CN110119574A - A kind of non linear fluid flow through porous medium system stability distinguishing method of filling coal mining water-resisting key strata - Google Patents
A kind of non linear fluid flow through porous medium system stability distinguishing method of filling coal mining water-resisting key strata Download PDFInfo
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- CN110119574A CN110119574A CN201910398609.1A CN201910398609A CN110119574A CN 110119574 A CN110119574 A CN 110119574A CN 201910398609 A CN201910398609 A CN 201910398609A CN 110119574 A CN110119574 A CN 110119574A
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Abstract
The invention discloses a kind of non linear fluid flow through porous medium system stability distinguishing methods of filling coal mining water-resisting key strata, first according to the rock physical and mechanic parameter of test area filling operation face mining geological conditions and water-resisting key strata, by constructing numerical simulator, research obtains different Full RatiosUnder the conditions of water-resisting key strata osmotic coefficient k, fit Full RatioWith the relational expression between water-resisting key strata osmotic coefficient k；It is tested to obtain the non-darcy factor-beta and osmotic coefficient k of water-resisting key strata rock failure process according to seepage tests, and fits the relational expression between osmotic coefficient k and non-darcy factor-beta；Finally use Full RatioOsmotic coefficient k and non-darcy factor-beta are represented, and is updated in the system stability distinguishing formula of beded rock mass non linear fluid flow through porous medium, Full Ratio is obtainedWith the relational expression between Assessing parameters Δ.Full Ratio is finally designed according to filling coal mining Practical Project parameterComputational discrimination factor Δ differentiates whether water-resisting key strata non linear fluid flow through porous medium system is stable.
Description
Technical field
The present invention relates to a kind of non linear fluid flow through porous medium system stability distinguishing methods of filling coal mining water-resisting key strata, especially
It is suitable for the non linear fluid flow through porous medium system stability distinguishing methods of water-bearing layer retrofilling coal mining water-resisting key strata.
Background technique
China's mine hydrogeology complicated condition, the coal resources reserves threatened by surface water body and underground reservoir are huge
Greatly.Correlation scholar mines about traditional caving method, under the surface water bodies such as filling coal mining and under water-bearing layer safe working side both at home and abroad
The theoretical research in face controls water flowing fractured zone maximum height still mainly based on control overlying mining rock water flowing fractured zone development height
Agensis is to top water body and water-bearing layer, so that there is no consider as the criterion for differentiating, controlling water body and water-bearing layer stability
Damage crack caused by the structure of each coal measures rock stratum and water isolating otherness whether seepage flow gushing water problem.In filling mining process
In, the obturation of preferable compactness can effectively carry overlying rock load, weaken the water producing fractures developmental pathway journey of water proof rock stratum
Degree builds good crack and repairs mining host rock environment.At this point, consider the mining crack evolution feature of water proof key rock stratum,
Whether under seepage field and stress field action, water-resisting key strata system is the non linear fluid flow through porous medium system of time-varying, occur after stabilization by compaction
Seepage flow unstability needs to carry out in-depth study and verifying, and single water flowing fractured zone development height can not be as scientific, accurate
Field evaluation index.Currently, the system stability distinguishing for filling coal mining water-resisting key strata non linear fluid flow through porous medium is a kind of not yet
Accurate method of discrimination.Therefore, seek a kind of non linear fluid flow through porous medium system of simple, easy, accurate filling coal mining water-resisting key strata
System Convenient stable criterion is for realizing that the safe working of coal resources under water-bearing layer is of great significance.
Summary of the invention
Technical problem: simple, quasi- object of the present invention is to aiming at the problems existing in the prior art, provide a kind of method of discrimination
The non linear fluid flow through porous medium system stability distinguishing method of true filling coal mining water-resisting key strata.
Technical solution: a kind of non linear fluid flow through porous medium system stability distinguishing method of filling coal mining water-resisting key strata, feature
It is based on mining engineering geological conditions information, the method combined using laboratory test with numerical simulation is enriched
RateWith the Assessing parameters Δ relational expression of water-resisting key strata non linear fluid flow through porous medium system stability, then filled according to test area
Coal mining engineering parameter is filled out, Full Ratio is designedComputational discrimination factor Δ, and then differentiate that water-resisting key strata non linear fluid flow through porous medium system is
No stabilization.The specific steps of which are as follows:
(1) test area filling coal mining working face mining geological conditions information is collected, and carries out water-resisting key strata rock mass and takes
Sample；
(2) standard pattern is made in the rock mass that sampling obtains, carries out physical mechanics and seepage characteristic is tested, obtains rock mass
Physical mechanics and percolation parameters；
(3) by building numerical simulator, research obtains different Full RatiosUnder the conditions of water-resisting key strata infiltration system
Number k, then fits Full RatioWith the relational expression between water-resisting key strata osmotic coefficient k；
(4) it is tested to obtain the non-darcy factor-beta and infiltration coefficient of water-resisting key strata rock failure process according to seepage tests
K, and fit the relational expression between osmotic coefficient k and non-darcy factor-beta；
(5) Full Ratio is usedOsmotic coefficient k and non-darcy factor-beta are represented, and is updated to beded rock mass non linear fluid flow through porous medium
System stability distinguishing formula in, obtain Full RatioWith the relational expression between Assessing parameters Δ.
(6) finally according to filling coal mining Practical Project parameter, i.e. design Full RatioComputational discrimination factor Δ, and then sentence
Whether other water-resisting key strata non linear fluid flow through porous medium system is stable.
The calculating formula of Assessing parameters Δ are as follows:
β=cki
Wherein, μ is dynamic viscosity, and h is water-resisting key strata thickness, ρ0For the density of water, P is engineering parameter hydraulic pressure；A, b system
Number passes through Full RatioObtained by matched curve between water-resisting key strata osmotic coefficient k；C, i coefficient by osmotic coefficient k with
Obtained by matched curve between non-darcy factor-beta.
Further, the physical mechanics of the rock mass and percolation parameters include each rock stratum: elasticity modulus, pressure resistance
Degree, Poisson's ratio, cohesive force, internal friction angle, bulk density, infiltration coefficient, porosity.
Further, the whether stable method of water-resisting key strata non linear fluid flow through porous medium system is differentiated in step (6) in turn are as follows: when
When Δ < 0, which stablizes；When Δ > 0, the water-resisting key strata non linear fluid flow through porous medium system is unstable
It is fixed.
The Full RatioVariation range be 15%~95%.
The utility model has the advantages that a kind of non linear fluid flow through porous medium system stability distinguishing side of filling coal mining water-resisting key strata of the invention
Method only need to determine the design Full Ratio of filling coal mining working face, just according to filling coal mining Practical Project parameter in practice
It can judge that the non linear fluid flow through porous medium system stability of water-resisting key strata, the method can be coal seam resource security under water-bearing layer according to equation
Exploitation provides theoretical reference.The method is simple and easy, at low cost, has wide applicability.
Detailed description of the invention
Fig. 1 is the non linear fluid flow through porous medium system stability distinguishing method flow diagram of filling coal mining water-resisting key strata of the invention；
Fig. 2 is that infiltration coefficient and Full Ratio of the invention change numerical simulation result matched curve figure；
Fig. 3 is the non-darcy factor and infiltration coefficient experimental results matched curve figure of the invention.
Specific embodiment
One embodiment of the present of invention is further described with reference to the accompanying drawing:
A kind of non linear fluid flow through porous medium system stability distinguishing method of filling coal mining water-resisting key strata, it is characterized in that with getter
Based on journey geological conditions information, the method combined using laboratory test with numerical simulation obtains Full RatioWith water proof
The Assessing parameters Δ relational expression of key stratum non linear fluid flow through porous medium system stability, then according to test area filling coal mining engineering
Parameter designs Full RatioComputational discrimination factor Δ, and then differentiate whether water-resisting key strata non linear fluid flow through porous medium system is stable.Its
Specific step is as follows:
(1) test area filling coal mining working face mining geological conditions information is collected, and carries out water-resisting key strata rock mass and takes
Sample；
(2) standard pattern is made in the rock mass that sampling obtains, carries out physical mechanics and seepage characteristic is tested, obtains rock mass
Physical mechanics and percolation parameters；
(3) by building numerical simulator, research obtains different Full RatiosUnder the conditions of water-resisting key strata infiltration system
Number k, then fits Full RatioWith the relational expression between water-resisting key strata osmotic coefficient k；
(4) it is tested to obtain the non-darcy factor-beta and infiltration coefficient of water-resisting key strata rock failure process according to seepage tests
K, and fit the relational expression between osmotic coefficient k and non-darcy factor-beta；
(5) Full Ratio is usedOsmotic coefficient k and non-darcy factor-beta are represented, and is updated to beded rock mass non linear fluid flow through porous medium
System stability distinguishing formula in, obtain Full RatioWith the relational expression between Assessing parameters Δ；
(6) finally according to filling coal mining Practical Project parameter, i.e. design Full RatioComputational discrimination factor Δ, and then sentence
Whether other water-resisting key strata non linear fluid flow through porous medium system is stable.
The Full RatioVariation range be 15%~95%.
Embodiment 1, by taking certain mine as an example
(1) test area filling coal mining working face mining geological conditions information is investigated, and carries out water-resisting key strata
Rock mass sampling；
(2) standard pattern is made in the rock mass that sampling obtains, carries out physical mechanics and seepage characteristic is tested, obtains water proof pass
The rock physics mechanics and percolation parameters of key layer, are shown in Table 1.
1 water-resisting key strata rock physics mechanics of table and percolation parameters
(3) dug up mine geological conditions and experiment test parameter according to test area filling coal mining working face, establish it is long × wide ×
A height of 200m × 100m × 80m numerical analysis model, the displacement of model surrounding bound level, bottom restraint vertical displacement, this structure
Relationship uses mole-coulomb model.
(4) by numerical simulation, different Full Ratio conditions are obtainedUnder, the osmotic coefficient k of water-resisting key strata, and by quasi-
Conjunction obtains relational expression between the two, as shown in Figure 2.
(5) by experiment test, the osmotic coefficient k and non-darcy factor-beta of water-resisting key strata rock failure process are obtained,
And relational expression between the two is obtained by fitting, as shown in Figure 3.
(5) Full Ratio is usedOsmotic coefficient k and non-darcy factor-beta are represented, and is updated to beded rock mass non linear fluid flow through porous medium
In system stability distinguishing formula, Full Ratio is obtainedWith the relational expression between Assessing parameters Δ, specifically:
(6) finally according to filling coal mining Practical Project parameter hydraulic pressure P be 2MPa, the density p of water0For 1000kg/m3, power
Viscosity, mu is 1.01 × 10-3Pas, water-resisting key strata differentiate that water-resisting key strata is non-linear with a thickness of 25m, computational discrimination factor Δ
The critical Full Ratio of osmotic systemEqual to 48%, i.e., seepage flow unstability when Full Ratio is less than 48%.
Claims (5)
1. a kind of non linear fluid flow through porous medium system stability distinguishing method of filling coal mining water-resisting key strata, characterized in that with getter
Based on journey geological conditions information, the method combined using laboratory test with numerical simulation obtains Full RatioWith water proof
The relational expression of the Assessing parameters Δ of key stratum non linear fluid flow through porous medium system stability, then according to test area filling coal mining work
Journey parameter designs Full RatioComputational discrimination factor Δ, and then differentiate whether water-resisting key strata non linear fluid flow through porous medium system is stable；
The specific steps of which are as follows:
(1) test area filling coal mining working face mining geological conditions information is collected, and carries out water-resisting key strata rock mass sampling；
(2) standard pattern is made in the rock mass that sampling obtains, carries out physical mechanics and seepage characteristic is tested, obtains the physics of rock mass
Mechanics and percolation parameters；
(3) by building numerical simulator, research obtains different Full RatiosUnder the conditions of water-resisting key strata osmotic coefficient k, so
After fit Full RatioWith the relational expression between water-resisting key strata osmotic coefficient k；
(4) it is tested to obtain the non-darcy factor-beta and osmotic coefficient k of water-resisting key strata rock failure process according to seepage tests, and
Fit the relational expression between osmotic coefficient k and non-darcy factor-beta；
(5) Full Ratio is usedRepresent osmotic coefficient k and non-darcy factor-beta, and the system for being updated to beded rock mass non linear fluid flow through porous medium
In stability distinguishing formula, Full Ratio is obtainedWith the relational expression between Assessing parameters Δ；
(6) finally according to filling coal mining Practical Project parameter, i.e. design Full RatioComputational discrimination factor Δ, and then differentiate water proof
Whether key stratum non linear fluid flow through porous medium system is stable.
2. a kind of system stability distinguishing side of filling coal mining water-resisting key strata non linear fluid flow through porous medium according to claim 1
Method, it is characterised in that: the calculating formula of Assessing parameters Δ are as follows:
Wherein, μ is dynamic viscosity, and h is water-resisting key strata thickness, ρ0For the density of water, P is engineering parameter hydraulic pressure.
3. a kind of system stability distinguishing side of filling coal mining water-resisting key strata non linear fluid flow through porous medium according to claim 1
Method, it is characterised in that: the physical mechanics of the rock mass and percolation parameters include each rock stratum: elasticity modulus, compression strength,
Poisson's ratio, cohesive force, internal friction angle, bulk density, infiltration coefficient, porosity.
4. a kind of system stability distinguishing side of filling coal mining water-resisting key strata non linear fluid flow through porous medium according to claim 1
Method, it is characterised in that: in step (6) and then differentiate the whether stable method of water-resisting key strata non linear fluid flow through porous medium system are as follows: when Δ <
When 0, which stablizes；When Δ > 0, the water-resisting key strata non linear fluid flow through porous medium system is unstable.
5. a kind of system stability distinguishing side of filling coal mining water-resisting key strata non linear fluid flow through porous medium according to claim 1
Method, it is characterised in that: the Full RatioVariation range be 15%~95%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362556A (en) * | 2020-11-13 | 2021-02-12 | 重庆大学 | Method for obtaining permeability coefficient continuous function of coal mine mining stable area |
| CN112765781A (en) * | 2020-12-30 | 2021-05-07 | 中铁二院工程集团有限责任公司 | Stratified rock mass destruction criterion and determination method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180314770A1 (en) * | 2016-04-29 | 2018-11-01 | China University Of Mining And Technology | Method for designing supporting parameters of transition support for mixed mining face of filling and fully-mechanized mining |
| CN109253931A (en) * | 2018-07-06 | 2019-01-22 | 中国矿业大学 | A kind of shale water barrier adopts the method for discrimination of dynamic stability |
-
2019
- 2019-05-14 CN CN201910398609.1A patent/CN110119574B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180314770A1 (en) * | 2016-04-29 | 2018-11-01 | China University Of Mining And Technology | Method for designing supporting parameters of transition support for mixed mining face of filling and fully-mechanized mining |
| CN109253931A (en) * | 2018-07-06 | 2019-01-22 | 中国矿业大学 | A kind of shale water barrier adopts the method for discrimination of dynamic stability |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362556A (en) * | 2020-11-13 | 2021-02-12 | 重庆大学 | Method for obtaining permeability coefficient continuous function of coal mine mining stable area |
| CN112362556B (en) * | 2020-11-13 | 2024-03-29 | 重庆大学 | Method for obtaining continuous function of permeability coefficient of coal mine mining stable region |
| CN112765781A (en) * | 2020-12-30 | 2021-05-07 | 中铁二院工程集团有限责任公司 | Stratified rock mass destruction criterion and determination method |
| CN112765781B (en) * | 2020-12-30 | 2022-07-29 | 中铁二院工程集团有限责任公司 | Stratified rock mass destruction criterion and determination method |
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