation grouting hole, grouting into the drilled hole of the first section length L of the orientation grouting hole through the grouting pipe, simultaneously, putting a pumping pump into the orientation pumping hole, pumping water in stratum near the first section length L of the orientation pumping hole out of the drilled hole through the pumping pump, flowing slurry in the orientation pumping hole around the shaft to the orientation pumping hole along the shaft, stopping pumping water when the water pumped out of the orientation pumping hole is changed into turbid slurry from clear water, closing an orifice valve of the orientation pumping hole, and continuing grouting the orientation pumping hole until the grouting flow q 15L/min or the grouting pressure is not less than 2 MPa; step 6.2, installing a grouting pipe and a pressure gauge at the orifice of the first-order directional pumping hole, injecting slurry into a drilling hole with the length L of the first-order directional pumping hole through the grouting pipe, diffusing the slurry in the first-order directional pumping hole along the periphery of a inclined shaft, filling the space of an annular grouting curtain core area and an annular grouting curtain peripheral area, stopping grouting when the orifice grouting flow q is less than or equal to 15L/min or grouting pressure is more than or equal to 2MPa, closing an orifice gate valve of the first-order directional pumping hole, waiting for condensation for 12h, repeating the steps 6.1-6.2, and finishing drilling and grouting of the first-order directional pumping hole and the next-stage length L of the first-order directional pumping hole until drilling and grouting construction of the first-order directional pumping hole and a treatment section Kong Wancheng; Step 6.3, constructing a first section L of a second-order directional grouting hole and a first section length L of a second-order directional pumping hole, installing a grouting pipe and a grouting pressure gauge at the orifice of the second-order directional grouting hole, grouting into a drilled hole of the first section length L of the second-order directional grouting hole through the grouting pipe, simultaneously, putting a pumping pump into the second-order directional pumping hole, pumping water in a stratum near the first section length L of the second-order directional pumping hole out of the drilled hole through the pumping pump, and repeating the step 6.3 to finish drilling and grouting construction of a second-order directional grouting hole and a second-order directional pumping hole treatment section; Step 6.4, drilling the first section length L of the three-sequence directional inspection hole, carrying out a water pressing test, when the water permeability is smaller than 0.1Lu, indicating that the section has good treatment effect and water blocking and seepage preventing effects, and when the water permeability is larger than or equal to 0.1Lu, indicating that the section treatment effect does not reach the standard, and not reaching the effective water blocking and seepage preventing effects, and carrying out grouting reinforcement; And 6.5, repeating the step 6.4, and finishing the drilling of the three-order directional inspection hole, the pressurized water test, the treatment effect evaluation and the grouting reinforcement to form the annular grouting curtain body.
8. The method for treating water in a shaft of an inclined shaft of a coal mine according to claim 7, wherein in the step 6.4, when the water-blocking and seepage-preventing effects of the treating section are not up to the standard, a grouting pipe and a pressure gauge are installed at the orifice of the three-order directional inspection hole, the three-order grouting reinforcement is carried out on the section, and the slurry enters the three-order directional inspection hole through the grouting pipe to supplement the residual spaces of the core area of the annular grouting curtain and the peripheral area of the annular grouting curtain.
9. The method for treating water in a shaft of an inclined shaft of a coal mine according to claim 1, wherein the horizontal distance between the water level and water quality on-line monitoring holes is 80-100 m.

Description

Method for treating water in inclined shaft of coal mine Technical Field The invention belongs to the technical field of mine water damage prevention and pit shaft reinforcement treatment, and relates to a method for treating pit shaft water of an inclined shaft of a coal mine. Background In the development process of the inclined shaft, the inclined shaft needs to pass through aquifers such as a rich water loose layer, a weathered bedrock, a pore crack bedrock and the like, and the construction process has large water quantity and difficult construction. Meanwhile, after the inclined shaft is built, the water level of a loose layer and a base stratum at the outer side of the shaft is continuously raised, and the inclined shaft is very easy to generate water leakage due to the influences of stubble joint gaps, water diversion holes, arch cracks, construction defects and the like of the inclined shaft. The inclined shaft of long-term water leakage can cause water inflow and sand carrying, so that the water inflow of a mine is increased, and the drainage cost is increased. And moreover, the working environment in the well is deteriorated, the environmental protection pressure is increased, the equipment of the well shaft is corroded, the maintenance cost of the equipment of the well shaft is increased, the service lives of the well shaft of the inclined shaft and the mine shaft equipment are reduced, even the well shaft of the inclined shaft is broken, water damage accidents are induced, the safety production is influenced, and the well shaft is scrapped. Aiming at the problem of water leakage of a coal mine inclined shaft, the method mainly comprises the following modes of grouting after the shaft wall, ground grouting and the like. The back grouting of the wall of the inclined shaft is to drill holes in the inclined shaft at certain intervals, and the grouting pipe is put into the inclined shaft to inject slurry into a loose layer and a weathered stratum outside the inclined shaft. The post-grouting mode of the wall of the well bore damages the structure of the well bore, reduces the strength of the well bore and increases the risk of water leakage of the well bore. The ground grouting is to construct vertical or inclined holes on the ground to the water leakage position of the inclined shaft, and to fill slurry into the ground to plug from the loose layer and weathered base stratum outside the water leakage point. Jiang Fushui the pore of the strong supply stratum is extremely developed, the slurry diffusion direction is complex, the diffusion range is difficult to control, and the seepage channel of the pore outside the well bore of the solid inclined shaft is difficult to seal, so that the ideal seepage prevention and leakage blocking effects can not be achieved. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a method for treating the shaft water of the inclined shaft of a coal mine, which solves the problems of water leakage, sand-carrying water burst, structural damage, strength reduction, complex diffusion range of ground vertical drilling grouting slurry, difficult slurry injection, difficult sealing of seepage channels and the like existing in the prior art. In order to solve the technical problems, the invention adopts the following technical scheme: A coal mine inclined shaft water treatment method comprises the following steps: step 1, detecting Jiang Fushui strong supply geological hydrogeological conditions of a loose layer coal mine inclined shaft engineering, dividing the layering position of rock and soil around the inclined shaft, and finding out the tunneling section height of the inclined shaft The tunneling section width B of the inclined shaft is measured, the mechanical parameter cohesive force c and the internal friction angle phi of rock and soil mass around the inclined shaft are measured, the number n of seepage points of the inclined shaft and the water level height of loose layers around the inclined shaft are measured; Step2, calculating the theoretical radius of the loose coil of the surrounding rock of the inclined shaft; Wherein R b Management device is the theoretical radius of the loose ring of surrounding rock of the inclined shaft, and m; Equivalent radius of the tunneling section of the inclined shaft, m, ; H Cartridge , the tunneling section height of the inclined shaft, m; b, the tunneling section width of the inclined shaft, m; P-inclined shaft wellbore surrounding rock initial ground stress, MPa, p=γh Burying process ; Gamma-weight of rock mass surrounding the inclined shaft, N/m 3; H Burying process -the buried depth of the inclined shaft, m; p 1 -primary support reaction force of inclined shaft, MPa; c-the cohesive force of surrounding rocks of the inclined shaft and the shaft, and MPa; phi-friction angle in surrounding rock of inclined shaft; step 3, calculating theoretical radius of plastic region of ro