CN109214135B - Local strong mine pressure control method for filling collaborative caving type fully-mechanized mining face transition region - Google Patents
Local strong mine pressure control method for filling collaborative caving type fully-mechanized mining face transition region Download PDFInfo
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Abstract
The invention discloses a local strong mine pressure control method for a filling collaborative caving type fully-mechanized mining face transition region, which determines specific fillingA scheme; acquiring density parameters of the solid filling material; calculating and filling the length L of the fully mechanized mining face with the collaborative collapseGeneral (1)(ii) a Calculating the length L of the filling segmentCharging deviceAnd length L of the collapsed segmentCollapse(ii) a Acquiring physical and mechanical parameters of coal and rock masses; constructing a filling collaborative caving type fully-mechanized mining face mine pressure display calculation model; obtaining a relational expression of the average stress concentration coefficient K in the high stress influence range S; determining the number N of local reinforced supports and the reinforced support strength P in the transition region by combining with actual engineering quality parametersFor treating. The method is simple and easy to implement, has high accuracy, realizes stable transition of the filling and caving fully-mechanized coal mining face filling section and caving section mine pressure display, further enriches the filling coal mining theory, enlarges the application range of filling coal mining, and has wide practicability.
Description
Technical Field
The invention relates to the technical field of strong mine pressure control of a coal face transition region, in particular to a local strong mine pressure control method of a filling collaborative caving type fully-mechanized face transition region.
Background
The filling of the traditional full-face filling working face and the coal mining working procedure are mutually interfered, so that the filling efficiency and the productivity are low, and the high-yield and high-efficiency requirements of modern mines are difficult to meet. Based on the filling efficiency and the capacity requirement, a filling collaborative collapse type fully-mechanized mining technical method is designed. As shown in figure 3, the filling collaborative caving type fully-mechanized coal mining face integrates and arranges the filling section (1) and the caving section (2) in the same working face, thereby not only preserving the filling capability, but also improving the productivity of the working face, and effectively coordinating and improving the filling and coal mining efficiency. The front parts of the filling section (1) and the caving section (2) share one set of coal mining equipment to complete a coal mining process, and the filling section directly fills solid wastes such as gangue and coal ash into a goaf of the filling section (1) through a bottom-discharge scraper conveyor (11) suspended at the rear part of a filling coal mining hydraulic support (4) to achieve the aims of consuming the solid wastes such as the gangue and the coal ash and controlling rock stratum movement and the like. The mining pressure display difference of the filling section (1) and the caving section (2) of the filling collaborative caving type fully-mechanized coal mining face is obvious, and a local small-range strong mining pressure display transition area (3) exists between the filling section and the caving section. The basic frame type of the hydraulic support adopted by the support of the transition area (3) and the filling section (1) is the same, but the mine pressure manifestation intensity degree of the transition area (3) is obviously higher than that of the filling section (1), so that a control thought for pertinently improving the support strength P of the hydraulic support (5) in the transition area according to the local high stress influence range S and the stress concentration coefficient K of the transition area (3) is provided. At present, aiming at an effective prediction method that a local high stress influence range S and a stress concentration coefficient K of a filling collaborative caving type fully-mechanized mining face transition region (3) do not have a system, research on influence characteristics of filling rate eta and filling caving ratio V (ratio of filling section length to caving section length) engineering main control factors on local strong mine pressure of the filling collaborative caving type fully-mechanized mining face transition region (3), the high stress influence range and the stress concentration degree of the transition area (3) can be accurately predicted, the number N of the hydraulic supports (5) in the transition area and the reinforcing support strength P of the supports are accurately designed and arranged, the method can provide reference for the design of local strong mine pressure reinforcement support of the filling collaborative caving type fully-mechanized mining face, realize stable transition of mine pressure display of a filling section and a caving section of the filling collaborative caving type fully-mechanized mining face, further enrich the filling coal mining theory, and enlarge the application range of filling coal mining.
Disclosure of Invention
The invention aims to: the invention aims to provide a local strong mine pressure control method for a transition region of a filling collaborative caving type fully-mechanized mining face, which is simple and accurate.
The technical scheme adopted by the invention is as follows:
a local strong mine pressure control method for a filling collaborative caving type fully mechanized mining face transition region comprises the following steps:
1) determining a specific filling scheme according to the filling purpose of the filling collaborative caving type fully-mechanized mining face, and acquiring density parameters of solid filling materials in different filling states through experiments;
2) design filling synergistic collapse type fully-mechanized mining face yield T according to mine productivity1Calculating the length L of the filling synergetic caving type fully mechanized mining faceGeneral assembly；
3) According toDesigned filling quantity T of solid filling material2Calculating the length L of the filling segmentCharging deviceAnd length L of the collapse section (2)Collapse；
4) Performing mechanical characteristic parameter test on the coal rock stratum in the filling collaborative caving type fully-mechanized mining area to obtain the physical and mechanical parameters of the coal rock mass, and adopting FLAC3DConstructing a filling collaborative caving type fully-mechanized mining face mine pressure display calculation model by using numerical simulation software;
5) based on First Optimization multiple regression analysis, obtaining a relational expression of a filling rate eta, a filling collapse ratio V factor, a filling collaborative collapse type fully-mechanized mining face transition region high stress influence range S and an average stress concentration coefficient K in the high stress influence range S;
6) Finally, calculating the high stress influence area range S of the filling collaborative collapse type fully mechanized mining face transition area by combining the actual engineering quality parameters1And the average stress concentration coefficient K of overburden rock1Finally determining the number N of local reinforcing brackets and the reinforcing support strength P in the transition areaFor treating。
In a further development of the invention, in step 1),
a. determining a filling scheme according to a filling purpose of consuming solid wastes or controlling rock stratum movement of the filling cooperative caving type fully-mechanized mining face, and correspondingly selecting a natural blanking filling or dense filling scheme;
b. the density of solid filling material is loose apparent density rho in natural blanking1Obtained through a density test; the compacted density of the solid filling material is rho when the solid filling material is densely filled2And obtaining the coal gangue through gangue compaction experiment test.
According to a further improvement scheme of the invention, in the step 2), the filling synergistic caving type fully-mechanized mining face yield T is designed according to the mine productivity requirement1Calculating the length L of the filling collaborative caving type fully-mechanized mining face by combining the related engineering parameters of the filling collaborative caving type fully-mechanized mining faceGeneral assembly：
In the formula：LPush awayFilling the trend propulsion length of the collaborative collapse type fully mechanized mining face;
m-filling synergistic caving type fully-mechanized mining face average mining height;
ρCoal (coal)-coal density.
According to a further improvement of the invention, in the step 3), the filling quantity T is designed according to the solid filling material of the filling synergetic caving type fully-mechanized mining face2Testing the density rho of the solid filling material by combining the filling scheme, and calculating the length L of the filling sectionCharging (CN)And length L of the collapsed segmentCollapseLength L of filling segment under different filling scheme statesCharging deviceRespectively according to the following formula:
a. when naturally blanking and filling:
in the formula, H1-the height of the naturally falling and stacking of the solid filling material;
H2the distance between the lower end of the discharge hole of the bottom-discharge scraper conveyor and the top plate is short;
ρ1-bulk apparent density of the solid fill material;
b. when the material is densely filled:
in the formula, H3-a filler material unlanded height;
H4-advance sinking of the top plate;
ρ2-compacting the density of the solid filling material during compaction filling;
length L of caving segmentCollapseTotal length L of fully mechanized mining faceGeneral assemblyAnd length of filling sectionDegree LCharging deviceThe difference between:
according to a further improvement scheme of the invention, in the step 4), a mechanical characteristic parameter test of the coal rock stratum of the filling collaborative caving type fully-mechanized mining area is carried out to obtain a physical mechanical parameter of the coal rock stratum, and the geometric parameter of the filling collaborative caving type fully-mechanized mining surface is combined to pass through the FLAC 3DAnd (3) three-dimensional numerical simulation software is used for constructing a filling collaborative caving fully-mechanized mining face mine pressure display numerical analysis model.
In a further development of the invention, in step 5),
c. total length L of fixed filling collaborative collapse type fully mechanized mining faceGeneral (1)And the average mining height M parameter is unchanged; firstly, simulating a overburden stress distribution rule under the conditions that a filling-collapsing ratio V is not changed and a filling rate eta is changed; simulating the stress distribution rule of the covering rock of the filling collaborative caving fully-mechanized mining face under the conditions that the filling rate eta is unchanged and the filling collapse ratio V is changed;
d. defining a region with a vertical stress value of overlying rock of a filling collaborative caving type fully-mechanized mining face transition region being more than or equal to 1.3 times of the average value of the vertical stress of the overlying rock of a filling section as a high stress influence range S, and determining the high stress influence range S of the filling collaborative caving type fully-mechanized mining face transition region under the conditions of different filling rates eta and filling caving ratios V based on a simulation result;
e. on the basis of a numerical simulation analysis result, performing multiple regression by using First Optimization statistical analysis software to obtain a relational expression S (eta, V) of a filling rate eta, a filling-collapsing ratio V and a high stress influence range S of a transition region;
f. defining an average stress concentration K = σ in the high stress influence region S of the transition region 2/σ1Where σ is1Is the average stress value, sigma, of the overlying rock in the high stress influence range S of the transition region2The average stress of overlying strata of the filling section is obtained; analyzing the average stress concentration coefficient K value of the high stress influence range of the transition region under the conditions of different filling rates eta and filling-collapsing ratios V based on the numerical simulation result;
g. on the basis of a numerical simulation analysis result, a relational expression K (eta, V) of the filling rate eta, the filling-collapsing ratio V and the average stress concentration coefficient K in the high stress influence range S of the transition region is obtained by multivariate regression by adopting First Optimization statistical analysis software.
In a further development of the invention, in step 6),
filling rate eta of fully mechanized face with collaborative collapse according to actual filling1And charge-collapse ratio V1Substituting the relational expressions S (eta, V) and K (eta, V) to calculate the high stress influence area range S of the filling synergetic caving type fully mechanized mining face transition area1And the average stress concentration coefficient K of overburden rock1(ii) a Determining the number N of local reinforced supports and the reinforced support strength P in the transition region according to the following formulaFor treating：
In the formula: n-the smallest positive integer greater than or equal to N;
f is the center distance between adjacent hydraulic supports;
in the formula: pCharging deviceDesign support strength P of filling segment filling coal mining hydraulic support Charging (CN)。
The invention further improves the scheme that the variation range of the filling rate eta is 40-55% during natural blanking and filling; the variation range during dense filling is 55-85%.
The invention has the beneficial effects that:
according to the local control design method for the strong mine pressure in the transition region of the filling collaborative caving type fully-mechanized mining face, in actual application, the high mine pressure in the transition region can be calculated according to a regression equation by only determining the filling scheme of the filling collaborative caving type fully-mechanized mining face, determining the density of solid filling materials in different filling schemes according to experiments and establishing a numerical simulation calculation model by combining related engineering parametersThe stress influence range S and the average stress concentration coefficient K are calculated to determine the number N of local reinforced support supports and the support strength P in the transition areaCharging (CN)The method provides reference and theoretical guidance for local control design of strong mine pressure in the transition area of the filling collaborative caving type fully-mechanized mining face. The design method is simple and easy to implement, has high accuracy, realizes stable transition of the filling and caving fully-mechanized coal mining face filling section and caving section mine pressure display, further enriches the filling coal mining theory, enlarges the application range of filling coal mining, and has wide practicability. The method can provide reference for the design of local strong mine pressure reinforcement support in the transition region of the filling collaborative caving type fully-mechanized mining face, realize stable transition of mine pressure display of the filling section and the caving section of the filling collaborative caving type fully-mechanized mining face, further enrich the filling coal mining theory, and enlarge the application range of filling coal mining.
Description of the drawings:
FIG. 1 is a schematic diagram of filling and caving fully-mechanized coal mining dense filling in cooperation with filling.
Fig. 2 is a schematic diagram of filling and caving cooperative fully-mechanized mining natural blanking filling.
Fig. 3 is a layout diagram of the filling collaborative caving type fully-mechanized mining face system.
Fig. 4 is a filling collaborative caving type fully-mechanized mining numerical calculation model diagram.
FIG. 5 is a graph of the impact of filling in cooperation with caving in of the present invention on the high stress in the transition region.
Fig. 6 is a graph of the influence range of high stress in the filling-synergetic caving type comprehensive surface filling-caving ratio-transition region of the invention.
FIG. 7 is a graph of filling rate-average stress concentration coefficient of the filling-synergistic caving-type integrated surface of the present invention.
FIG. 8 is a graph of filling-collapsing ratio-average stress concentration coefficient of the filling-collapsing integrated surface of the present invention.
FIG. 9 is a table of physical mechanical parameters of coal-rock mass.
FIG. 10 is a table of fullness η versus collapse ratio V.
FIG. 11 is a table of mathematical parameters defining a high stress affected zone in which the range in which the value of the overburden vertical stress in the transition zone is greater than or equal to 1.3 times or more the average value of the overburden vertical stress in the filling section is greater than the average value.
FIG. 12 is a graph defining the high stress influence region S in the transition region with the mean stress concentration K = σ 2/σ1In the case of (2), a table of relevant mathematical statistical parameters.
Fig. 13 is a flow chart of a scheme of the present invention.
In the figure, 1, filling segment; 2. a collapse section; 3. a transition region; 4. filling a coal mining hydraulic support; 4. a transition zone hydraulic support; 6. traditional fully mechanized mining hydraulic supports; 7. a coal mining machine; 8. a waste rock conveying belt; 9. a movable gangue transfer machine; 10. a lifting platform; 11. a bottom discharge scraper conveyor; 12. a scraper conveyor; 13. a coal conveying belt; 14. a waste rock blocking plate; 15. and a tamping mechanism.
The specific implementation mode is as follows:
an embodiment of the present invention is further described below with reference to the accompanying drawings:
example 1
As shown in fig. 13, taking a mine filling collaborative caving type fully mechanized mining face as an example, the specific implementation steps are as follows:
1）
a. the filling and collaborative collapse type fully-mechanized mining can select two filling schemes of dense filling and natural blanking filling according to different filling purposes, as shown in figures 1 and 2.
b. The purpose of filling the fully mechanized mining face in a certain mine filling and collaborative collapse mode is to consume waste rock, natural blanking filling is selected as a filling mode, the waste rock in the goaf falls from a discharge opening of a bottom-discharge scraper conveyor 11 to the goaf for natural blanking and accumulation, and the loose apparent density rho of the waste rock is tested through field sampling 1It was 1.84t/m 3. The filling collaborative collapse type fully mechanized mining face is arranged as shown in figure 3.
2) According to the mine productivity, the filling and caving cooperative fully mechanized mining face yield T is designed1At 95Mt, calculating the length L of the filling collaborative caving type fully-mechanized face by the following formulaGeneral (1)To facilitate computation and layout data rounding:
in the formula, the average mining height M of the filling collaborative caving type fully-mechanized mining face is 3.2M; length of advance LPushing deviceTaking 1000 m; coal density ρCoal (coal)Take 1.35t/m3；
3) Design of gangue filling material quantity T according to filling synergistic caving type fully-mechanized mining face2The length L of the filling section 1 of the filling collaborative caving type fully-mechanized mining face is calculated by the following formula in combination with other parameters of related engineeringCharging device。
In the formula, the distance H between the lower end of a discharge hole of a bottom-discharge scraper conveyor and a top plate2Taking 0.9 m;
4) and (3) coring the coal rock mass drill hole in the filling collaborative caving type fully-mechanized mining face mining area, testing the physical and mechanical properties of the coal rock mass drill hole in a laboratory, and obtaining the physical and mechanical parameters of the coal rock mass, wherein the result is shown in a table 1 in a figure 9. According to the geological parameters of the filling collaborative collapse type fully-mechanized mining face engineering and the physical and mechanical parameters of the coal rock mass, the FLAC is adopted3DThe numerical simulation software builds a numerical analysis computational model, as shown in fig. 4. The size of the model is 400 multiplied by 300 multiplied by 130m, the boundary conditions are that the freedom degree in the horizontal direction is restrained at the periphery, the bottom surface of the model is fixed, and the horizontal and vertical freedom degrees are restrained. The part which is not laid on the upper part of the model is loaded with the compensating stress of 22.5MPa according to the corresponding thickness, and the constitutive relation adopts a molar-coulomb model.
5）
c. Total length L of fixed filling collaborative collapse type fully mechanized mining faceGeneral (1)220M, and the mining height M is 3.2M. First simulation scheme
The filling-collapsing ratio V is not changed, and the overburden stress distribution rule is realized under the condition of changing the filling rate eta; re-simulation scheme
The concrete simulation scheme of the overburden stress distribution rule under the conditions that the filling rate eta is unchanged and the filling-collapse ratio V is changed is shown in a table 2 in a figure 10.
d. Defining the range of the vertical stress value of the overburden rock of the transition region 3 which is more than or equal to 1.3 times of the average vertical stress value of the overburden rock of the filling section 1 as a high stress influence region, and determining the range value S of the high stress influence region of the transition region under the conditions of different filling rates eta and different caving ratios V based on the numerical simulation result, wherein the simulation result is shown in fig. 5 and 6.
e. On the basis of a numerical simulation analysis result, adopting First Optimization statistical analysis software, and performing multiple regression to obtain a relational expression S (eta, V) of a filling rate eta, a filling-collapse ratio V and a high stress influence area range S of a transition area 3, wherein the specific expression is as follows:
S（η、V）=0.495η+2.326V+2.986。
the related mathematical statistical parameters are shown in Table 3 of FIG. 11, R is the correlation coefficient, R2To determine the coefficients, RMSE is mean square error and SSE is the sum of squared residuals, the regression model is statistically significant as can be seen in table 3 of fig. 11.
f. Defining a transition region 3 high stress influence range S mean stress concentration coefficient K = sigma2/σ1Where σ is1Mean stress of overburden, σ, in the high stress influence region S of the transition zone 32The average stress of the overburden rock of the filling section 1 is shown. The simulation protocol is the same as table 2 in fig. 10, and based on the numerical simulation results, the values of the high stress influence ranges S average stress concentration coefficients K of the transition region 3 under the conditions of different filling rates η and collapse ratios V are analyzed, and the analysis results are shown in fig. 7 and fig. 8.
g. On the basis of a numerical simulation analysis result, adopting First Optimization statistical analysis software, and performing multiple regression to obtain a relational expression K (eta, V) of the fullness rate eta, the filling-collapsing ratio V and the average stress concentration coefficient K in the high stress influence range S of the transition region 3, wherein the specific expression is as follows:
K（η、V）= -0.083η+1.059 V+0.775
the related mathematical statistical parameters are shown in Table 4 of FIG. 12R is a correlation coefficient, R2To determine the coefficients, RMSE is the mean square error and SSE is the sum of the squares of the residuals, and the regression model is statistically significant as can be seen from the table.
6) Actual filling rate eta of certain mine filling collaborative collapse type fully-mechanized mining face engineering1=55%, charge/discharge ratio V1= 120: 100, substituting the relational expressions S (eta, V) and K (eta, V) to calculate the high stress influence area range S of the transition area 3 1=4.94m, mean stress concentration factor K in the high stress influence range S1= 1.230. The number N of local reinforced supports and the strength P of the reinforced support in the transition area are determined by the following formulasFor treating：
In the formula: n is the smallest positive integer which is greater than or equal to N;
f, taking the center distance of adjacent hydraulic supports to be 1.5 m;
in the formula: p isCharging (CN)Design support strength of hydraulic support for filling coal mining at filling section, and taking PCharging device=0.84MPa；
The supporting strength of the hydraulic support of the transition section in the transition region 3 of the filling collaborative caving type fully-mechanized mining face is 1.04MPa, and the number of the supports is 4.
Claims (8)
1. A local strong mine pressure control method for a filling collaborative caving type fully mechanized mining face transition region is characterized by comprising the following steps:
1) determining a specific filling scheme according to the filling purpose of the filling synergistic caving type fully-mechanized mining face, and acquiring density parameters of solid filling materials in different filling states through experiments;
2) filling and collaborative collapse type fully mechanized mining face yield T designed according to mine productivity1Calculating the length L of the filling synergetic caving type fully mechanized mining faceGeneral assembly；
3) Designing filling quantity T according to solid filling materials2Calculating the length L of the filling segmentCharging deviceAnd length L of the collapsed segmentCollapse；
4) Performing mechanical characteristic parameter test on the coal rock stratum in the filling collaborative caving type fully-mechanized mining area to obtain the physical and mechanical parameters of the coal rock mass, and adopting FLAC 3DConstructing a filling collaborative caving type fully-mechanized mining face mine pressure manifestation calculation model by using numerical simulation software;
5) obtaining a relational expression of a filling rate eta, a filling-caving ratio V factor, a filling-collaborative caving fully-mechanized mining face transition area high stress influence range S and an average stress concentration coefficient K in the high stress influence range S based on First Optimization multiple regression analysis;
6) finally, calculating the high stress influence area range S of the filling collaborative collapse type fully mechanized mining face transition area by combining the actual engineering quality parameters1And the average stress concentration coefficient K of overburden rock1Finally determining the number N of local reinforcing brackets and the reinforcing support strength P in the transition areaFor treating。
2. The method for controlling the local strong mine pressure of the transition region of the filling collaborative caving type fully mechanized mining face according to claim 1, characterized in that: in the step 1) of the method, the step,
a. determining a filling scheme according to a filling purpose of consuming solid wastes or controlling rock stratum movement of the filling collaborative caving type fully-mechanized mining face, and correspondingly selecting a natural blanking filling or dense filling scheme;
b. the density of solid filling material is loose apparent density rho in natural blanking1Obtained through a density test; the compacted density of the solid filling material is rho during compact filling2And testing and obtaining the waste rock compaction test.
3. The method for controlling the local strong mine pressure of the transition region of the filling collaborative caving type fully mechanized mining face according to claim 1, characterized in that: in the step 2), according to the requirement of the mine productivity, the filling collaborative caving type fully-mechanized mining face yield T is designed1Combining with the related engineering parameters of the filling collaborative caving type fully-mechanized mining face, calculating the filling synergy by the following formulaLength L of caving fully-mechanized mining faceGeneral (1)：
In the formula: l is a radical of an alcoholPushing deviceFilling the trend propulsion length of the collaborative collapse type fully mechanized mining face;
m-filling collaborative caving type fully-mechanized mining face average mining height;
ρcoal (coal)-coal density.
4. The method for controlling the local strong mine pressure of the transition area of the filling collaborative caving type fully-mechanized mining face according to claim 1, is characterized in that: in the step 3), the filling quantity T is designed according to the filling synergistic collapse type fully-mechanized mining face solid filling material2Testing the density rho of the solid filling material by combining the filling scheme, and calculating the length L of the filling sectionCharging deviceAnd length L of the collapsed segmentCollapseLength L of filling segment under different filling scheme statesCharging deviceRespectively according to the following formula:
a. when naturally blanking and filling:
in the formula, H1-the height of the naturally falling and stacking of the solid filling material;
H2the distance between the lower end of the discharge hole of the bottom-discharge scraper conveyor and the top plate is short;
ρ1-bulk apparent density of the solid fill material;
b. when the filling is dense:
in the formula, H3-the height of the non-abutting top of the filling material;
H4-advance sinking of the top plate;
ρ2-compacting density of the solid filling material during compaction filling;
length L of caving segmentCollapseTotal length L of fully mechanized mining faceGeneral assemblyLength L of and filling sectionCharging deviceThe difference between:
5. the method for controlling the local strong mine pressure of the transition area of the filling collaborative caving type fully-mechanized mining face according to claim 1, is characterized in that: in the step 4), a mechanical characteristic parameter test of the coal rock stratum of the filling collaborative caving type fully-mechanized mining area is carried out to obtain a physical mechanical parameter of the coal rock mass, and the geometric parameter of the filling collaborative caving type fully-mechanized mining face is combined to pass through the FLAC3DAnd (3) three-dimensional numerical simulation software is used for constructing a filling collaborative caving type fully-mechanized mining face mine pressure display numerical analysis model.
6. The method for controlling the local strong mine pressure of the transition area of the filling collaborative caving type fully-mechanized mining face according to claim 1, is characterized in that: in the step 5), the step of processing the raw material,
c. total length L of fixed filling co-caving type fully mechanized mining faceGeneral assemblyAnd the average mining height M parameter is unchanged; firstly, simulating a overburden stress distribution rule under the conditions that a filling-collapsing ratio V is not changed and a filling rate eta is changed; simulating the stress distribution rule of the covering rock of the filling collaborative caving fully-mechanized mining face under the conditions that the filling rate eta is unchanged and the filling collapse ratio V is changed;
d. Defining an area with a vertical stress value of overlying rocks of the filling collaborative caving type fully-mechanized mining face transition area more than or equal to 1.3 times of the average value of the vertical stress of the overlying rocks of the filling section as a high stress influence range S, and determining the high stress influence range S of the filling collaborative caving type fully-mechanized mining face transition area under the conditions of different filling rates eta and filling caving ratios V based on a simulation result;
e. on the basis of a numerical simulation analysis result, performing multiple regression by using First Optimization statistical analysis software to obtain a relational expression S (eta, V) of a filling rate eta, a filling-collapse ratio V and a high stress influence range S of a transition region;
f. defining an average stress concentration coefficient K = sigma within a high stress influence range S of the transition region2/σ1Where σ is1Is the average stress value of the overlying rock within the high stress influence range S of the transition region2The average stress of overlying strata of the filling section is obtained; analyzing the average stress concentration coefficient K value of the high stress influence range of the transition region under the conditions of different filling rates eta and filling-collapsing ratios V based on the numerical simulation result;
g. on the basis of a numerical simulation analysis result, a relational expression K (eta, V) of the filling rate eta, the filling-collapsing ratio V and the average stress concentration coefficient K in the high stress influence range S of the transition region is obtained by multivariate regression by adopting First Optimization statistical analysis software.
7. The method for controlling the local strong mine pressure of the transition region of the filling collaborative caving type fully mechanized mining face according to claim 1, characterized in that: in the step 6), the step (c) is carried out,
filling rate eta of fully mechanized face with collaborative collapse according to actual filling1And charge-collapse ratio V1Substituting relational expressions S (eta, V) and K (eta, V) to calculate the high stress influence area range S of the filling collaborative caving type fully mechanized mining face transition area1And the average stress concentration coefficient K of overburden rock1(ii) a Determining the number N of local reinforced supports and the strength P of the reinforced support in the transition area according to the following formulasFor treating：
In the formula: n-the smallest positive integer greater than or equal to N;
f is the center distance between adjacent hydraulic supports;
in the formula: pCharging deviceDesign support strength P of filling segment filling coal mining hydraulic supportCharging device。
8. The method for controlling the local strong mine pressure of the transition region of the filling collaborative caving type fully-mechanized mining face according to any one of claims 1 to 7, is characterized in that: the variation range of the filling rate eta is 40-55% during natural blanking and filling; the variation range during dense filling is 55-85%.
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| CN104358572A (en) * | 2014-09-11 | 2015-02-18 | 四川达竹煤电（集团）有限责任公司铁山南煤矿 | Non-pillar mining technology by spontaneous caving filling roadway at large inclined angle steeply inclined seam |
| CN105912810A (en) * | 2016-04-29 | 2016-08-31 | 中国矿业大学 | Design method of transition support timbering parameter of filling and fully-mechanized coal mining mixed mining surface |
| CN106168131A (en) * | 2015-06-24 | 2016-11-30 | 北京中矿创新联盟能源环境科学研究院 | Equipment system of roadway-free coal-pillar-free self-retained roadway mining method |
| CN108763725A (en) * | 2018-05-24 | 2018-11-06 | 西安科技大学 | Working face mining whole-course numerical modeling method based on goaf compacted fill ground |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104358572A (en) * | 2014-09-11 | 2015-02-18 | 四川达竹煤电（集团）有限责任公司铁山南煤矿 | Non-pillar mining technology by spontaneous caving filling roadway at large inclined angle steeply inclined seam |
| CN106168131A (en) * | 2015-06-24 | 2016-11-30 | 北京中矿创新联盟能源环境科学研究院 | Equipment system of roadway-free coal-pillar-free self-retained roadway mining method |
| CN105912810A (en) * | 2016-04-29 | 2016-08-31 | 中国矿业大学 | Design method of transition support timbering parameter of filling and fully-mechanized coal mining mixed mining surface |
| CN108763725A (en) * | 2018-05-24 | 2018-11-06 | 西安科技大学 | Working face mining whole-course numerical modeling method based on goaf compacted fill ground |
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