CN102243163A - Quantitative evaluation method for permeability of faults of coal mine - Google Patents

Quantitative evaluation method for permeability of faults of coal mine Download PDF

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CN102243163A
CN102243163A CN 201110098537 CN201110098537A CN102243163A CN 102243163 A CN102243163 A CN 102243163A CN 201110098537 CN201110098537 CN 201110098537 CN 201110098537 A CN201110098537 A CN 201110098537A CN 102243163 A CN102243163 A CN 102243163A
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water
pressure
stage
tomography
value
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CN102243163B (en
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易伟欣
袁海滨
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Henan University of Technology
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Henan University of Technology
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Abstract

The invention relates to the technical field of coal mine hydrogeology engineering, and discloses a quantitative evaluation method for permeability of faults of a coal mine in mining of coal seams. A water pressurizing experiment is performed on a closed evaluation region through a water supply system, water is injected into the evaluation region by stages at certain pressure, and injection pressure is improved by stages, when the set water injection pressure of each stage is achieved, quantity of injected water is recorded by a flow gauge; and when the water injection pressure reaches a maximum pressure value, the water supply is stopped and the evaluation region is closed, and then, the time needed for the maximum pressure value of the closed region to drop to a certain predetermined pressure value is determined. In the actual determination process, only the data of the time duration is needed to be determined, a coefficient of permeability can be visually read from a graph, and the coefficient of permeability of a low-permeability fault zone of the coal mine can be quickly determined. The whole experiment process and the evaluation process cost little time, the work of grouting performed for the faults after the water pressurizing experiment can be directly performed uninterruptedly, and work efficiency of coal mining is significantly improved.

Description

A kind of colliery tomography permeance property method for quantitatively evaluating
Technical field
The present invention relates to colliery hydrogeology field of engineering technology, particularly relate to a kind of in seam mining the rapid quantitatively evaluating method of the permeance property of disclosed distributed fault.
Background technology
The most geologic condition complexity of China's coal-mine, geologic hazard is frequent, and underground water damage is particularly serious, has the gushing water accident to take place constantly in exploitation.At present, mine water inrush hazard prediction and control are still a difficult problem in the coal mining.According to statistics, the colliery has 80% gushing water accident all to occur near the component in fault structure zone, coalfield experience repeated tectonic movements, have many big-and-middle-sized tomographies in the coalfield, because the existence of these big-and-middle-sized tomographies makes the formation permeability in coalfield can have unevenness, and same tomography, also different in distributed fault different parts permeance property, caused the complicacy of mine water inrush hazard prediction and control.
The colliery is in actual recovery process, when running into tomography, the permeance property that the coal mining geology personnel use the mechanical property (promptly whether extensional fault, pressure property tomography or the pressure property turned round tomography) of fault throw, tomography vaguely, whether come the qualitative evaluation tomography with characteristic such as water-bearing zone communication, simply be divided into the water guide tomography and the tomography that blocks water, with this as when exploitation whether directly by tomography or keep the foundation of barrier pillar, do not have concrete data to estimate the permeance property of tomography.In the hydrogeology of colliery, generally before coal mining, explore period at geotechnical boring, do the experiment of drawing water and determine the hydrogeological parameter in each water-bearing zone in the colliery, release (storage) water coefficient S etc. such as coefficient of permeability K, coefficient of pressure conductivity a and unit, do the experiment of drawing water to determine the hydrogeological parameter of tomography at tomography seldom specially.And the distributed fault anisotropic character is obvious, the superficial part of distributed fault and deep water permeability difference are big, and the experiment of drawing water is handled the water-bearing zone in itself as isotropic body, the bailing test data can not reflect rock mass Penetration Signature inhomogeneous in spatial distribution, can't instruct the coal mining engineering to handle.And draw water and test expend time in length, equipment and labour cost height.And the colliery when a certain working face mining or tunnelling often the duration short, be pressed for time, and when directly crossing tomography in exploitation or the excavation work, require to carry out tomography slip casting operation at once, so on mechanism and economic angle, want to determine the hydrogeological parameter of disclosed tomography in the coal mining, selecting for use expends time in lacks, and packer permeability test artificial and that cost of equipment is low is proper.
The present production unit of China Lv Rong method packer permeability test carried out of water conservancy and hydropower department particularly be stablize the well stream theory, and packer permeability test lasts weak point, is astable well stream, thereby the infiltration coefficient error certainty that Lv Rong method packer permeability test calculates greatly.And underground water steady flow theory can not be estimated the change in time and space of the osmotic strength of anisotropic distributed fault and infiltration, osmotic pressure damage or infiltration, osmotic pressure stability.And, the tomography that can directly pass through in the general coal mining, it is the low tomography of permeance property, and Lv Rong method packer permeability test cannot be measured the injection rate IR of water of the rock mass of poor permeability, the Lv Rong number is 0, also just cannot carry out infiltrative quantitative evaluation, so Lv Rong method packer permeability test is not suitable for the permeance property evaluation of the colliery tomography of poor permeability.During coal mining, permeable in order to prevent tomography under the influence of hydraulic pressure of confined aquifer, to lag behind behind tomography, require tomography to be carried out the slip casting operation at once.And after only drawing definite infiltration coefficient, could determine suitable method for implanting, injection rate IR and injecting material or the like.So, in order to overcome the above problems, a kind of method for quantitatively evaluating that oozes coefficient thoroughly of can be at short notice determining on-the-spot colliery distributed fault is fast proposed, for the coal mining operation safe, efficiently very be necessary.
Summary of the invention
The present invention is directed to the prior art deficiency,, propose a kind of disclosing the rapid quantitatively evaluating method of distributed fault permeance property in the coal mining from the moisture feature of packer permeability test principle and colliery tomography.
The technical solution adopted in the present invention:
A kind of colliery tomography permeance property method for quantitatively evaluating, by water system the evaluation interval that seals is carried out the setting-out experiment, water system adopts the water pump and the pipeline of grouting device, to evaluation interval stage by stage level pressure power inject water, and improve injection pressure stage by stage, when reaching the injection water pressure of each stage setting, by the each volume of water input of cmf record, when water injection pressure reaches the hydraulic pressure in the piestic water water-bearing zone that is communicated with tomography when consistent, obtain maximum pressure value, stop to supply water, seal evaluation interval simultaneously, the pressure of measuring the closed interval drops to the needed time T t of force value of a certain setting from maximum pressure value, and the observed pressure P rule that T in time changes that descends is calculated the hydrogeological parameter of colliery tomography according to descend rule that T in time changes of pressure P then.
Described colliery tomography permeance property method for quantitatively evaluating, the hydraulic pressure in the piestic water water-bearing zone that injection pressure of setting stage by stage and maximum pressure value basis and tomography are communicated with is set, when injecting water stage by stage, in under the pressure stability in evaluation interval, measure the volume of water input in per stage by flowmeter; When the pressure in the evaluation interval under the unmeasured situation of the injection rate IR of certain process stage water, promptly reach maximum injection pressure, stop to supply water this moment, the sealing evaluation interval.
Described colliery tomography permeance property method for quantitatively evaluating, the pressure of closed interval drops to the size of the force value of a certain setting from maximum pressure, is set at 80%~90% of maximum pressure value according to field condition.
Described colliery tomography permeance property method for quantitatively evaluating, volume of water input when testing according to setting-out, geological condition in conjunction with distributed fault, geological condition when boring is crept into toward distributed fault and the recovery situation of drilling water level, provide an infiltration coefficient in advance and decide empirical value Kc, be that several infiltration coefficients are set out at the center again with this empirical value Kc then, utilize the unsteady state flow through porous medium differential equation and finite element method, in conjunction with the actual geologic condition of tomography, real data when creeping into and parameter are calculated the pressure of each infiltration coefficient in this evaluation interval and the relation in elapsed time with computational tool or establishment finite element program, in computing machine, draw the P-T curve map of each infiltration coefficient by the figure table function of Excel, convert the Kc-T curve map then to, the pairing infiltration coefficient of required time (Tt) (Kt) that determines of packer permeability test before reading from curve map promptly obtains the infiltration coefficient of this evaluation interval.
Useful good effect of the present invention:
1, colliery of the present invention tomography permeance property method for quantitatively evaluating, the evaluation that the permeance property of the low-permeability colliery tomography that in the past can't carry out quantitative evaluation can fast quantification is come out, only need determine these data of elapsed time in the practical measurement process, packer permeability test one finishes, the distributed fault infiltration coefficient is just determined at once, can determine injecting paste material and injection rate IR and injection mode with that, and need not carry out the device replacement and directly just can carry out the slip casting operation, be particularly suitable for Coal Production with the setting-out experimental provision.Packer permeability test and the slip casting operation enforcement that can uninterruptedly link up can significantly improve the coal mining work efficiency.
2, colliery of the present invention tomography permeance property method for quantitatively evaluating is simple to operate, economical and efficient.Compare with traditional water-pressurizing test method, replaced the steady flow theory with the unsteady fluid flow theory in theory, increase the observation time variable during water-pressurizing test method operation, more near the site test condition, and can calculate the hydrogeological parameter such as infiltration coefficient, coefficient of pressure conductivity of subjects fast.Computer analyzing computation process can begin in earlier stage at packer permeability test, the analytical Calculation engineering also finished before packer permeability test finished, the packer permeability test scene does not need to be the professional that perviousness is estimated, and the field personnel only need read infiltration coefficient just on figure, saved labour cost.
Description of drawings
Fig. 1 is a colliery of the present invention tomography permeance property method for quantitatively evaluating packer permeability test apparatus structure synoptic diagram; Fig. 2 is infiltration coefficient and elapsed time Kc-T figure;
Fig. 3-A is 1.0 * 10 for working as infiltration coefficient -6(m/s) out-of-phase diagram;
Fig. 3-B is 5.0 * 10 for working as infiltration coefficient -7(m/s) out-of-phase diagram;
Fig. 3-C is 1.0 * 10 for working as infiltration coefficient -7(m/s) out-of-phase diagram;
Fig. 3-D is 5.0 * 10 for working as infiltration coefficient -8(m/s) out-of-phase diagram;
Fig. 3-E is 1.0 * 10 for working as infiltration coefficient -8(m/s) out-of-phase diagram;
Fig. 3-F is 5.0 * 10 for working as infiltration coefficient -9(m/s) out-of-phase diagram;
Fig. 3-G is 1.0 * 10 for working as infiltration coefficient -9(m/s) out-of-phase diagram.
Embodiment
Embodiment one: referring to Fig. 1, colliery of the present invention tomography permeance property method for quantitatively evaluating, by water system the evaluation interval 9 that seals is carried out the setting-out experiment, the observed pressure time dependent rule that descends, and calculate hydrogeological parameter according to descend time dependent rule of pressure, water system adopts the water pump 2 and the pipeline 6 of grouting device, to evaluation interval stage by stage level pressure power inject water, and improve injection pressure stage by stage, when reaching the injection water pressure of each stage setting, by the each volume of water input of flowmeter 3 records, when water injection pressure reaches the hydraulic pressure in the piestic water water-bearing zone that is communicated with tomography when consistent, obtain maximum pressure value, stop to supply water, seal evaluation interval simultaneously, the pressure of measuring the closed interval drops to the needed time T t of force value of a certain setting from maximum pressure value, and draw the P-T curve map of pressure and time, convert the Kc-T curve map then to, the pressure of reading the closed interval from curve map drops to the coefficient of permeability K t of the needed time T t correspondence of force value of a certain setting from maximum pressure value, promptly obtains the infiltration coefficient of this evaluation interval.
Number in the figure 1 is a water tank, and 2 is water pump, and 3 is flowmeter, and 4 is valve, and 5 is pressure gauge, and 6 is pipeline, and 7 are boring, and 8 is rubber stopper, and 9 is evaluation interval.
Injection pressure of setting stage by stage and maximum pressure value can basis and the hydraulic pressure in the piestic water water-bearing zone that is communicated with of tomography set suitable value, when injecting water stage by stage, in under the pressure stability in evaluation interval 9, measure the volume of water input in per stage by flowmeter 3; When the pressure in the evaluation interval under the unmeasured situation of the injection rate IR of certain process stage water, promptly reach maximum injection pressure, stop to supply water this moment, valve-off 4, sealing evaluation interval 9.The pressure of closed interval drops to the size of the force value of a certain setting from maximum pressure, according to the field condition adjustment, can be set at 80%~90% of maximum pressure value.
Colliery of the present invention tomography permeance property method for quantitatively evaluating, packer permeability test device and grouting device are unified, mainly by closed system (evaluation interval 9 that rubber stopper 8 that is provided with in valve 4, the boring 7 and rubber stopper are sealed) and water system (water tank 1 and water supply/pipeline 6 and water pump 2) and mensuration system (measure the flowmeter 3 of volume of water input, measure the pressure gauge 5 of hydraulic pressure) formation.Valve 4 one is closed, and water and gas just stop to move in the evaluation interval.Just after the water filling of level pressure power, the observed pressure time dependent rule that descends, and calculate hydrogeological parameter with these rules.Compare with water-pressurizing test method in the past, replaced the steady flow theory with the unsteady fluid flow theory in theory; During operation, increase the observation time variable,, can calculate the hydrogeological parameters such as infiltration coefficient, coefficient of pressure conductivity of subjects more near the site test condition.
Embodiment two: referring to Fig. 1.The colliery tomography permeance property method for quantitatively evaluating of present embodiment on the basis of embodiment one, has further proposed the concrete method for quantitatively evaluating of infiltration coefficient.Volume of water input when testing according to setting-out, geological condition in conjunction with distributed fault, geological condition when boring is crept into toward distributed fault and the recovery situation of drilling water level, provide an infiltration coefficient in advance and decide empirical value Kc, be that several infiltration coefficients are set out at the center again with this empirical value Kc then, utilize the unsteady state flow through porous medium differential equation and finite element method, in conjunction with the actual geologic condition of tomography, real data when creeping into and calculation of parameter go out the pressure of each infiltration coefficient in this evaluation interval and the relation in elapsed time, draw the P-T curve map of each infiltration coefficient, convert the Kc-T curve map then to, the pressure of the closed interval that determines of packer permeability test drops to the coefficient of permeability K t of the needed time T t correspondence of force value of a certain setting from maximum pressure value before reading from curve map, promptly obtains the infiltration coefficient of this evaluation interval.
Embodiment three: present embodiment further discloses the operation steps of colliery of the present invention tomography permeance property method for quantitatively evaluating in conjunction with example.As shown in Figure 1, the aperture of rubber stopper 8 lower ends length and boring at the bottom of boring 7 the hole can be set, for example 5.0m, 0.075m can be set at.
Volume of water input and injection pressure are 0MPa from the 0.5905MPa(effective pressure in the evaluation interval 9), 1.5905 MPa, 2.0905 MPa, 2.5905 MPa (effective pressure is 2 MPa) increase stage by stage, when the pressure in the evaluation interval 9 settled out along with the regular hour, flowmeter 3 is measured the volume of water input in per stage, and the pre-stage test method is consistent with Lv Rong method packer permeability test (seeing the water conservancy industry standard SL31-2003 of the People's Republic of China (PRC)).The pressure of later stage in evaluation interval just reaches under the situation of maximum injection pressure (2.5905 MPa) under the unmeasured situation of the injection rate IR of certain process stage water, stops the supply of water, sealing evaluation interval 9.In this experiment, it is 2.0MPa to 2.5905 MPa(effective pressures that injection pressure is set at from 0.5905 MPa (effective pressure is 0 MPa)).Then, the pressure in the evaluation interval after the sealing 9 is along with water little by little is penetrated in the distributed fault slowly step-down, the pressure in the evaluation of measuring interval from 2.5905 MPa descended 1.8 MPa(effective pressures 90%) required time Tt.So far just finished packer permeability test.
Evaluation method to infiltration coefficient elaborates below.At first, reply situation according to the geological condition of distributed fault (such as the mechanical property of tomography and drop etc.), the geological condition when boring is crept into toward distributed fault, drilling water level, with the volume of water input in setting-out when experiment in early stage etc. be basic, infer and an infiltration coefficient empirical value Kc, with this value is the center, with 10 2(m/s) amplitude is set maximal value and minimum value, maximal value and minimum value five equilibrium, on average is partitioned into several coefficient of permeability K c, such as, the value of experience coefficient of permeability K c is set at 5.0 * 10 -8(m/s), then maximal value is set at 1.0 * 10 -6(m/s), minimum value is set at 1.0 * 10 -9(m/s), with 0.5(m/s) amplitude division, set out 1.0 * 10 -9, 5.0 * 10 -9, 1.0 * 10 -8, 5.0 * 10 -8, 1.0 * 10 -7, 5.0 * 10 -7, 1.0 * 10 -6(m/s) 7 coefficient of permeability K c.
The pressure of each coefficient of permeability K c in evaluation interval 9 and the relation between the elapsed time, with unsteady state flow through porous medium fundamental differential formula and finite element method is the basis, with software for calculation or work out corresponding finite element program and obtain (with reference to Wei Ning, Li Jin, Fu Xudong, 2006 the 25th the 05th phases of volume of the numerical simulation rock mechanics of HIGH-PRESSURE INJECTION EXPERIMENT and engineering journal).Used analytic parameter, as evaluation interval length, boring radius, hydrostatic pressing is used actual value, fluid space (two dimension or three-dimensional), the radius of influence, the interval compressibility of evaluation object, the water storage coefficient is the value of suitably inferring according to field conditions.Injection pressure when the force value in the evaluation interval 9 can be used packer permeability test, the effective pressure in the time of also can using packer permeability test.
Calculate through computer software, in gained data input Excel, in computing machine, can draw the P-T curve map of each infiltration coefficient with Excel figure table function, as Fig. 3-A, B, C, D, E, F, G are that evaluation interval 9 interior pairing pressure of each infiltration coefficient and the relation between the elapsed time are calculated figure.Each coefficient of permeability K c, all show among the figure pressure along with the process of time step-down, it is different along with the difference of infiltration coefficient to drop to the used elapsed time Tc of certain force value, infiltration coefficient is more little, elapsed time is just long more, from each figure pressure from 2.5905 MPa reduce by 1.8 MPa(effective pressures 90%) the elapsed time Tc that is reduced to 0.7905 MPa reads, draw 7 groups of (Tc, Kc) reading is a horizontal ordinate with elapsed time Tc, and coefficient of permeability K c is an ordinate, as Fig. 2, this 7 group number-reading is showed with coordinate points in coordinate system, then these points are connected with curve, method of attachment is calculated with the general approximation method of least square method etc.Just can obtain drawing the K-T curve map.Computer analyzing computation process can begin in earlier stage at packer permeability test, and the analytical Calculation engineering also finished before packer permeability test finished.
Determine when from Fig. 2, reading packer permeability test then from the descend pairing coefficient of permeability K t of elapsed time Tt of 1.8 MPa of 2.5905 MPa, this value just can be used as the infiltration coefficient of evaluation interval 9.As shown in Figure 2, when the elapsed time Tt that determines was 700 seconds, then Dui Ying coefficient of permeability K t value was exactly 8.0 * 10 -8(m/s), this value is exactly the infiltration coefficient in the evaluation interval 9, according to this infiltration coefficient of trying to achieve, can determine injecting paste material and injection rate IR grouting mode, and just can directly implement the slip casting operation with the packer permeability test device at once.Because the packer permeability test scene does not need to do professional that perviousness estimates and special parsing software, has saved labour cost and cost of equipment, and setting-out experimentation and evaluation procedure time spent are short, are well suited for the characteristics of Coal Production.

Claims (4)

1. colliery tomography permeance property method for quantitatively evaluating, by water system the evaluation interval that seals is carried out the setting-out experiment, it is characterized in that: water system adopts the water pump and the pipeline of grouting device, to evaluation interval stage by stage level pressure power inject water, and improve injection pressure stage by stage, when reaching the injection water pressure of each stage setting, by the each volume of water input of cmf record, when water injection pressure reaches the hydraulic pressure in the piestic water water-bearing zone that is communicated with tomography when consistent, obtain maximum pressure value, stop to supply water, seal evaluation interval simultaneously, the pressure of measuring the closed interval drops to the needed time T t of force value of a certain setting from maximum pressure value, and the observed pressure P rule that T in time changes that descends is calculated the hydrogeological parameter of colliery tomography according to descend rule that T in time changes of pressure P then.
2. colliery according to claim 1 tomography permeance property method for quantitatively evaluating, it is characterized in that: the hydraulic pressure in the piestic water water-bearing zone that the injection pressure stage by stage of setting and maximum pressure value basis and tomography are communicated with is set, when injecting water stage by stage, in under the pressure stability in evaluation interval, measure the volume of water input in per stage by flowmeter; When the pressure in the evaluation interval under the unmeasured situation of the injection rate IR of certain process stage water, promptly reach maximum injection pressure, stop to supply water this moment, the sealing evaluation interval.
3. colliery according to claim 1 and 2 tomography permeance property method for quantitatively evaluating is characterized in that: the pressure of closed interval drops to the size of the force value of a certain setting from maximum pressure, is set at 80%~90% of maximum pressure value according to field condition.
4. colliery according to claim 3 tomography permeance property method for quantitatively evaluating, it is characterized in that: the volume of water input when testing according to setting-out, geological condition in conjunction with distributed fault, geological condition when boring is crept into toward distributed fault and the recovery situation of drilling water level, provide an infiltration coefficient in advance and decide empirical value Kc, be that several infiltration coefficients are set out at the center again with this empirical value Kc then, utilize the unsteady state flow through porous medium differential equation and finite element method, in conjunction with the actual geologic condition of tomography, real data when creeping into and calculation of parameter go out the pressure of each infiltration coefficient in this evaluation interval and the relation in elapsed time, draw the P-T curve map of each infiltration coefficient, convert the Kc-T curve map then to, the pressure of the closed interval that determines of packer permeability test drops to the coefficient of permeability K t of the needed time T t correspondence of force value of a certain setting from maximum pressure value before reading from curve map, promptly obtains the infiltration coefficient of this evaluation interval.
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CN103527179A (en) * 2013-10-28 2014-01-22 中国水电顾问集团中南勘测设计研究院有限公司 Drill-hole high-pressure water pump-in test loading system
CN106018234A (en) * 2016-05-19 2016-10-12 中国电建集团成都勘测设计研究院有限公司 Borehole based in-situ simple water injection test device and test method
CN107330220A (en) * 2017-07-20 2017-11-07 中国矿业大学(北京) Consider this coal seam concordant gas drilling design method of permeability anisotropy
CN109682950A (en) * 2019-02-11 2019-04-26 河海大学 A kind of method of determining disturbed belt non-linear flow seepage failure hydraulic slope droping value
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CN103527179A (en) * 2013-10-28 2014-01-22 中国水电顾问集团中南勘测设计研究院有限公司 Drill-hole high-pressure water pump-in test loading system
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CN106018234A (en) * 2016-05-19 2016-10-12 中国电建集团成都勘测设计研究院有限公司 Borehole based in-situ simple water injection test device and test method
CN107330220A (en) * 2017-07-20 2017-11-07 中国矿业大学(北京) Consider this coal seam concordant gas drilling design method of permeability anisotropy
CN107330220B (en) * 2017-07-20 2020-10-13 中国矿业大学(北京) Coal seam bedding gas drilling hole design method considering permeability anisotropy
CN109682950A (en) * 2019-02-11 2019-04-26 河海大学 A kind of method of determining disturbed belt non-linear flow seepage failure hydraulic slope droping value
CN109682950B (en) * 2019-02-11 2021-06-08 河海大学 Method for determining hydraulic slope value of fault zone nonlinear flow infiltration damage
CN113338896A (en) * 2021-08-05 2021-09-03 中国铁建重工集团股份有限公司 Drilling parameter debugging method for drill jumbo

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