CN102243163B - Quantitative evaluation method for permeability of faults of coal mine - Google Patents
Quantitative evaluation method for permeability of faults of coal mine Download PDFInfo
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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
Technical field
The present invention relates to colliery hydrogeology field of engineering technology, particularly relate to a kind of rapid quantitatively evaluating method of permeance property of the distributed fault that in seam mining, is disclosed.
Background technology
The most complicated geological condition 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, the mine water inrush hazard prediction is still a difficult problem in the coal mining with control.According to statistics; The colliery has 80% gushing water accident all to occur near the component in fault structure zone, and coalfield experience repeated tectonic movements has 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 press the 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 during as exploitation whether directly through tomography or keep the foundation of barrier pillar, do not have concrete data to come the permeance property of evaluate fault.In the hydrogeology of colliery; Generally before coal mining; Explore period at geotechnical boring; Do the experiment of drawing water and confirm the hydrogeological parameter in each water-bearing zone in the colliery, release (storage) water coefficient S etc., do the experiment of drawing water to confirm the hydrogeological parameter of tomography to tomography seldom specially such as coefficient of permeability K, coefficient of pressure conductivity a and unit.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 property, can't instruct the coal mining engineering to handle.And draw water and test the length that expends time in, equipment and labour cost are high.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 confirm the hydrogeological parameter of the tomography that disclosed in the coal mining, selecting for use and expending time in fewly that packer permeability test artificial and that cost of equipment is low is proper.
The production unit of present China is the Lv Rong method packer permeability test of water conservancy and hydropower department execution particularly, be to be the basis to stablize the well stream theory, and packer permeability test lasts weak point, is astable well stream, thereby the infiltration coefficient error that Lv Rong method packer permeability test calculates is inevitable big.And underground water steady flow theory can not be estimated osmotic strength and infiltration, osmotic pressure damage or the infiltration of anisotropic distributed fault, the change in time and space of osmotic pressure stability.And; The tomography that can directly pass through in the general coal mining; Be 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 confirm 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 confirming 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 characteristic of packer permeability test principle and colliery tomography.
The technical scheme that the present invention adopted:
A kind of colliery tomography permeance property method for quantitatively evaluating carries out the setting-out experiment through water system to the evaluation interval that seals, and 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 that each stage sets; Through 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 water supply; 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 through 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; The geological condition when creeping into toward distributed fault and the recovery situation of drilling water level in conjunction with the geological condition of distributed fault, boring; Provide an infiltration coefficient empirical value Kc in advance; 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, calculate 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 conjunction with the actual geologic condition of tomography, real data and parameter when creeping into; In computing machine, draw the P-T curve map of each infiltration coefficient through 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 from curve map, reading 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, and the distributed fault infiltration coefficient is just confirmed at once, can be determined 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; It is theoretical to have replaced steady flow 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 at packer permeability test in earlier stage; The analytical Calculation engineering also finished before packer permeability test finished; The professional that perviousness is estimated need be in the packer permeability test scene, 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 carries out the setting-out experiment through water system to the evaluation interval 9 that seals; The observed pressure time dependent rule that descends, and calculate hydrogeological parameter according to the pressure time dependent rule that descends, water system adopts the water pump 2 and 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 that each stage sets; Through 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 water supply; 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 draws the P-T curve map of pressure and time, converts the Kc-T curve map then to; The pressure of from curve map, reading the closed interval drops to the corresponding coefficient of permeability K t of the needed time T t of force value of a certain setting from maximum pressure value, promptly obtains the infiltration coefficient of this evaluation interval.
The injection pressure of setting stage by stage and maximum pressure value can basis and the hydraulic pressure in the piestic water water-bearing zone of tomography connection 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 through 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 waters supply/pipeline 6 and water pump 2) and mensuration system (flowmeter 3 of mensuration volume of water input, the pressure gauge 5 of mensuration 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, it is theoretical to have replaced steady flow 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; The geological condition when creeping into toward distributed fault and the recovery situation of drilling water level in conjunction with the geological condition of distributed fault, boring; Provide an infiltration coefficient empirical value Kc in advance; 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; Go out the pressure of each infiltration coefficient in this evaluation interval and the relation in elapsed time in conjunction with the actual geologic condition of tomography, real data and calculation of parameter when creeping into, 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 corresponding coefficient of permeability K t of the needed time T t of force value of a certain setting from maximum pressure value before from curve map, reading, and promptly obtains the infiltration coefficient of this evaluation interval.
Embodiment three: present embodiment combines instance, further discloses the operation steps of colliery of the present invention tomography permeance property method for quantitatively evaluating.As shown in Figure 1, can set the aperture of rubber stopper 8 lower ends length and boring at the bottom of boring 7 the hole, for example can be set at 5.0m, 0.075m.
Volume of water input and injection pressure increase from 0.5905MPa (effective pressure is 0MPa), 1.5905 MPa, 2.0905 MPa, 2.5905 MPa (effective pressure is 2 MPa) stage by stage in the evaluation interval 9; 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, injection pressure is set at from 0.5905 MPa (effective pressure is 0 MPa) to 2.5905 MPa (effective pressure is 2.0MPa).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, and the pressure in the evaluation of measuring interval is from 2.5905 MPa, 1.8 MPa (effective pressure 90%) the required time Tt that descended.So far just accomplished packer permeability test.
Evaluation method in the face of infiltration coefficient elaborates down.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; Inferring an infiltration coefficient empirical value Kc, is the center with this value, 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 the amplitude division of 0.5 (m/s), 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; Use unsteady state flow through porous medium fundamental differential formula and finite element method to be the basis; With software for calculation or work out corresponding finite element program and obtain (with reference to Wei Ning; Li Jin all, Fu Xudong, the numerical simulation rock mechanics of HIGH-PRESSURE INJECTION EXPERIMENT and engineering journal 2006 the 25th the 05th phase of volume).Used analytic parameter, like 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, scheme the P-T curve map that table function can draw each infiltration coefficient with Excel; Like 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, and the elapsed time is just long more, reduces the elapsed time Tc that 1.8 MPa (effective pressure 90%) are reduced to 0.7905 MPa to pressure from 2.5905 MPa from each figure and reads; (Tc, Kc) reading are horizontal ordinate with elapsed time Tc to draw 7 groups; Coefficient of permeability K c is an ordinate, like Fig. 2, in coordinate system, shows this 7 group number-reading with coordinate points; Connect these points with curve then, 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 at packer permeability test in earlier stage, 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.Can know that by Fig. 2 when the elapsed time Tt that determines was 700 seconds, then corresponding 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 professional that perviousness estimates and special parsing software need not done in the packer permeability test scene, have saved labour cost and cost of equipment, and the setting-out experimentation lacks with the evaluation procedure time spent, is well suited for the characteristics of Coal Production.
Claims (2)
1. a colliery tomography permeance property method for quantitatively evaluating carries out the setting-out experiment through water system to the evaluation interval that seals, and 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, through 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; 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; The observed pressure P rule that T in time changes that descends, the volume of water input when test according to setting-out combines geological condition, the geological condition when the past distributed fault of holing creeps into and the recovery situation of drilling water level of distributed fault; Provide an infiltration coefficient empirical value Kc in advance; 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, go out the pressure of each infiltration coefficient in this evaluation interval and the relation in elapsed time in conjunction with the actual geologic condition of tomography, real data and calculation of parameter when creeping into; 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 corresponding coefficient of permeability K t of the needed time T t of force value of a certain setting from maximum pressure value before from curve map, reading, and promptly obtains the infiltration coefficient of this evaluation interval; The pressure of closed interval drops to the size of the force value of a certain setting from maximum pressure value, is set at 80%～90% of maximum pressure value according to field condition.
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 through flowmeter; When the pressure in the evaluation interval under the unmeasured situation of volume of water input, promptly reach maximum injection pressure, stop to supply water this moment, the sealing evaluation interval.
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| CN103163056B (en) * | 2013-03-15 | 2014-12-24 | 陕西煤业化工技术研究院有限责任公司 | Method for detecting mine hydrogeological conditions |
| CN103527179B (en) * | 2013-10-28 | 2016-07-06 | 中国电建集团中南勘测设计研究院有限公司 | A kind of HIGH-PRESSURE INJECTION EXPERIMENT 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 |
| 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 |
| 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 |
| CN110567854B (en) * | 2019-09-02 | 2022-07-01 | 冀中能源峰峰集团有限公司 | Water inflow prediction and calculation method based on hydrogeological model of adjacent mine after mine closing |
| CN112814647B (en) * | 2020-12-31 | 2023-01-31 | 临沂矿业集团菏泽煤电有限公司 | Method for determining high-pressure grouting pressure and grouting diffusion radius of thick unconsolidated formation ground |
| CN113190953B (en) * | 2021-03-10 | 2023-04-11 | 上海威派格智慧水务股份有限公司 | Method and system for evaluating water supply stability of secondary water supply equipment |
| CN113202459B (en) * | 2021-06-11 | 2022-02-15 | 中国矿业大学 | Method for predicting fault permeability by utilizing natural gamma logging of drill hole |
| CN113338896B (en) * | 2021-08-05 | 2021-11-02 | 中国铁建重工集团股份有限公司 | Drilling parameter debugging method for drill jumbo |
| CN113984630B (en) * | 2021-12-27 | 2022-03-18 | 中国石油大学(华东) | Device for simulating fluid seepage law under different fault block distribution modes |
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