CN113063709B - Method for determining curtain under complex aquifer condition - Google Patents
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Abstract
The invention discloses a method for determining curtain positions and parameters under complex aquifer conditions, which comprises the steps of firstly determining curtain construction positions according to a curtain position selection principle, then respectively determining the length, the height and the effective width of a curtain according to a corresponding curtain parameter calculation formula, and finally further correcting and optimizing curtain parameters through permeability coefficients of a curtain engineering test. Compared with the existing empirical construction method, the curtain position and parameters obtained by the method are more reasonable and reliable, the curtain interception requirement under the complex aquifer condition is met, and the quantitative design of the curtain position and parameters under the complex aquifer condition is realized.
Description
Technical Field
The invention belongs to the technical field of coal mine water control, and particularly relates to a method for determining a curtain under a complex aquifer condition.
Background
The curtain closure technology is a method for constructing a curtain by using drilling grouting and blocking underground water of a mining area, and through practice and development for many years, the grouting curtain closure technology of the mining area in China is mature, but the curtain design position and parameters under the conditions of huge thickness, complex medium and high confined aquifer are not determined.
Aiming at the water hazard treatment under the complex conditions, the prior method has the following problems:
1) The areas are directly drained, so that huge stable replenishment is formed under the condition of moving water, the difficulty of drainage is high, and the cost is extremely high;
2) The problems of high construction difficulty, poor reliability and high safety risk exist by utilizing local indirect drainage;
3) The method of draining water can not thoroughly and radically treat the water damage of the water-bearing layer, and the conventional curtain design has limited closure effect (the closure rate is generally about 70%), the depth of burial of the injected layer is smaller except the thin limestone curtain, the bearing water pressure is smaller, and the curtain is built in a single water-bearing medium. Conventional curtain designs fail to meet curtain closure requirements under complex aquifer conditions.
In order to solve this problem of curtain construction under complex conditions, it is necessary to determine the position and parameters of the curtain under complex aquifer conditions.
Disclosure of Invention
The invention provides a method for determining positions and parameters of curtains under complex aquifer conditions, which solves the problem of water damage prevention and control under complex aquifer conditions in the prior art and solves the technical problems of high construction difficulty, poor reliability, high safety risk and unsolvable conventional curtains in a simple sparse-drop mode in the prior art.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a method for determining a curtain under a complex aquifer condition comprises the following steps:
step one, determining the position of a curtain to be built;
step two, determining the real building position and length of the curtain;
1) Determining the development form of the protected exploitation resources in the curtain wall;
2) According to the formula
Z＝H 1 tanα+H 2 tanβ
Wherein: z-mining affects belt width, m;
H 1 -bedrock thickness, m;
H 2 loose layer thickness, m;
alpha-the crack angle of the resource exploitation at the bedrock section;
beta, loose interval crack angle, degree;
calculating to obtain an influence zone width Z, and adding a certain protection zone range x to obtain a curtain safety distance Z '=Z+x, namely the outcrop distance of the curtain line from the exploitation resource is larger than Z';
3) Determining the position and length of a final curtain;
step three, determining the height h of the curtain
1) Selecting curtain construction types, including bottom falling type and hanging type;
2) Determining the design height of the curtain according to a formula;
wherein: h, designing the height of the curtain, m;
h 1 -the desired aquifer thickness, m;
h 2 the thickness of the curtain entering the target aquifer, m;
a, the distance that the curtain needs to enter the top water-resisting layer is m;
b, the distance that the curtain needs to enter the bottom water-resisting layer is m;
step four, determining the effective width L of the curtain, wherein a calculation formula is as follows:
wherein: l, effective width of curtain, m;
θ—head correction coefficient, 1.1 to 1.3;
p, the maximum water head born by the curtain, m;
T s -the penetration ratio allowed by the curtain decreases;
and the lateral pressure coefficient of the curtain is 0.7-0.9.
Further, the method further comprises the following steps:
step five, determining a curtain interception index permeability coefficient K, wherein a calculation formula is as follows:
K＝QL/AΔH
wherein: l, effective width of curtain, m;
Δh—the head difference, m, the curtain is subjected to;
k is permeability coefficient, m/d;
q-surplus excess Water of curtain, m 3 /h；
A-curtain water passing area, m 2 。
Step six: determining the permeability coefficient K 'of the curtain of the actual engineering'
1) Carrying out curtain construction engineering test;
2) Determining the permeability coefficient of the test curtain according to a pressurized water test on the test curtain, wherein the formula is as follows:
wherein: k (K) n -curtain permeability coefficient of each borehole, n being the borehole number;
k' -the overall permeability coefficient of the test curtain, m/d;
mu-flow rate of pressurized water, L/min;
l is the length of the pressurized water section, m;
s, water head difference and m in test water pressure;
r-drilling radius, m;
3) If K' is less than or equal to K, the curtain established by the curtain test engineering meets the interception requirement; otherwise, the curtain design parameters need to be readjusted to meet the requirements.
Further, determining the position of the curtain in the first step specifically includes:
the top and bottom boundaries of the built curtain layer are stable relative water-resisting layers, and the curtain is prevented from flowing around the top and bottom after being built;
curtain starting points are extended to a certain safety range on a stable water-proof boundary, or two ends are overlapped in a lap joint mode, and lateral bypass is avoided after the curtain is built;
continuously constructing a curtain to fully border, and after the curtain is constructed, realizing all-line interception of various lateral feeding and runoff channels, and improving the interception rate;
the curtain avoids large fault structures along the line, is built in a relatively stable stratum, and prevents fault bypass and faults from affecting the stability of the curtain.
Further, in the second step, the guard band range x takes a value of 30-40 m.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the existing empirical construction method, the curtain position and parameters obtained by the method are more reasonable and reliable, the curtain interception requirement under the complex aquifer condition is met, and the quantitative design of the curtain position and parameters under the complex aquifer condition is realized.
2. The method of the invention provides a principle of selecting the position of the deep-buried huge thick complex medium curtain of the mine, wherein the position of the curtain is provided with a partition at the top and the bottom, edge sealing at two ends, full-line interception and winding avoidance structure, so that the stability of the curtain is ensured, and the curtain interception rate is improved to the maximum extent.
3. The mining influence zone width Z calculation method provided by the step two of the method mainly considers the crack angles of the loose layer and the bedrock, and combines the layer height to obtain the outcrop distance of the curtain line from the mining resource, thereby establishing the curtain, avoiding influencing the established curtain during resource mining, and ensuring the integrity of the curtain.
4. According to the method for calculating the height h of the hanging type and bottom falling type curtains, parameters a and b in the method are distances of the curtains entering the top and bottom of the water-bearing layer, the height of the curtains is calculated through the method, the phenomenon of flowing around can be well prevented, and the intercepting effect of the curtains is further improved.
4. The effective width of the curtain is calculated by adopting the concept of the ratio of the water head of the water-bearing layer to the permeability ratio of the curtain, and the effective width is further corrected and optimized by utilizing the water head correction coefficient and the curtain lateral pressure coefficient.
5. In the fifth and sixth steps of the method, in the curtain test engineering, the curtain permeability coefficient of each drilling hole is calculated, then the maximum curtain permeability coefficient in all drilling holes is taken as the overall curtain permeability coefficient K ', K ' and K ' are compared to guide the determination of curtain parameters, the design of the curtain parameters is further optimized, the curtain interception effect of the built curtain is ensured by means of the parameter correction means, and the specific construction process is greatly simplified.
Drawings
FIG. 1 is a flow chart of a curtain position and technical parameter determination technique;
FIG. 2 is a position diagram of a curtain;
FIG. 3 is a schematic diagram of mining area of influence;
FIG. 4 is a schematic illustration of a curtain height determination.
In the figure, 1-F21 water-stop fault boundary, 2-five contain ablation boundary, 3-curtain.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following examples, and it is apparent that the described examples are only some of the examples of the present invention, but not all of the examples. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The basic idea of the invention is as follows: firstly, determining a curtain construction position according to a curtain position selection principle, then respectively determining the length, the height and the effective width of the curtain according to a corresponding curtain parameter calculation formula, and finally correcting and optimizing curtain parameters by further indexes of permeability coefficients of a curtain engineering test.
Examples:
the north wings of certain well field in Huaibei are distributed with a layer of deep buried, huge thick and extremely strong aquifer-dwarf-system bottom conglomerate (commonly called five-bearing) mainly composed of limestone gravel and brecci, and the four-bearing whole angle is not integrated to cover all the stratum below. There is extremely close hydraulic connection between the five-component and four-component, too-aogray aquifers. In a certain year, the five-water-containing sand-bursting accident occurs on the working face of the well Tian Mou, so that the serious loss is caused, the five-water-containing damage seriously threatens the safe exploitation of the underlying coal, and the five-water-containing damage needs to be solved. The condition of the five aquifers meets the setting of the complex aquifers, and finally, the curtain interception green mining comprehensive treatment project is formulated through repeated research and demonstration.
The embodiment provides a method for determining positions and parameters of curtains under complex aquifer conditions, which is used for the above engineering, and referring to fig. 1 and 2, the method comprises the following steps:
(1) According to the curtain position selection principle of the step one, namely the curtain position selection principle of the structure with a partition at the top and the bottom, edge sealing at the two ends, full line interception and winding avoidance, the west side of the water-bearing layer of the study area is provided with a water-proof condition for the ablation boundary, and finally, the curtain starting and stopping points of the study area are determined as follows: the starting point is established at the eastern side F21 water-proof fault boundary 1, and the end point is established outside the five-layer ablation boundary 2 at the west end of the curtain 3.
(2) Coal seam mining is carried out on the actual measurement data of a study area, wherein the crack angle alpha of a bedrock section is 75 degrees, the crack angle beta of a loose layer section is 42 degrees, and the bedrock thickness H 1 Thickness of loose layer H of 15m 2 4m, and then according to fig. 2 and step two, the band width calculation formula is affected:
Z＝H 1 tanα+H 2 tanβ
calculating Z=60 m, and the protective belt range x is generally 30-40 m, and finally determining that the curtain safety distance Z' is 90-100 m, namely the distance between the curtain line and the outcrop of the mining coal seam is larger than 100m. The curtain range is determined by the following steps: the 8 coal outcrop is not less than 100m outward and the Taiyuan limestone outcrop line is not less than 40m inward and is not less than 40m south. The final planar shape of the curtain was determined to be an inverted "L" layout, built at both ends, and the total length of the curtain was expected to be about 3.19Km, see FIG. 3.
(3) The curtain is to cover the water passage completely in cross section, and the top and bottom must be built in stable opposite water-resisting layers, so that a falling bottom curtain is built. According to the three-step curtain height calculation formula:
combining with research area data, five wind oxidation zones with the bottom of about 5m exist, taking the problem of wind oxidation zones, faults and other special sections into consideration, wherein the curtain needs to enter the top water-resisting layer by 5-10 m, namely a is 10m, enters the bottom water-resisting layer by not less than 15m, and b is 15m; the fifth thickness h1 varies from 45m to 65m, thus determining the curtain height to be about 60 to 80m, see in particular FIG. 4.
(4) The maximum water head p=4MPa born by the built curtain is obtained according to geological data of a research area, the permeability ratio drop of the curtain is generally 0.15MPa/m, the water head correction coefficient theta is 1.2, and the lateral pressure coefficient of the curtain is 0.8. And (3) calculating a formula by means of the effective width of the curtain in the step four:
the effective curtain width L was calculated to be 40m.
(5) According to engineering geological conditions and actual requirements, the five-component hydrophobic safety water head difference is-400 m, namely delta H=400 m, and the residual water flow Q=350m of the curtain 3 And/h, and predicting the water passing area A= 525000m according to the curtain 2 Substituting the osmotic coefficient calculation formula:
K＝QL/AΔH
k=0.0016 m/d was obtained.
(6) Before the treatment project, a curtain project test is carried out, the permeability coefficient K 'of the test curtain is determined to be 0.0008m/d according to the pressurized water test result on the test curtain, and comparison shows that the permeability coefficient index K' of the test curtain is smaller than the permeability coefficient index K of the curtain design, which indicates that the parameter selection of the treatment project is reasonable and practical, and the curtain interception effect of 85% can be achieved.
The foregoing is illustrative of the present invention, but the present invention is not limited to the above-mentioned embodiments, and can be applied to similar products, and any person skilled in the art will be able to make variations or modifications within the scope of the present invention.
Claims (3)
1. The method for determining the curtain under the complex aquifer condition is characterized by comprising the following steps of:
step one, determining the position of a curtain to be built;
step two, determining the real building position and length of the curtain;
1) Determining the development form of the protected exploitation resources in the curtain wall;
2) According to the formula
Z＝H 1 tanα+H 2 tanβ
Wherein: z-mining affects belt width, m;
H 1 -bedrock thickness, m;
H 2 loose layer thickness, m;
alpha-the crack angle of the resource exploitation at the bedrock section;
beta, loose interval crack angle, degree;
calculating to obtain an influence zone width Z, and adding a certain protection zone range x to obtain a curtain safety distance Z '=Z+x, namely the outcrop distance of the curtain line from the exploitation resource is larger than Z';
3) Determining the position and length of a final curtain;
step three, determining the height h of the curtain
1) Selecting curtain construction types, including bottom falling type and hanging type;
2) Determining the design height of the curtain according to a formula;
wherein: h, designing the height of the curtain, m;
h 1 -the desired aquifer thickness, m;
h 2 the thickness of the curtain entering the target aquifer, m;
a, the distance that the curtain needs to enter the top water-resisting layer is m;
b, the distance that the curtain needs to enter the bottom water-resisting layer is m;
step four, determining the effective width L of the curtain, wherein a calculation formula is as follows:
wherein: l, effective width of curtain, m;
p, the maximum water head born by the curtain, m;
T s -the penetration ratio allowed by the curtain decreases;
taking 0.7-0.9 of curtain lateral pressure coefficient;
further comprises:
step five, determining a curtain interception index permeability coefficient K, wherein a calculation formula is as follows:
K＝QL/AΔH
wherein: l, effective width of curtain, m;
Δh—the head difference, m, the curtain is subjected to;
k is permeability coefficient, m/d;
q-surplus excess Water of curtain, m 3 /h；A
Curtain water passing area, m 2 ；
Step six: determining the permeability coefficient K 'of the curtain of the actual engineering'
1) Carrying out curtain construction engineering test;
2) Determining the permeability coefficient of the test curtain according to a pressurized water test on the test curtain, wherein the formula is as follows:
wherein: k (K) n -curtain permeability coefficient of each borehole, n being the borehole number;
k' -the overall permeability coefficient of the test curtain, m/d;
mu-flow rate of pressurized water, L/min;
l is the length of the pressurized water section, m;
s, water head difference and m in test water pressure;
r-drilling radius, m;
3) If K' is less than or equal to K, the curtain established by the curtain test engineering meets the interception requirement; otherwise, the curtain design parameters need to be readjusted to meet the requirements.
2. The method for determining a curtain under complex aquifer conditions according to claim 1, wherein determining the position of the curtain in step one comprises:
the top and bottom boundaries of the built curtain layer are stable relative water-resisting layers, and the curtain is prevented from flowing around the top and bottom after being built;
curtain starting points are extended to a certain safety range on a stable water-proof boundary, or two ends are overlapped in a lap joint mode, and lateral bypass is avoided after the curtain is built;
continuously constructing a curtain to fully border, and after the curtain is constructed, realizing all-line interception of various lateral feeding and runoff channels, and improving the interception rate;
the curtain avoids large fault structures along the line, is built in a relatively stable stratum, and prevents fault bypass and faults from affecting the stability of the curtain.
3. The method for determining a curtain under complex aquifer conditions according to claim 2, wherein in the second step, the guard band range x takes a value of 30-40 m.
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| CN114184531B (en) * | 2021-11-18 | 2023-05-12 | 中煤科工集团西安研究院有限公司 | Test device and test method for optimizing position and evaluating effect of water interception curtain |
| CN114658485B (en) * | 2022-03-02 | 2023-05-16 | 中煤科工集团西安研究院有限公司 | Composite disaster treatment method for water damage and rock burst of thick and hard sandstone roof of coal mine |
| CN115341902B (en) * | 2022-08-17 | 2023-06-13 | 中煤科工西安研究院(集团)有限公司 | Coal mine working face surrounding rock lateral closed curtain water-retaining coal mining method |
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