CN108108519B - Filling stope mine pressure weakening characterization method - Google Patents
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Abstract
The invention relates to a filling stope mine pressure weakening characterization method, aiming at the scientific problems of qualitative characterization and quantitative expression of filling stope mining influence and mine pressure weakening, a mobile cutting concept is introduced for qualitative characterization, critical conditions for forming a mobile cutting effect are given based on four index analyses of overburden displacement, advanced support stress concentration coefficient, support stress peak value and support stress influence range of a cut hole and different stope positions, then the quantitative expression of filling stope mine pressure weakening is realized by adopting a mobile cutting state, finally, stope mine pressure design is guided based on the mobile cutting effect, and the realization of accurate control of filling stope rock stratum position is finally promoted based on the engineering application basis of the given mobile cutting theory.
Description
Technical Field
The invention relates to a filling stope mine pressure weakening characterization method, and belongs to the technical field of coal solid filling mining.
Background
The solid filling mining method has obvious technical advantages in the aspects of rock stratum movement control, surface subsidence control, coal caving relief, solid waste treatment, roof disaster prevention and control and the like, is used as a mature technology for the prior art of integration of mining, selecting and filling, mining, selecting, pumping, filling, prevention and integration of formed coal and gas co-mining and the like, and the application boundary of the technology is expanded and extended to the front-edge scientific problems in the coal resource mining fields of deep resource mining, mine waste-free mining, coal and associated resource safety mining and the like.
However, for the mechanism of weakening stope mining influence by the filling body, especially for qualitative representation of the weakening state, quantitative expression of the weakening degree, reasonable definition of the weakening effect criticality and the like, and how to scientifically utilize the mechanism of weakening stope mining influence by the filling body to control the stope pressure of the filling stope, a complete set of design method does not exist at present.
Disclosure of Invention
The invention aims to provide a filling stope mine pressure weakening characterization method, which can realize qualitative characterization aiming at filling stope mine pressure weakening, realize reasonable definition of weakening effect critical conditions and improve the application efficiency of filling stope mine pressure weakening.
The invention adopts the following technical scheme for solving the technical problems: the invention designs a filling stope mine pressure weakening characterization method, which comprises the following steps:
step A, determining the filling rate of the target filling stope according to the geological conditions and the control indexes of the target filling stope, and then entering step B;
b, constructing a finite element analysis model of mining influence of the target filling stope by adopting a finite element analysis method according to the geological condition information of the filling coal face engineering of the target filling stope and the physical and mechanical parameters of the coal rock mass, and then entering the step C;
step C, constructing a filling scheme aiming at the filling rate, the working face size, the mining space and the mining height of the target filling stope, and entering the step D;
d, adopting a target filling stope mining influence finite element analysis model, carrying out simulation inversion on the target filling stope mining process aiming at the filling scheme, and then entering the step E;
e, according to the simulation inversion of the stoping process of the target filling stope, extracting a overburden rock displacement index, an advance support stress concentration coefficient index, a support stress peak index and a support stress influence range index of the target filling stope, and entering the step F;
and F, analyzing and obtaining the weakening mining influence effect degree of the filling body of the target filling stope according to the four indexes obtained in the step E.
As a preferred technical scheme of the invention: step G is also included, after the step F is executed, step G is entered;
g, judging whether the obtained filling body weakening mining influence effect degree of the target filling stope reaches a preset filling body weakening mining influence critical effect degree, if so, indicating that the filling scheme meets the preset filling requirement, and ending the method; otherwise, the filling scheme does not meet the preset filling requirement, and the step H is carried out;
and H, adjusting the data of the filling rate, the size of the working face, the mining space and the mining height of the target filling stope, updating the filling scheme, and returning to the step D.
As a preferred technical scheme of the invention: in the step G, the degree of the critical effect of the weakened mining influence of the preset filling body is defined as a moving eye-cutting state, and specifically includes: the maximum overburden displacement point and the supporting stress peak point gradually move forwards along with the forward movement of the working face, and the sinking degree is kept unchanged while the extraction distance of the working face is increased; and while the working face moves forward, the stress concentration coefficient of the filling stope is kept unchanged, and the stress concentration coefficient of the filling stope is kept within a preset numerical range.
As a preferred technical scheme of the invention: in the degree of the critical effect of the weakened mining influence of the preset filling body, the stress concentration coefficient of the filling stope is kept unchanged while the working face moves forwards, and the stress concentration coefficient of the filling stope is kept between 1.1 and 1.3.
Compared with the prior art, the application system of the filling stope mine pressure weakening characterization method has the following technical effects: the invention relates to a filling stope mine pressure weakening characterization method, which adopts a brand new design method, and introduces a moving cut-eye concept to perform qualitative characterization aiming at scientific problems of qualitative characterization and quantitative expression of filling stope mining influence and mine pressure weakening; based on four index analysis of overburden displacement, advanced support stress concentration coefficient, support stress peak value and support stress influence range of the open cut and different stoping positions, a critical condition for forming a moving cut effect is given, then quantitative expression of filling stope mine pressure weakening is achieved by adopting a moving cut state, finally stope mine pressure design is guided based on the moving cut effect, and implementation of accurate control of filling mining rock stratum attitude is promoted finally based on an engineering application basis of the given moving cut theory.
Drawings
FIG. 1 is a schematic flow diagram of a filling stope mine pressure weakening characterization method of the present invention;
FIG. 2 illustrates solid-pack coal mining geological conditions according to an embodiment of the present invention;
FIG. 3 illustrates a solid-fill coal mining numerical calculation model of the present invention;
FIG. 4 is a distribution of the bearing stress of the stope surrounding rock under caving method mining conditions;
FIG. 5 is a distribution of the bearing stresses of the stope surrounding rock under the cut-and-fill mining conditions of the present invention;
FIG. 6 shows the bearing stress state at different positions along the central axis of the working face by the collapse method;
FIG. 7 shows the bearing stress state at different positions along the central axis of the working surface according to the filling method of the present invention;
FIG. 8 is a direct top-down sinking comparison of the filling method and the caving method of the present invention;
FIG. 9 is a direct roof sink contrast without packing level;
FIG. 10 is a stress distribution diagram of the moving keyhole state of the present invention.
Detailed Description
The following description will explain embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention designs a filling stope mine pressure weakening characterization method, and in practical application, for a preset filling body weakening mining influence critical effect degree, a moving cut-hole state is defined, as shown in fig. 10, specifically: the maximum overburden displacement point and the supporting stress peak point gradually move forwards along with the forward movement of the working face, and the sinking degree is kept unchanged while the extraction distance of the working face is increased; and when the working face moves forward, the stress concentration coefficient of the filling stope is kept unchanged, and the stress concentration coefficient of the filling stope is kept between 1.1 and 1.3, according to the mine pressure weakening characterization method, in the stope mining process of the solid dense filling coal working face, the dense filling body obviously slows down the development of mine pressure, so that the weakening mining influence is caused, and is basically consistent with the mining influence effect on the stope when open cutting holes are formed, namely the mining influence on the filling working face is weakened into the state of the moving cutting hole effect, the filling stope without obvious periodic incoming pressure and obvious development of mine pressure is defined as the critical state of the moving cutting hole state, and if the mining influence on the filling stope reaches the critical state, the moving cutting hole state is used for characterizing the weakening phenomenon of the mine pressure of the filling stope. In the practical application process, the method specifically comprises the following steps:
and step A, determining the filling rate of the target filling stope according to the geological conditions and the control indexes of the target filling stope, and then entering the step B.
And step B, constructing a finite element analysis model of the mining influence of the target filling stope by adopting a finite element analysis method according to the geological condition information of the filling coal face engineering of the target filling stope and the physical and mechanical parameters of the coal rock mass, as shown in figure 3, and then entering the step C.
And C, constructing a filling scheme aiming at the filling rate, the working face size, the mining space and the mining height of the target filling stope, and entering the step D.
And D, adopting a target filling stope mining influence finite element analysis model, carrying out simulation inversion on the target filling stope mining process aiming at the filling scheme, and then entering the step E.
And E, according to the simulation inversion of the stoping process of the target filling stope, extracting the overburden displacement index, the advanced support stress concentration coefficient index, the support stress peak index and the support stress influence range index of the target filling stope, and entering the step F.
And F, analyzing and obtaining the weakened mining influence effect degree of the filling body of the target filling stope according to the four indexes obtained in the step E, and then entering the step G.
G, judging whether the obtained filling body of the target filling stope weakens the mining influence effect degree and reaches a moving cutting state, if so, indicating that the filling scheme meets the preset filling requirement, and ending the method; otherwise, the filling scheme does not meet the preset filling requirement, and the step H is carried out.
And H, adjusting the data of the filling rate, the size of the working face, the mining space and the mining height of the target filling stope, updating the filling scheme, and returning to the step D.
The mining pressure weakening characterization method for the filling stope is designed by the technical scheme, a brand new design method is adopted, and a mobile hole cutting concept is introduced for qualitative characterization aiming at qualitative characterization scientific problems of filling stope mining influence and mining pressure weakening; based on four index analysis of overburden displacement, advanced support stress concentration coefficient, support stress peak value and support stress influence range of the open cut and different stoping positions, a critical condition for forming a moving cut effect is given, then quantitative expression of filling stope mine pressure weakening is achieved by adopting a moving cut state, finally stope mine pressure design is guided based on the moving cut effect, and implementation of accurate control of filling mining rock stratum attitude is promoted finally based on an engineering application basis of the given moving cut theory.
The filling stope mine pressure weakening characterization method designed by the invention is applied to a coal seam histogram of a 7203W working surface as shown in FIG. 2 by taking a certain mine 7203W working surface as a specific embodiment, and specifically comprises the following steps:
and step A, determining the filling rate of the target filling stope according to the geological conditions and the control indexes of the target filling stope, and then entering the step B.
And B, constructing a finite element analysis model of mining influence of the target filling stope by adopting a finite element analysis method according to the geological condition information of the filling coal face engineering of the target filling stope and the physical and mechanical parameters of the coal rock mass, and then entering the step C.
Based on the steps A to B, a finite element numerical calculation model of solid filling coal mining is established by ABAQUS numerical simulation software according to a rock stratum histogram of a 7203W working face and rock mechanical parameters tested in a laboratory, as shown in figure 3, the length, width and height of the model are 300m × 190m × 189.7m, boundary constraints are added, 50m protective coal pillars are reserved on the periphery of the model, the length of an actual simulation working face is 90m, the propelling length is 200m, the excavation and filling step distance is 8.0m, and 25 steps of excavation and filling are counted.
And C, constructing a filling scheme aiming at the filling rate, the working face size, the mining space and the mining height of the target filling stope, and entering the step D.
And D, adopting a target filling stope mining influence finite element analysis model, carrying out simulation inversion on the target filling stope mining process aiming at the filling scheme, and then entering the step E.
Based on the steps C to D, in order to quantitatively research the change rule of stope stress and overburden rock displacement along with the stope under the conditions of a filling method and a caving method, the specific set parameters are that the elastic foundation coefficient of a filling body is 0.0 × 106 N.m-3、4.0×106N·m-3、10.0×106N·m-3、16.0×106N·m-3Respectively equivalent to caving method mining and filling mining with different filling rates, wherein the support frame type is a six-column filling coal mining hydraulic support; the monitoring indexes comprise overburden subsidence, filling body and coal rock body stress, and 4 analysis schemes are designed in total, and the specific table is shown in table 1.
TABLE 1
And E, as shown in the figures 5 and 6, according to the simulation inversion of the recovery process of the target filling stope, extracting the overburden displacement index, the advanced support stress concentration coefficient index, the support stress peak index and the support stress influence range index of the target filling stope, and entering the step F.
And F, analyzing and obtaining the weakened mining influence effect degree of the filling body of the target filling stope according to the four indexes obtained in the step E, and then entering the step G.
As shown in fig. 4, a significant supporting stress area is formed around the caving face stope in the early mining stage of the face, and the peak value of the stress is increased from 32Mpa to 46Mpa in the early mining stage of the face and in the process of advancing to 96m, so that the change is significant; a detailed supporting stress area is not formed around a stope of a filling method working face in the early mining stage and the subsequent mining process of the working face, and does not change remarkably along with the advancing of the working face, and the stress peak value is increased from 17.0Mpa to 18.0Mpa only in the early mining stage and the advancing process of the working face to 96m, and the change is not obvious. The filling weakens the effect degree of the mining influence.
G, judging whether the obtained filling body of the target filling stope weakens the mining influence effect degree and reaches a moving cutting state, if so, indicating that the filling scheme meets the preset filling requirement, and ending the method; otherwise, the filling scheme does not meet the preset filling requirement, and the step H is carried out.
Wherein, it is determined whether the filling body weakening mining influence effect degree of the obtained target filling stope reaches the moving cutting state, as shown in fig. 6, 7, 8 and 9:
a. for caving mining, the stress concentration coefficient in the coal wall gradually becomes larger along with the advance of the working face, and when the working face advances to 32, 48, 96, 152 and 200m, the stress concentration coefficients of coal bodies are respectively as follows: 2.08, 2.44, 2.81, 2.97 and 2.60, and the concentration coefficient is between 2.0 and 3.0. The displacements of the immediate roof are respectively: 500.00mm, 956.37mm, 1526.07mm, 1920.39mm, 2128.53 mm. The method shows that the concentration degree of stope stress is obvious, the change of the stress field is severe, the direct roof sinks greatly and the damage degree to the original rock is obvious under the condition of treating the goaf by the caving method.
b. For pack-cut mining, the stress concentration coefficient in the coal wall is basically unchanged along with the advancing of the working face, and when the working face is advanced to 32m, 48 m, 96m, 152 m and 200m, the stress concentration coefficients of the coal body are respectively as follows: 1.07, 1.09, 1.11, 1.09, basically unchanged, centered around 1.1. The method is characterized in that under the condition that the goaf is densely filled by the filling body, the stress concentration degree in the stoping process of the solid filling coal face is weak, the change of a stress field is small, and the damage degree to the original rock stress field is small. The displacements of the immediate roof are respectively: 213.38mm, 234.36mm, 265.63mm, 281.54mm and 288.78 mm. Moreover, under the condition of different fullness rates, the sinking peak values of the direct roof are different, but the whole fluctuation is kept in a small range.
And H, adjusting the data of the filling rate, the size of the working face, the mining space and the mining height of the target filling stope, updating the filling scheme, and returning to the step D.
In practical application, the filling rate corresponding to the moving cutting state under the geological condition of the embodiment at least reaches 82%.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (4)
1. A filling stope mine pressure weakening characterization method is characterized by comprising the following steps:
step A, determining the filling rate of the target filling stope according to the geological conditions and the control indexes of the target filling stope, and then entering step B;
b, constructing a finite element analysis model of mining influence of the target filling stope by adopting a finite element analysis method according to the geological condition information of the filling coal face engineering of the target filling stope and the physical and mechanical parameters of the coal rock mass, and then entering the step C;
step C, constructing a filling scheme aiming at the filling rate, the working face size, the mining space and the mining height of the target filling stope, and entering the step D;
d, adopting a target filling stope mining influence finite element analysis model, carrying out simulation inversion on the target filling stope mining process aiming at the filling scheme, and then entering the step E;
e, according to the simulation inversion of the stoping process of the target filling stope, extracting a overburden rock displacement index, an advance support stress concentration coefficient index, a support stress peak index and a support stress influence range index of the target filling stope, and entering the step F;
and F, analyzing and obtaining the weakening mining influence effect degree of the filling body of the target filling stope according to the four indexes obtained in the step E.
2. The filling stope mine pressure weakening characterization method according to claim 1, further comprising the following steps, after the step F is executed, entering the step G;
g, judging whether the obtained filling body weakening mining influence effect degree of the target filling stope reaches a preset filling body weakening mining influence critical effect degree, if so, indicating that the filling scheme meets the preset filling requirement, and ending the method; otherwise, the filling scheme does not meet the preset filling requirement, and the step H is carried out;
and H, adjusting the data of the filling rate, the size of the working face, the mining space and the mining height of the target filling stope, updating the filling scheme, and returning to the step D.
3. The filling stope mine pressure weakening characterization method according to claim 2, characterized in that: in the step G, the degree of the critical effect of the weakened mining influence of the preset filling body is defined as a moving eye-cutting state, and specifically includes: the maximum overburden displacement point and the supporting stress peak point gradually move forwards along with the forward movement of the working face, and the sinking degree is kept unchanged while the extraction distance of the working face is increased; and while the working face moves forward, the stress concentration coefficient of the filling stope is kept unchanged, and the stress concentration coefficient of the filling stope is kept within a preset numerical range.
4. The filling stope mine pressure weakening characterization method according to claim 3, characterized in that: in the degree of the critical effect of the weakened mining influence of the preset filling body, the stress concentration coefficient of the filling stope is kept unchanged while the working face moves forwards, and the stress concentration coefficient of the filling stope is kept between 1.1 and 1.3.
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| CN104653224A (en) * | 2014-12-12 | 2015-05-27 | 河北联合大学 | Open pit tailing cemented filling treatment method |
| CN106485015A (en) * | 2016-10-20 | 2017-03-08 | 辽宁工程技术大学 | A kind of determination method of mine tomography coverage |
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| CN103758519A (en) * | 2013-12-27 | 2014-04-30 | 金川集团股份有限公司 | Thick and large mineral deposit stage subsequent filling method mining piecewise optimization design and implementation method |
| CN107122925B (en) * | 2017-06-19 | 2020-08-04 | 金川集团股份有限公司 | Mining engineering decision method by filling method |
| CN108108519B (en) * | 2017-11-28 | 2020-07-10 | 中国矿业大学 | Filling stope mine pressure weakening characterization method |
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| CN104653224A (en) * | 2014-12-12 | 2015-05-27 | 河北联合大学 | Open pit tailing cemented filling treatment method |
| CN106485015A (en) * | 2016-10-20 | 2017-03-08 | 辽宁工程技术大学 | A kind of determination method of mine tomography coverage |
| CN107067333A (en) * | 2017-01-16 | 2017-08-18 | 长沙矿山研究院有限责任公司 | A kind of high altitudes and cold stability of the high and steep slope monitoring method |
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