CN113341479A - Tracing test method for determining hydraulic connectivity of mining area - Google Patents
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- 238000005065 mining Methods 0.000 title claims abstract description 31
- 238000010998 test method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 245
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 98
- 238000002347 injection Methods 0.000 claims abstract description 56
- 239000007924 injection Substances 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000003245 coal Substances 0.000 claims abstract description 23
- 238000005070 sampling Methods 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 230000002706 hydrostatic effect Effects 0.000 claims abstract description 12
- 230000008859 change Effects 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical group [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 69
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 28
- 239000011780 sodium chloride Substances 0.000 claims description 14
- -1 iodide ions Chemical class 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 8
- XMBWDFGMSWQBCA-UHFFFAOYSA-M iodide Chemical compound [I-] XMBWDFGMSWQBCA-UHFFFAOYSA-M 0.000 claims description 6
- 229940006461 iodide ion Drugs 0.000 claims description 3
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 6
- 239000010865 sewage Substances 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 239000010878 waste rock Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004836 empirical method Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000011158 quantitative evaluation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229930091371 Fructose Natural products 0.000 description 1
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 1
- 239000005715 Fructose Substances 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- WQZGKKKJIJFFOK-PHYPRBDBSA-N alpha-D-galactose Chemical compound OC[C@H]1O[C@H](O)[C@H](O)[C@@H](O)[C@H]1O WQZGKKKJIJFFOK-PHYPRBDBSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- NJDNXYGOVLYJHP-UHFFFAOYSA-L disodium;2-(3-oxido-6-oxoxanthen-9-yl)benzoate Chemical compound [Na+].[Na+].[O-]C(=O)C1=CC=CC=C1C1=C2C=CC(=O)C=C2OC2=CC([O-])=CC=C21 NJDNXYGOVLYJHP-UHFFFAOYSA-L 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229930182830 galactose Natural products 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V9/00—Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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Abstract
The invention provides a tracing test method for determining hydraulic connectivity of a goaf, and relates to the technical field of mining engineering and hydraulic testing. The method comprises the following steps: selecting a water injection point and a water outlet point according to the contour line of the coal seam floor of the goaf, and setting the aperture, the inclination angle and the depth of a water injection hole and a water outlet hole; preparing a tracer, and determining the adding amount of the tracer according to the hydrostatic pressure of the goaf, the water level height of the goaf, the water storage coefficient of the gangue, the significance coefficient and the like; injecting a tracer agent from the water injection hole, continuously injecting clear water after the tracer agent is completely injected, opening the water outlet hole to continuously discharge water, and keeping the water injection flow rate larger than the water outlet flow rate; setting sampling interval time, and continuously monitoring the tracer and the water pressure change of a mining area; and judging the water flow connectivity of the goaf according to the concentration of the tracer in the sampling and the water pressure condition of the goaf. The method reasonably determines the adding amount of the tracer, quantitatively evaluates the hydraulic connectivity of the goaf, and provides a basis for underground reservoir construction and sewage treatment.
Description
Technical Field
The invention relates to the technical field of mining engineering and hydraulic test, in particular to a tracing test method for determining hydraulic connectivity of a goaf.
Background
Coal is an important strategic energy source, has obvious characteristics of rich coal and water shortage in the arid and semiarid regions and has sharp contradiction between water resource supply and demand in the mining regions. Therefore, the mine water is protected and utilized in the ecologically vulnerable mining area. In order to solve the problem, a theory and a technical system of the mine underground reservoir are proposed and applied by scholars, and the theory and the technical system become an important way for solving the contradiction between water and coal in the area, wherein the hydraulic connectivity of adjacent goafs is related to the scientific design of mine water purification, storage and utilization systems, and is an essential link in the construction process of the mine underground reservoir. Therefore, a field test of hydraulic connectivity of the goaf needs to be carried out, and scientific basis is provided for the construction of the underground reservoir in the ecological fragile mining area.
Most of the existing hydraulic communication testing methods are tracing methods, and most of the tracing agents are isotope tracing agents, however, the use requirements of the isotope tracing agents are that professionals are needed, special equipment is used, the influence on underground water is large, and the application of the isotope tracing agents in a large range is limited. To address this problem, the prior art includes: chinese patent (CN104808258B) discloses a method for determining the migration path of karst groundwater by using sugar as a tracer, wherein organic substances such as glucose, fructose, galactose and the like are used as the tracer; however, for the special environment of the mine water, in the flowing process of the mine water, organic matters are easy to react with other solutes and go bad, so that the accuracy of a test result is reduced; chinese patent (CN109212254A) discloses a method for measuring underground water migration path by using a tracer, wherein sodium fluorescein is used as the tracer, and the tracer has high sampling requirement and complex operation. In addition, the application of the chemical tracing connectivity test in the exploration of the mine water filling condition (journal of coal, 2014, 39(1):129-134) is a thesis which utilizes sodium chloride as a tracer, however, the adding amount of the tracer is determined according to engineering analogy or empirical formula, the tracer is not suitable for the special water storage space of the coal mine goaf, and the accuracy of the test result is reduced. In addition, the tracer testing method only has one judgment index, and the reliability is lower than that of a multi-index method.
Therefore, it is necessary to improve and develop the existing tracing test method and technology to adapt to the accurate test of the hydraulic connectivity of the coal mine underground mining area, thereby providing an accurate basis for the field engineering.
Disclosure of Invention
In order to reasonably determine the putting amount of a tracer agent, quantitatively evaluate the hydraulic connectivity of a goaf and provide guidance for underground reservoir construction and sewage treatment, the invention provides a tracer test method for determining the hydraulic connectivity of a goaf, and the specific technical scheme is as follows.
A tracer test method for determining hydraulic connectivity of a mined out space, the method steps comprising:
s1, selecting a water injection point and a water outlet point according to a contour line of a coal seam floor of a goaf, and setting the aperture, the inclination angle and the depth of a water injection hole and a water outlet hole;
s2, preparing a tracer, and determining the adding amount of the tracer according to the hydrostatic pressure of the goaf, the water level height of the goaf, the water storage coefficient of the gangue and the significance coefficient;
s3, injecting a tracer from the water injection hole, continuously injecting clear water after the tracer is completely injected, opening the water outlet hole to continuously drain water, and keeping the water injection flow rate larger than the water outlet flow rate;
s4, setting sampling interval time, and continuously monitoring the tracer and the water pressure change of the mining area;
and S5, judging the water flow connectivity of the goaf according to the concentration of the tracer in the sampling and the water pressure condition of the goaf.
Preferably, a water injection hole is arranged at the water injection point, and a water outlet hole is arranged at the water outlet point; and the determined roadway layer height of the water injection point is greater than the roadway layer height of the water outlet point.
Preferably, the diameters of the drilling holes of the water injection hole and the water outlet hole are 90-110 mm; the water outlet holes are arranged at one side of the roadway goaf at an elevation angle theta2Is 5 degrees; the water injection holes are arranged at the shoulder angle position at one side of the goaf in the roadway and the elevation angle theta1Is 10-15 degrees.
Preferably, the depth L of the water injection hole is set1And the drilling depth L of the water outlet hole2The method is determined according to the width of the coal pillar between the roadway and the goaf section, and specifically comprises the following steps:
L1＝(l1+l11)/cosθ1
L2＝l2/cosθ2
wherein the width of the coal pillar between the roadway at the water injection drilling hole and the mining space is l1The width of the coal pillar between the roadway and the mining space at the water outlet drill hole is l2，l11Is the direct top cantilever length.
It is also preferable that a valve and a flow meter are installed at the orifice of the water injection hole, and a valve, a pressure meter and a flow meter are arranged at the position of the water outlet hole.
It is also preferred that the tracer is potassium iodide and the process of determining the amount of tracer to be dosed comprises:
s21, sampling at a water outlet point when a potassium iodide tracer is used, detecting the concentration of iodide ions, and determining an iodide ion concentration background value omega of mine water in the goaf1；
S22, closing a water outlet hole valve, and recording hydrostatic pressure P of the goaf after the reading of a water pressure gauge is stable0And determining the height h of the water level;
s23, determining the adding quantity Q of the potassium iodide tracerPotassium iodide：
Wherein S is the area of the goaf, h is the water level height of the goaf, R is the gangue water storage coefficient of the goaf, 23% is taken, A is the dominant coefficient of the test value and the background value, and 4-8 is taken.
It is also preferable that the potassium iodide tracer is dissolved for a plurality of times and then injected into the water injection pool, the tracer is injected into the goaf by the water pump, and clean water is injected after the tracer injection is completed.
It is also preferable that the sampling interval time is set to 1 day, the valve is closed when sampling, and the water pressure P of the mining area is recorded after the reading of the pressure gauge is stable1(ii) a Then opening the valve to take water sample and detecting the concentration omega of iodide ions2。
It is further preferred that the concentration ω of iodide ions in the sampled water is measured2/ω1Not less than A and P1＞P0Determining that the hydraulic connectivity of adjacent goafs is good; when the concentration omega of iodide ions in the sampled water2≤1.5ω1And P is1＜P0And determining that the hydraulic connectivity of the adjacent goaf is poor.
It is further preferred that the tracer is sodium chloride and the process of determining the amount of tracer to be dosed comprises:
s21, sampling at a water outlet point when a sodium chloride tracer is used, detecting the concentration of chloride ions, and determining a chloride ion concentration background value omega of mine water in the goaf1；
S22, closing water outletThe hydrostatic pressure P of the goaf is recorded after the readings of the hole valve and the water pressure gauge are stable0And determining the height h of the water level;
s23, determining the adding amount Q of the sodium chloride tracerSodium chloride：
Wherein S is the area of the goaf, h is the water level height of the goaf, R is the gangue water storage coefficient of the goaf, 23% is taken, A is the dominant coefficient of the test value and the background value, and 4-8 is taken.
The tracing test method for determining the hydraulic connectivity of the mining area has the advantages that:
(1) the water pressure value of the goaf and the ion concentration background value of the tracer are determined through field test in the test, so that a calculation formula of the adding amount of the tracer can be reasonably determined, the problem that the quantitative evaluation of hydraulic communication of a goaf is difficult to realize due to the fact that the adding amount of the tracer is determined only according to an empirical method is solved, and a basis is provided for underground reservoir construction and mine sewage purification design.
(2) In the method, the hydraulic communication characteristic of the goaf is determined by comprehensively evaluating the two indexes of the concentration change of the tracer and the water pressure change, and the two detection indexes are verified mutually, so that the problem of low stability of a single evaluation index is solved, and the accuracy of a detection result is ensured; in addition, the method also considers the gap water storage characteristic of the waste rock in the goaf and introduces the waste rock water storage coefficient, so that the detection result is more practical.
Drawings
FIG. 1 is a schematic diagram of the placement of water injection holes and water outlet holes;
FIG. 2 is a cross-sectional view of a water injection hole;
FIG. 3 is a cross-sectional view of a water outlet hole;
FIG. 4 is a graph of the change in water pressure of the goaf with time in example 2;
FIG. 5 is a graph showing the change of the concentration of iodide ions with time in sampled water in the goaf in example 2;
in the figure: 1-water injection hole; 2-water outlet; 3-coal pillars between the roadway and the mined-out space; 4-a goaf; and 5-laneway.
Detailed Description
The following description will be made with reference to fig. 1 to 5 for a specific embodiment of a tracing test method for determining hydraulic connectivity of a mining area according to the present invention.
Example 1
A tracer test method for determining hydraulic connectivity of a mined out space, the method steps comprising:
s1, selecting a water injection point and a water outlet point according to the contour line of a coal seam floor of a goaf, and setting the aperture, the inclination angle and the depth of a water injection hole and a water outlet hole.
Wherein, water injection holes are arranged at the water injection points, water outlet holes are arranged at the water outlet points, and the determined roadway layer height of the water injection points is greater than the roadway layer height of the water outlet points. The orifice of the water injection hole is provided with a valve and a flow meter, and the position of the water outlet hole is provided with the valve, a pressure meter and the flow meter. The diameters of the water injection hole and the water outlet hole are 90-110 mm; the water outlet holes are arranged at one side of the roadway goaf at an elevation angle theta2Is 5 degrees; the water injection holes are arranged at the shoulder angle position at one side of the goaf in the roadway and the elevation angle theta1Is 10-15 degrees. Depth L of water injection hole1And the drilling depth L of the water outlet hole2The method is determined according to the width of the coal pillar between the roadway and the goaf section, and specifically comprises the following steps:
L1＝(l1+l11)/cosθ1
L2＝l2/cosθ2
wherein the width of the coal pillar between the roadway at the water injection drilling hole and the mining space is l1The width of the coal pillar between the roadway and the mining space at the water outlet drill hole is l2，l11Is the direct top cantilever length.
S2, preparing a tracer, and determining the adding amount of the tracer according to the hydrostatic pressure of the goaf, the water level height of the goaf, the water storage coefficient of the gangue and the significance coefficient.
The tracer is potassium iodide, and the process for determining the adding amount of the tracer comprises the following steps:
s21, using potassium iodide tracerSampling at a water outlet point, detecting the concentration of iodide ions, and determining the iodide ion concentration background value omega of mine water in the goaf1；
S22, closing a water outlet hole valve, and recording hydrostatic pressure P of the goaf after the reading of a water pressure gauge is stable0And determining the height h of the water level;
s23, determining the adding quantity Q of the potassium iodide tracerPotassium iodide：
Wherein S is the area of the goaf, h is the water level height of the goaf, R is the gangue water storage coefficient of the goaf, 23% is taken, A is the dominant coefficient of the test value and the background value, and 4-8 is taken.
The method determines the water pressure value of the goaf and the ion concentration background value of the tracer through field test, thereby reasonably determining a calculation formula of the adding amount of the tracer, overcoming the defect that the quantitative evaluation of the hydraulic communication of the goaf is difficult to realize due to the fact that the adding amount of the tracer is determined only according to an empirical method, and providing a basis for underground reservoir construction and mine sewage purification design.
And S3, injecting a tracer from the water injection hole, continuously injecting clear water after the tracer is completely injected, opening the water outlet hole to continuously discharge water, and keeping the water injection flow rate larger than the water outlet flow rate.
Continuously injecting clear water with the flow rate of QNote thatOpening water outlet hole to continuously discharge water in the mining area with flow rate of QGo outAnd adjusting a valve at the orifice to keep the flow of water injection and water storage:
Qnote that＞QGo out
Potassium iodide is used as a tracer, the tracer is dissolved for multiple times and then injected into a water injection pool, the tracer is injected into the goaf by a water pump, and clean water is injected after the tracer is injected.
And S4, setting sampling interval time, and continuously monitoring the tracer and the water pressure change of the mining area.
Wherein the interval time can be from every other day to the water outlet point, the valve is closed, and the water is taken after the reading of the water pressure meter is stableWater pressure P in dead zone1(ii) a Opening valve to take water sample for iodine ion concentration omega2And detecting, wherein the interval time can be determined according to the area size of the goaf, when the width of the goaf is more than 100m, the sampling interval time can be 2-3 days, and the total monitoring time is 60 days.
And S5, judging the water flow connectivity of the goaf according to the concentration of the tracer in the sampling and the water pressure condition of the goaf.
When the concentration omega of iodide ions in the sampled water2/ω1Not less than A and P1＞P0Determining that the hydraulic connectivity of adjacent goafs is good; when the concentration omega of iodide ions in the sampled water2≤1.5ω1And P is1＜P0And determining that the hydraulic connectivity of the adjacent goaf is poor.
Example 2
On the basis of example 1, in this embodiment, the tracer is selected to be sodium chloride, and the process of determining the dosing amount of the tracer includes:
s21, sampling at a water outlet point when a sodium chloride tracer is used, detecting the concentration of chloride ions, and determining a chloride ion concentration background value omega of mine water in the goaf1；
S22, closing a water outlet hole valve, and recording hydrostatic pressure P of the goaf after the reading of a water pressure gauge is stable0And determining the height h of the water level;
s23, determining the adding amount Q of the sodium chloride tracerSodium chloride：
Wherein S is the area of the goaf, h is the water level height of the goaf, R is the gangue water storage coefficient of the goaf, 23% is taken, A is the dominant coefficient of the test value and the background value, and 4-8 is taken.
And sodium chloride is used as a tracer, the tracer is dissolved for multiple times and then is injected into a water injection pool, the tracer is injected into the goaf by using a water pump, and clean water is injected after the tracer is injected.
Wherein the interval time can be from every other day to the water outlet point, the valve is closed, and the water pressure is waitedRecording water pressure P of goaf after meter reading is stable1(ii) a Opening a valve to take a water sample to carry out chloride ion concentration omega2And detecting, wherein the interval time can be determined according to the area size of the goaf, when the width of the goaf is more than 100m, the sampling interval time can be 2-3 days, and the total monitoring time is 60 days.
And judging the water flow connectivity of the goaf according to the concentration of the tracer in the sampling and the water pressure condition of the goaf.
When the concentration of chloride ion in the sampled water is omega2/ω1Not less than A and P1＞P0Determining that the hydraulic connectivity of adjacent goafs is good; when the concentration of chloride ion in the sampled water is omega2≤1.5ω1And P is1＜P0And determining that the hydraulic connectivity of the adjacent goaf is poor.
The hydraulic communication characteristic of the goaf is determined by comprehensively evaluating two indexes, namely the change of the concentration of the tracer and the change of the water pressure, and the two detection indexes are verified mutually, so that the problem of low stability of a single evaluation index is solved, and the accuracy of a detection result is ensured; in addition, the method also considers the gap water storage characteristic of the waste rock in the goaf and introduces the waste rock water storage coefficient, so that the detection result is more practical.
Example 3
A tracing test method for determining hydraulic connectivity of a mining area will be described in detail by taking a certain mine as an example on the basis of example 1.
The width of each of the mined-out areas of a certain mine 31307 and a certain mined-out area 31305 is 260m and 300m respectively, the length of a working face is 828m and 868m respectively, the inclination angle of a coal seam is 1 degree, and the area of the mined-out area is 47.57 ten thousand m2The water storage coefficient of the goaf is 23%, the tracer is potassium iodide, and the dominant coefficient A of the test value and the background value is 4.
The invention is utilized to carry out a hydraulic connectivity test of a 31307 goaf and a 31305 goaf.
And S1, determining that a water injection point and a water outlet point are respectively located at the point A and the point B according to the contour line of the coal seam, wherein the widths l of the coal pillars between the point A and the point B and the goaf area are respectively 40m and 30m, and the length of the direct roof is 4 m. The water injection holes are arranged at the shoulder angles of the roadway, the diameter of the water injection holes is 92mm, and the elevation angle theta is1Is 15 ofDegree, depth L1Comprises the following steps:
L1＝(l1+l11)/cosθ1＝44/cos15°＝45.6m
the water outlet hole is arranged in the middle of the roadway, the diameter of the water outlet hole is 92mm, and the elevation angle theta is1Is 5 DEG and a depth L2Comprises the following steps:
L2＝l2/cosθ1＝30/cos5°＝30.1m
wherein a valve and a flowmeter are arranged at the orifice of the water injection hole 1 and used for monitoring the water quantity Q injected into the goafNote thatA valve, a pressure gauge and a flow meter are arranged at the position of the water outlet hole and used for monitoring the hydrostatic pressure P and the water yield Q of the goafGo out。
S2: sampling at a water outlet point B, detecting the concentration of the iodide ions, and determining a background value omega of the concentration of the iodide ions in the outlet water of the goaf1Is 27.52mg/m3(ii) a Closing the water outlet hole valve, and recording the hydrostatic pressure P of the goaf after the reading of the water pressure gauge is stable00.0549MPa, and the water level height h is determined to be 5.19 m.
Determination of potassium iodide tracer dosage QPotassium iodideI.e. by
S3: dissolving 82kg potassium iodide tracer agent for four times, pouring into a water injection pool, injecting into a goaf through a water pump, continuously injecting clear water after the potassium iodide tracer agent is completely injected, and adjusting a valve at an orifice and a flow QNote thatIs 40m3Opening water outlet holes, continuously discharging water stored in the goaf, and discharging flow QGo outIs 26m3/h。
S4: closing the valve every other day to a water outlet point B, recording the water pressure P of the goaf area after the reading of the water pressure gauge is stable1(ii) a Opening valve to take water sample for iodine ion concentration omega2Detecting to obtain water pressure P of the mining area1And the iodine ion concentration of the water sample changes along with time, which is shown in figure 4 and figure 5, and the total monitoring time is 45 days.
Wherein the goaf is filled with potassium iodide tracer 12 days laterThe water pressure appeared to rise obviously and continuously, at 45 days, P1Is 0.075MPa greater than P0(ii) a After 20 days of the potassium iodide tracer input, there was an increase in potassium iodide concentration in the water sample and a maximum concentration at day 30, and ω2/ω1Greater than a, 4.91, so it was judged 31307 and 31305 goafs had good hydraulic connectivity.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. A tracer test method for determining hydraulic connectivity of a mined out space, characterized in that the method steps comprise:
s1, selecting a water injection point and a water outlet point according to a contour line of a coal seam floor of a goaf, and setting the aperture, the inclination angle and the depth of a water injection hole and a water outlet hole;
s2, preparing a tracer, and determining the adding amount of the tracer according to the hydrostatic pressure of the goaf, the water level height of the goaf, the water storage coefficient of the gangue and the significance coefficient;
s3, injecting a tracer from the water injection hole, continuously injecting clear water after the tracer is completely injected, opening the water outlet hole to continuously drain water, and keeping the water injection flow rate larger than the water outlet flow rate;
s4, setting sampling interval time, and continuously monitoring the tracer and the water pressure change of the mining area;
and S5, judging the water flow connectivity of the goaf according to the concentration of the tracer in the sampling and the water pressure condition of the goaf.
2. The tracer method for determining the hydraulic connectivity of a mining area according to claim 1, wherein a water injection hole is arranged at the water injection point, and a water outlet hole is arranged at the water outlet point; and the determined roadway layer height of the water injection point is greater than the roadway layer height of the water outlet point.
3. A method as claimed in claim 2The tracing test method for determining the hydraulic connectivity of the mining area is characterized in that the diameters of drill holes of a water injection hole and a water outlet hole are 90-110 mm; the water outlet holes are arranged at one side of the roadway goaf at an elevation angle theta2Is 5 degrees; the water injection holes are arranged at the shoulder angle position at one side of the goaf in the roadway and the elevation angle theta1Is 10-15 degrees.
4. The tracer method for determining hydraulic connectivity of a mined-out area according to claim 3, characterized in that the drilling depth L of the water injection hole1And the drilling depth L of the water outlet hole2The method is determined according to the width of the coal pillar between the roadway and the goaf section, and specifically comprises the following steps:
L1＝(l1+l11)/cosθ1
L2＝l2/cosθ2
wherein the width of the coal pillar between the roadway at the water injection drilling hole and the mining space is l1The width of the coal pillar between the roadway and the mining space at the water outlet drill hole is l2，l11Is the direct top cantilever length.
5. The tracer method for determining the hydraulic connectivity of a mining area according to claim 4, wherein a valve and a flow meter are installed at the orifice of the water injection hole, and the valve, the pressure meter and the flow meter are installed at the position of the water injection hole.
6. The tracer method for determining hydraulic connectivity of a mining area according to claim 1, wherein the tracer is potassium iodide, and the step of determining the amount of the tracer to be put comprises:
s21, sampling at a water outlet point when a potassium iodide tracer is used, detecting the concentration of iodide ions, and determining an iodide ion concentration background value omega of mine water in the goaf1；
S22, closing a water outlet hole valve, and recording hydrostatic pressure P of the goaf after the reading of a water pressure gauge is stable0And determining the height h of the water level;
s23, determining the adding of the potassium iodide tracerQuantity QPotassium iodide：
Wherein S is the area of the goaf, h is the water level height of the goaf, R is the gangue water storage coefficient of the goaf, 23% is taken, A is the dominant coefficient of the test value and the background value, and 4-8 is taken.
7. The tracer method according to claim 6, wherein the potassium iodide tracer is dissolved in multiple times and then injected into the water injection tank, the tracer is injected into the goaf by a water pump, and after the tracer injection is completed, clean water starts to be injected.
8. The tracer test method for determining hydraulic connectivity of a mining area according to claim 1, wherein the sampling interval is set to 1 day, the valve is closed during sampling, and the water pressure P of the mining area is recorded after the reading of the pressure gauge is stabilized1(ii) a Then opening the valve to take water sample and detecting the concentration omega of iodide ions2。
9. Tracer test method for determining the hydraulic connectivity of a goaf according to claim 8,
when the concentration omega of iodide ions in the sampled water2/ω1Not less than A and P1＞P0Determining that the hydraulic connectivity of adjacent goafs is good; when the concentration omega of iodide ions in the sampled water2≤1.5ω1And P is1＜P0And determining that the hydraulic connectivity of the adjacent goaf is poor.
10. The tracer method for determining hydraulic connectivity of a mining area according to claim 1, wherein the tracer is sodium chloride, and the step of determining the adding amount of the tracer comprises the following steps:
s21, when a sodium chloride tracer agent is used,sampling at a water outlet point, detecting the concentration of chloride ions, and determining the chloride ion concentration background value omega of mine water in the goaf1；
S22, closing a water outlet hole valve, and recording hydrostatic pressure P of the goaf after the reading of a water pressure gauge is stable0And determining the height h of the water level;
s23, determining the adding amount Q of the sodium chloride tracerSodium chloride：
Wherein S is the area of the goaf, h is the water level height of the goaf, R is the gangue water storage coefficient of the goaf, 23% is taken, A is the dominant coefficient of the test value and the background value, and 4-8 is taken.
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