CN105182412A - Detection method of coal mine underground reservoir coal pillar dam body earthquake safety - Google Patents

Detection method of coal mine underground reservoir coal pillar dam body earthquake safety Download PDF

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CN105182412A
CN105182412A CN201510604511.9A CN201510604511A CN105182412A CN 105182412 A CN105182412 A CN 105182412A CN 201510604511 A CN201510604511 A CN 201510604511A CN 105182412 A CN105182412 A CN 105182412A
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coal
dam body
underground reservoir
mine underground
coal mine
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顾大钊
张勇
刘晓丽
曹志国
董斌琦
郝兴辉
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Tsinghua University
China Shenhua Energy Co Ltd
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Tsinghua University
China Shenhua Energy Co Ltd
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Abstract

The present invention discloses a detection method of coal mine underground reservoir coal pillar dam body earthquake safety. The method comprises the following steps of 1: establishing a numerical value model for a to-be-detected coal mine underground reservoir; 2: utilizing a numerical value simulation method to analyze, primarily determining the possibly damaged positions Ai on a coal pillar dam body of the coal mine underground reservoir on an earthquake condition; 3: designing a similar material physical model according to a numerical value result in the step 2, and carrying out a vibration test on the similar material physical model; 4: obtaining the shearing stresses tau i of the damaged positions Ai according to a vibration test result in the step 3; 5: calculating the earthquake safety coefficients Ki of the damaged positions Ai. The method of the present invention can evaluate the seismic safety of the coal mine underground reservoir coal pillar dam body on the mine earthquake or earthquake condition, and can give out a quantitative evaluation result of the coal mine underground reservoir anti-seismic property by aiming at the structure of the coal mine underground reservoir, and combining the rock breaking theory, the numerical value simulation method and the physical model test.

Description

The detection method of coal mine underground reservoir coal column dam body earthquake safety
Technical field
The present invention relates to the technical field of comprehensive utilization of Mineral Engineering and hydraulic engineering, particularly relate to a kind of detection method of coal mine underground reservoir coal column dam body earthquake safety.
Background technology
China is lack of water country, and the improvement of shortage of water resources phenomenon to the national economic development and people's lives constitutes serious threat.Mine water unavoidably produces in progress of coal mining, and as a kind of water resource of preciousness, only the mine water that discharges every year of State owned coal mine is just up to 2,200,000,000 tons, and on average often exploiting a coal needs discharge 2 tons of waste water.On the one hand, the outer row of mine water, not only wastes a large amount of valuable water resource, and very easily forms serious environmental pollution to surrounding enviroment.On the other hand, western China is composed and is deposited abundant coal resources, but water resources shortage, make the further deterioration of mining area water and neighboring area short water supply, seriously constrained the normal production in mining area, be unfavorable for the coordinated development of resource and environment.Therefore be that conservation and utilization mine water resource and propose a kind of new version--coal mine underground reservoir, is connected to form reservoir dam by barrier pillar with artificial dam body, the rock mass space, goaf utilizing coal mining to be formed stores mine water and underground water.And in order to the Sustainable Exploitation that ensures mine and production, must ensure that coal mine underground reservoir is in the security of building and in operation process completely.
Coal mine underground reservoir safeguard technology under normal conditions and comparatively ripe, as analyzed reservoir Weak Parts for Stability according to coal mine underground reservoir actual conditions, arrange index of correlation monitoring sensor, the analytically key parameter such as seepage, water level, water quality, the water yield, dam body ess-strain of lower storage reservoir, by information-based monitoring technology, Real-Time Monitoring dam stability index; The analysis of base area lower storage reservoir Monitoring Data simultaneously, utilize automatic control technology, set up groundwater reservoir emergency guarantee technology, when the index such as the water yield, water level exceedes early warning, by equipment such as water drainage valves, reservoir running status is regulated, water is drained to sluicing space or is adjusted to other reservoirs, to ensure the safe operation of groundwater reservoir.
But under extreme conditions, as the safety evaluatio of coal mine underground reservoir when the shake of generation ore deposit or earthquake does not also have systematic research.The appraisal procedure that China Patent Publication No. is the shock resistance of the building disclosed in CN101074995A and application thereof, propose a kind of quake-resistant safety appraisal procedure of ground building building structure.And China Patent Publication No. is the earth and rockfill dam anti-seismic structure disclosed in CN204023511U for the earthquake resistant structure of high earth-rock dam in earthquake region disclosed in CN202989868U and China Patent Publication No., then it is the anti-seismic structure proposed for ground dam body.Compared with ground dam structure, the quake-resistant safety evaluation of coal mine underground reservoir is more complicated, is embodied in:
(1) dam structure on ground mainly considers the effect of hydraulic pressure and dam body self gravitation, and coal mine underground reservoir is also subject to the impact of terrestrial stress and rock pressure [in mine;
(2) primary structure of coal mine underground reservoir dam is barrier pillar, and compared with the Reinforced Concrete Materials that ground dam body is conventional, coal column Mechanical Properties of Materials are more difficult to determine;
(3) top, the effect of contraction of base plate on coal column dam body are the key factors affecting coal column safety of dam body, make the safety evaluatio of coal column dam body more difficult.
Therefore, the seismic safety evaluation method of earth construction is difficult to adapt to for groundwater reservoir.
Summary of the invention
The object of the invention is to overcome defect of the prior art, a kind of detection method of coal mine underground reservoir coal column dam body earthquake safety can assessing the seismic seeurity of coal mine underground reservoir coal column dam body under ore deposit shake or seismic condition is provided.
Technical solution of the present invention provides a kind of detection method of coal mine underground reservoir coal column dam body earthquake safety, comprises the steps: step 1: set up numerical model to coal mine underground reservoir to be detected; Step 2: utilize Analysis on Numerical Simulation Method, tentatively determines the failure position A that may be destroyed on the coal column dam body under seismic condition in described coal mine underground reservoir i(natural number of i>=1); Step 3: according to the numerical simulation result design analog material physical model in step 2, and vibration test is carried out to described analog material physical model; Step 4: draw failure position A described in each according to the vibration test result in step 3 ishear stress τ i; Step 5: calculate failure position A described in each iseismic safety COEFFICIENT K i.
Further, also step 6 is comprised the steps:: according to failure position A described in each idescribed seismic safety COEFFICIENT K i, draw the safety coefficient K of whole described coal column dam body always.
Further, also step 11 is comprised the steps: in described step 1: determine the geological layering in mining area, described coal mine underground reservoir place, each rock layer mechanics character, position, coal seam and height according to geology exploration data; The computer capacity of described numerical model is determined according to coal mining situation and described coal mine underground reservoir construction condition; Damping Boundary Conditions and the dynamic load load mode of described numerical model is determined according to seismic condition and each described rock layer mechanics character; Numerical simulation software is utilized to set up described numerical model and calculate.
Further, also step 21 is comprised the steps: in described step 2: determine the described failure position A on described coal column dam body according to Plastic Zone Distribution or stress intensity condition in the result of calculation of described numerical model i.
Further, also comprise the steps: step 31 in described step 3: the principle of similitude of structure based dynamic model test, preparation meets the analog material of testing requirements, and determines the size of described analog material physical model; Pre-establish suitable mould, and described analog material is built vibrate shaping to described mould, and stress monitoring instrument is placed in the assigned address in described mould; After described analog material intensity meets the demands, by being equipped with the described mold movement of described analog material on shaking table, to the seismic wave parameter that the input of described shaking table is specified, carry out vibration test with seismic condition that is virtually reality like reality; Monitoring Data is gathered by described monitoring instrument.
Further, also comprise the steps: step 41 in described step 4: by collect each described in failure position A ithe detection data at place are converted to corresponding described shear stress τ i.
Further, computationally secure COEFFICIENT K in the following way in described step 5 i: failure position A in described coal column dam body ithe shear stress that place allows is: τ is coal column dam body shear stress, and c is cohesive strength, for angle of internal friction, σ is normal stress; Failure position A in described coal column dam body ithe safety coefficient at place is:
Adopt technique scheme, there is following beneficial effect:
The present invention is undertaken simulating the failure position that may be destroyed by setting up numerical model, then by setting up analog material physical model, and vibration test is carried out to analog material physical model, finally draw the safety coefficient of each failure position.It is in conjunction with rock failure mechanism of rock theory, method for numerical simulation and physical experiments, around the damage-form of barrier pillar under seismic condition and failure criteria, the evaluation result of quantification more adequately can be provided to coal mine underground reservoir structural seismic performance, be conducive to the security assessing different earthquake or ore deposit shake Coal Under post dam body, have directive significance to the Security Construction of groundwater reservoir and operation.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the detection method of coal mine underground reservoir coal column dam body earthquake safety provided by the invention.
Embodiment
The specific embodiment of the present invention is further illustrated below in conjunction with accompanying drawing.
As shown in Figure 1, the detection method of a kind of coal mine underground reservoir coal column dam body earthquake safety that one embodiment of the invention provides, comprises the steps:
Step 1: numerical model is set up to coal mine underground reservoir to be detected;
Step 2: utilize Analysis on Numerical Simulation Method, tentatively determines the failure position A that may be destroyed on the coal column dam body under seismic condition in coal mine underground reservoir i(natural number of i>=1);
Step 3: according to the numerical simulation result design analog material physical model in step 2, and vibration test is carried out to analog material physical model;
Step 4: draw each failure position A according to the vibration test result in step 3 ishear stress τ i;
Step 5: calculate each failure position A iseismic safety COEFFICIENT K i.This failure position of the larger expression of K value is in when there is earthquake safer.
Detection method provided by the invention is mainly used in carrying out safety assessment to the coal column dam body in coal mine underground water ore deposit, the security of assessment coal column dam body when earthquake occurs.
First, by computer software, numerical model is set up to coal mine underground reservoir to be detected or to be assessed, in numerical model, embody each feature in coal mine underground reservoir, such as base plate, coal column dam body, rock crown layer etc.
Afterwards, utilize method for numerical simulation analysis, draw or tentatively determine the failure position A that may be destroyed on the coal column dam body under seismic condition in coal mine underground reservoir i(natural number of i>=1).Such as, after numerical simulation analysis, tentatively determine coal column dam body there are 5 positions, can be destroyed when earthquake occurs, it is respectively A 1, A 2, A 3, A 4and A 5.
Afterwards, according to above-mentioned numerical simulation result, design the analog material physical model similar to coal mine underground reservoir to be detected or to be assessed, and by shaking table, vibration test is carried out to analog material physical model, real situation when occurring with simulated earthquake in coal mine underground reservoir.
The analog material physical model that this place refers to is the model formed by equivalent material simulating.
Equivalent material simulating is that one is based upon on similarity theory basis, with the model expanded or reduce, goes to study the mechanical motion of corresponding prototype and a kind of experimental technique of other correlation properties.The method in mine, the field such as geology, water conservancy and building is widely used.In field of mining, the method has been widely used in such as measuring mine to press, and formation damage is migrated, the research of groundwater seepage and the problem such as stability of slope without circulating water.
Equivalent material simulating, according to Affected areas by mining, general simulation part subregion.Coal column dam body can be only simulated in the present invention.
Afterwards, each failure position A is drawn according to above-mentioned vibration test result ishear stress τ i.Such as, according to above-mentioned vibration test is carried out to analog material physical model after, draw failure position A 1, A 2, A 3, A 4and A 5the shear stress τ that place is corresponding 1, τ 2, τ 3, τ 4and τ 5.
Afterwards, then calculate each failure position A iseismic safety COEFFICIENT K i.This failure position of the larger expression of K value is in when there is earthquake safer.Such as, failure position A is calculated 1, A 2, A 3, A 4and A 5the seismic safety COEFFICIENT K that place is corresponding 1, K 2, K 3, K 4and K 5.And compare K respectively 1, K 2, K 3, K 4and K 5value or by the K value of above-mentioned each failure position with setting safety value compared with, this failure position of the larger expression of K value be in occur earthquake time safer, this failure position of the less expression of K value be in generation earthquake time be more easily destroyed.
To sum up, the present invention is undertaken simulating the failure position that may be destroyed by setting up numerical model, then by setting up analog material physical model, and vibration test is carried out to analog material physical model, finally draw the safety coefficient of each failure position.It is in conjunction with rock failure mechanism of rock theory, method for numerical simulation and physical experiments, around the damage-form of barrier pillar under seismic condition and failure criteria, the evaluation result of quantification more adequately can be provided to coal mine underground reservoir structural seismic performance, be conducive to the security assessing different earthquake or ore deposit shake Coal Under post dam body, have directive significance to the Security Construction of groundwater reservoir and operation.
Preferably, as shown in Figure 1, the detection method of this coal mine underground reservoir coal column dam body earthquake safety also comprises the steps:
Step 6: according to each failure position A iseismic safety COEFFICIENT K i, draw the safety coefficient K of whole coal column dam body always.K alwaysmode by getting minimum value draws, such as, is calculating failure position A 1, A 2, A 3, A 4and A 5the seismic safety COEFFICIENT K that place is corresponding 1, K 2, K 3, K 4and K 5afterwards, K always=min (K 1, K 2, K 3, K 4, K 5), thus draw the safety coefficient K of whole coal column dam body always, K alwayslarger expression whole coal column dam body is safer when there is earthquake.
Preferably, also comprise the steps: in step 1
Step 11: in order to make numerical model and actual conditions match, should according to the geological layering in mining area, geology exploration data determination coal mine underground reservoir place, each rock layer mechanics character, position, coal seam and height, the material parameter used with palpus in evaluation model;
According to the computer capacity of coal mining situation and coal mine underground reservoir construction condition determination numerical model; Computer capacity is usually centered by groundwater reservoir, and computation bound and groundwater reservoir dam body distance are about 1.0 ~ 2.0 times of reservoir length.
According to Damping Boundary Conditions and the dynamic load load mode of seismic condition and each rock layer mechanics character determination numerical model; In dynamical problem, can wave reflection be there is in computation bound and affect dynamic analysis result, therefore must be carried out the incident wave in absorbing boundary by Damping Boundary Conditions, specific practice be model normal direction and damper freely is tangentially set respectively thus realizes being absorbed into the object of ejected wave.In dynamic analysis can model internal node apply dynamic load come simulation material be subject to dynamic action under reaction, the dynamic load under the mode of input acceleration time-history curves usually can be adopted to carry out simulated earthquake condition.
Utilize numerical simulation software to set up numerical model and calculate.
When numerical modeling or when setting up numerical model, match to make numerical model and actual conditions, should according to the geologic prospect data in early stage, determine the geological layering in mining area, coal mine underground reservoir place, each rock layer mechanics character, position, coal seam and height, with the material parameter that must use in evaluation model (such as: highly, thickness, position, nature of ground etc.), thus its similar numerical model can be set up.
Again according to coal mining situation and coal mine underground reservoir construction condition, determine the computer capacity of numerical model, computer capacity is centered by groundwater reservoir, and the distance between computation bound and groundwater reservoir dam body is about 1.0 ~ 2.0 times of reservoir length.
Again according to seismic condition and each rock layer mechanics character, determine Damping Boundary Conditions and the dynamic load load mode of numerical model, finally utilize numerical simulation software set up numerical model as FLAC3D, ABAQUS etc. and calculate.
Preferably, also comprise the steps: in step 2
Step 21: according to the failure position A in Plastic Zone Distribution in the result of calculation of numerical model or stress intensity condition determination coal column dam body i, tentatively determine failure position A 1, A 2, A 3, A 4and A 5.Plastic Zone Distribution is show the region that stress meets yield criteria in simulation softward.Stress or the larger position of shear stress or exceed the position of the safety value of specifying, it more may be destroyed, and tentatively determines failure position.
Preferably, also comprise the steps: in step 3
Step 31: the principle of similitude of structure based dynamic model test, preparation meets the analog material of testing requirements, and determines the size of analog material physical model;
Pre-establish suitable mould, and analog material is built vibrate shaping to mould, and stress monitoring instrument is placed in the assigned address in mould;
After analog material intensity meets the demands, by being equipped with the mold movement of analog material on shaking table, to the seismic wave parameter that shaking table input is specified, carry out vibration test with seismic condition that is virtually reality like reality;
Monitoring Data is gathered by monitoring instrument.
This step is making and the experiment of analog material physical model.First, according to the principle of similitude of structural dynamic test, preparation meets suitable analog material, and determines the size of analog material physical model.
Then built by analog material and vibrate shaping to the mould pre-established, simultaneously install monitoring instrument in a mold, monitoring instrument is strain rosette, for the various data of Material Physics model similar during monitoring vibration.Analog material physical model is made up of mould and the analog material of building to model.
After analog material intensity meets the demands, the mold movement of analog material will be housed on shaking table, and to the seismic wave parameter (such as with reference to the various parameters of earthquake progression setting) that shaking table input is specified, vibration test is carried out with seismic condition that is virtually reality like reality, gather Monitoring Data by monitoring instrument simultaneously, and the signal data collected is converted to corresponding physical quantity, such as stress value etc.
Preferably, also comprise the steps: in step 4
Step 41: by each failure position A collected ithe detection data at place are converted to corresponding shear stress τ i.To carry out next step calculating to safety coefficient.
Preferably, computationally secure COEFFICIENT K in the following way in step 5 i:
Failure position A in coal column dam body ithe shear stress that place allows is: τ is coal column dam body shear stress, and c is cohesive strength, for angle of internal friction, σ is normal stress;
Failure position A in coal column dam body ithe safety coefficient at place is:
Comprehensive different failure position safety coefficient can assess the seismic seeurity of coal column dam body.
The detection method of coal mine underground reservoir coal column dam body earthquake safety provided by the invention can assess the seismic seeurity of coal mine underground reservoir coal column dam body under ore deposit shake or seismic condition.For coal mine underground reservoir structure, in conjunction with rock failure mechanism of rock theory, method for numerical simulation and physical experiments, around the damage-form of barrier pillar under seismic condition and failure criteria, coal mine underground reservoir structural seismic performance is provided to the evaluation result of quantification.
As required, above-mentioned each technical scheme can be combined, to reach best-of-breed technology effect.
Above-described is only principle of the present invention and preferred embodiment.It should be pointed out that for the person of ordinary skill of the art, on the basis of the principle of the invention, other modification some can also be made, also should be considered as protection scope of the present invention.

Claims (7)

1. a detection method for coal mine underground reservoir coal column dam body earthquake safety, is characterized in that, comprise the steps:
Step 1: numerical model is set up to coal mine underground reservoir to be detected;
Step 2: utilize Analysis on Numerical Simulation Method, tentatively determines the failure position A that may be destroyed on the coal column dam body under seismic condition in described coal mine underground reservoir i(natural number of i>=1);
Step 3: according to the numerical simulation result design analog material physical model in step 2, and vibration test is carried out to described analog material physical model;
Step 4: draw failure position A described in each according to the vibration test result in step 3 ishear stress τ i;
Step 5: calculate failure position A described in each iseismic safety COEFFICIENT K i.
2. the detection method of coal mine underground reservoir coal column dam body earthquake safety according to claim 1, is characterized in that, also comprise the steps:
Step 6: according to failure position A described in each idescribed seismic safety COEFFICIENT K i, draw the safety coefficient K of whole described coal column dam body always.
3. the detection method of coal mine underground reservoir coal column dam body earthquake safety according to claim 1, is characterized in that,
Also comprise the steps: in described step 1
Step 11: determine the geological layering in mining area, described coal mine underground reservoir place, each rock layer mechanics character, position, coal seam and height according to geology exploration data;
The computer capacity of described numerical model is determined according to coal mining situation and described coal mine underground reservoir construction condition;
Damping Boundary Conditions and the dynamic load load mode of described numerical model is determined according to seismic condition and each described rock layer mechanics character;
Numerical simulation software is utilized to set up described numerical model and calculate.
4. the detection method of coal mine underground reservoir coal column dam body earthquake safety according to claim 3, is characterized in that,
Also comprise the steps: in described step 2
Step 21: determine the described failure position A on described coal column dam body according to Plastic Zone Distribution or stress intensity condition in the result of calculation of described numerical model i.
5. the detection method of coal mine underground reservoir coal column dam body earthquake safety according to claim 1, is characterized in that,
Also comprise the steps: in described step 3
Step 31: the principle of similitude of structure based dynamic model test, preparation meets the analog material of testing requirements, and determines the size of described analog material physical model;
Pre-establish suitable mould, and described analog material is built vibrate shaping to described mould, and stress monitoring instrument is placed in the assigned address in described mould;
After described analog material intensity meets the demands, by being equipped with the described mold movement of described analog material on shaking table, to the seismic wave parameter that the input of described shaking table is specified, carry out vibration test with seismic condition that is virtually reality like reality;
Monitoring Data is gathered by described monitoring instrument.
6. the detection method of coal mine underground reservoir coal column dam body earthquake safety according to claim 5, is characterized in that,
Also comprise the steps: in described step 4
Step 41:
By collect each described in failure position A ithe detection data at place are converted to corresponding described shear stress τ i.
7. the detection method of coal mine underground reservoir coal column dam body earthquake safety according to claim 1, is characterized in that,
Computationally secure COEFFICIENT K in the following way in described step 5 i:
Failure position A in described coal column dam body ithe shear stress that place allows is: τ is coal column dam body shear stress, and c is cohesive strength, for angle of internal friction, σ is normal stress;
Failure position A in described coal column dam body ithe safety coefficient at place is:
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CN105631155A (en) * 2016-01-12 2016-06-01 昆明理工大学 Reservoir-induced earthquake probability calculation method
CN111208559B (en) * 2020-01-09 2022-04-01 中国地震灾害防御中心 Earthquake safety evaluation computing device and method
CN111208559A (en) * 2020-01-09 2020-05-29 中国地震灾害防御中心 Earthquake safety evaluation computing device and method
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CN114112694B (en) * 2020-08-31 2024-03-19 神华神东煤炭集团有限责任公司 Safety distance test device and method for distributed underground reservoir
CN114170779A (en) * 2021-12-03 2022-03-11 河北地质大学 Urban underground comprehensive pipe gallery earthquake resistance abnormity early warning system and method
CN114199491A (en) * 2021-12-15 2022-03-18 国家能源投资集团有限责任公司 Earthquake-resistant stability test evaluation device, test evaluation method, electronic device, and storage medium
CN117688659A (en) * 2024-02-04 2024-03-12 四川省内江水利电力勘察设计院有限公司 Seepage risk prediction method for deep coverage dam foundation diaphragm wall of reservoir dam
CN117688659B (en) * 2024-02-04 2024-04-12 四川省内江水利电力勘察设计院有限公司 Seepage risk prediction method for deep coverage dam foundation diaphragm wall of reservoir dam

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Application publication date: 20151223