CN108399497B - Strip mining goaf stability evaluation method - Google Patents
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Abstract
The invention belongs to the technical field of mining engineering, and relates to a stability evaluation method for a strip mining goaf. The method analyzes the earth surface movement duration caused by coal mining on the basis of comprehensively sorting and analyzing the relevant data of the research area, better evaluates the stability of the goaf from theoretical combination and actual combination, can accurately obtain the influence condition of the stability of the goaf on later-stage ground land reutilization through a scientific and comprehensive analysis method, provides scientific basis for the reutilization of sinking earth energy or the safety of land with certain property, and is suitable for wide popularization and application.
Description
Technical Field
The invention belongs to the technical field of mining engineering, and relates to a stability evaluation method for a strip mining goaf.
Background
Strip mining is a partial mining method that divides the area of a coal seam to be mined into a more regular strip shape, and takes and leaves one strip, so that the remaining strip coal column is sufficient to support the weight of the overburden, while causing less movement and deformation of the surface. The basic method of the strip mining technology is to utilize reserved strip coal pillars to support overlying strata, so that the purposes of recycling a part of coal resources, controlling surface deformation and protecting ground buildings are achieved. Since the 'three-down' coal briquetting is mined by a filling stripe method from 1967 in China, stripe mining is successively carried out on stripe working faces of more than 10 provinces and more than 100 provinces in China, and abundant research results and actual observation data are obtained. The top plate is managed by adopting a caving method in strip mining in China, the mining depth is generally less than 400m, the mining thickness is below 6m, and the mining rate is generally between 40 and 78.6 percent. In the aspect of theoretical research, Chinese scholars carry out a great deal of research on stripe mining, and the research mainly comprises the aspects of stripe mining ground surface movement mechanism and law, stripe mining ground surface movement and deformation prediction methods and prediction parameters, stripe coal pillar stability research and the like. However, the research on the stability evaluation of the strip mining goaf is less, at present, domestic scholars mainly concentrate on a caving method full goaf stability evaluation system, and the stability evaluation method of the strip mining goaf has no mature experience at present, so that the stability evaluation method of the strip mining goaf is provided according to the successful experience of a plurality of projects.
Disclosure of Invention
The invention provides a scientific stability evaluation method for a strip mining goaf, aiming at the problem that the stability evaluation of the strip mining goaf is less in research.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a stability evaluation method for a strip mining goaf comprises the following analysis steps:
(1) on the basis of comprehensively sorting and analyzing relevant data of the research area, the current moving deformation situation of the current ground surface near the research area is estimated and analyzed by adopting a probability integration method to obtain a ground surface subsidence value w, a horizontal deformation epsilon, an inclined deformation i and a curvature deformation k; drawing the numerical values into a surface deformation contour map, and determining whether the research area is in a sinking area;
(2) analyzing the duration of the surface movement caused by coal mining: the earth's surface movement duration (earth's surface movement period) refers to the whole time from the beginning to the end of the earth's surface movement, and the process can be roughly divided into three stages: the method comprises an initial period, an active period and a decline period, wherein after the decline period of the surface movement is finished, the surface subsidence can be considered to be relatively stable, and the calculation formula is as follows:
analyzing whether residual movement deformation exists in the strip goaf or not by determining the earth surface movement duration, and providing a time parameter basis for the next step of residual movement deformation calculation;
(3) determining residual movement subsidence parameters according to the residual movement time, and predicting and analyzing the current earth surface residual movement deformation value near the research area by utilizing a probability integration method to obtain an earth surface subsidence value w, a horizontal deformation epsilon, an inclined deformation i and a curvature deformation k;
(4) because the residual coal pillars of the special mining methods such as strip mining and the like are more, and the residual deformation is larger than the total mining of the caving method, the evaluation method is based on the empirical formula of the residual sinking coefficient of the longwall mining of the coal mine, and comprises the following steps:
after formula adjustment is carried out by combining with part of mining recovery rates, a new formula is deduced to select parameters such as residual subsidence coefficients of the strip goaf, a probability integration method is adopted to predict and analyze the current surface residual movement deformation value near the research area, and a surface subsidence value w, a horizontal deformation epsilon, an inclined deformation i and a curvature deformation k are obtained;
(5) superposing the residual movement deformation and the residual movement deformation, drawing a surface deformation contour map, and determining the influence position and the influence degree of the research area;
(6) because the residual coal pillars of the special mining methods such as strip mining and the like are more, the coal pillars are possibly unstable along with the time, so that the overlying strata balance is broken again to cause the earth surface to generate moving deformation again, the mining width and the remaining width of the strip mining need to be checked, and a formula is utilized
Calculating the coal pillar pressure-bearing safety coefficient (the ratio of the limit load which the coal pillar can bear to the load which the coal pillar actually bears), and analyzing the long-term stability of the coal pillar;
(7) according to the coal pillar pressure-bearing safety coefficient calculation result, performing instability calculation on the coal pillar with unstable and basically stable coal pillar stability to obtain an earth surface subsidence value w, a horizontal deformation epsilon, an inclined deformation i and a curvature deformation k; drawing a related contour map, and defining the instability influence range;
(8) establishing a strip mining goaf stability comprehensive analysis model: selecting three evaluation factors (U1, U2 and U3) obtained in the steps (5), (6) and (7), and prescribing site stability grade (x 1), proposed project importance (x 2), proposed project deformation requirement (x 3), proposed mining impact resistant technical measure (x 4), goaf characteristic impact degree on proposed project (x 5), goaf activation impact factor impact degree on proposed project (x 6), goaf residual deformation impact degree on proposed project (x 7) and proposed project impact degree on goaf (x 8) according to corresponding specifications, wherein the eight evaluation indexes are as follows by a fuzzy mathematical calculation method:
U1={ x1，x2，x3，x4，x5，x6，x7，x8}
U2={ x1，x2，x3，x4，x5，x6，x7，x8}
U3={ x1，x2，x3，x4，x5，x6，x7，x8}
the evaluation matrixes Q = { U1, U2 and U3} T are formed by U1, U2 and U3, stability is comprehensively analyzed according to assigned weights, evaluation results are obtained, and the evaluation results serve as bases for later-stage subsidence reutilization.
Compared with the prior art, the invention has the advantages and positive effects that: on the basis of comprehensively sorting and analyzing relevant data of the research area, the invention analyzes the earth surface movement duration caused by coal mining, and combines a mining mode and a strip mining goaf stability evaluation method, so that the stability degree of the goaf is better evaluated from theory and practice, the influence of the goaf stability on the later ground land reutilization can be accurately obtained through a scientific analysis method, a scientific basis is provided for the safety of whether subsided geothermal energy is reused or what kind of land is used, and the method is suitable for wide popularization and application.
Detailed Description
In order that the above objects, features and advantages of the present invention may be more clearly understood, the present invention will be further described with reference to specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.
The embodiment provides a specific strip mining goaf stability evaluation method, which comprises the following analysis steps:
(1) on the basis of comprehensively sorting and analyzing relevant data of the research area, the current moving deformation situation of the current ground surface near the research area is estimated and analyzed by adopting a probability integration method to obtain a ground surface subsidence value w, a horizontal deformation epsilon, an inclined deformation i and a curvature deformation k; drawing the numerical values into a surface deformation contour map, and determining whether the research area is in a sinking area;
(2) analyzing the duration of the surface movement caused by coal mining: the earth's surface movement duration (earth's surface movement period) refers to the whole time from the beginning to the end of the earth's surface movement, and the process can be roughly divided into three stages: the method comprises an initial period, an active period and a decline period, wherein after the decline period of the surface movement is finished, the surface subsidence can be considered to be relatively stable, and the calculation formula is as follows:
analyzing whether residual movement deformation exists in the strip goaf or not by determining the earth surface movement duration, and providing a time parameter basis for the next step of residual movement deformation calculation;
(3) obtaining the residual movement time according to the reference and determining the residual movement subsidence parameters, and then predicting and analyzing the current earth surface residual movement deformation value near the research area by utilizing a probability integration method to obtain an earth surface subsidence value w, a horizontal deformation epsilon, an inclined deformation i and a curvature deformation k;
(4) because the residual coal pillars of the special mining methods such as strip mining and the like are more, and the residual deformation is larger than the total mining of the caving method, the evaluation method is based on the empirical formula of the residual sinking coefficient of the longwall mining of the coal mine, and comprises the following steps:
after formula adjustment is carried out by combining with part of mining recovery rates, a new formula is deduced to select parameters such as residual subsidence coefficients of the strip goaf, a probability integration method is adopted to predict and analyze the current surface residual movement deformation value near the research area, and a surface subsidence value w, a horizontal deformation epsilon, an inclined deformation i and a curvature deformation k are obtained;
(5) superposing the residual movement deformation and the residual movement deformation, drawing a surface deformation contour map, and determining the influence position and the influence degree of the research area;
(6) because the residual coal pillars of the special mining methods such as strip mining and the like are more, the coal pillars are possibly unstable along with the time, so that the overlying strata balance is broken again to cause the earth surface to generate moving deformation again, the mining width and the remaining width of the strip mining need to be checked, and a formula is utilized
Calculating the coal pillar pressure-bearing safety coefficient (the ratio of the limit load which the coal pillar can bear to the load which the coal pillar actually bears), and analyzing the long-term stability of the coal pillar;
(7) according to the coal pillar pressure-bearing safety coefficient calculation result, performing instability calculation on the coal pillar with unstable and basically stable coal pillar stability to obtain an earth surface subsidence value w, a horizontal deformation epsilon, an inclined deformation i and a curvature deformation k; drawing a related contour map, and defining the instability influence range;
(8) establishing a strip mining goaf stability comprehensive analysis model: selecting three evaluation factors (U1, U2 and U3) obtained in the steps (5), (6) and (7), and prescribing site stability grade (x 1), proposed project importance (x 2), proposed project deformation requirement (x 3), proposed mining impact resistant technical measure (x 4), goaf characteristic impact degree on proposed project (x 5), goaf activation impact factor impact degree on proposed project (x 6), goaf residual deformation impact degree on proposed project (x 7) and proposed project impact degree on goaf (x 8) according to corresponding specifications, wherein the eight evaluation indexes are as follows by a fuzzy mathematical calculation method:
U1={ x1，x2，x3，x4，x5，x6，x7，x8}
U2={ x1，x2，x3，x4，x5，x6，x7，x8}
U3={ x1，x2，x3，x4，x5，x6，x7，x8}
the evaluation matrixes Q = { U1, U2 and U3} T are formed by U1, U2 and U3, stability is comprehensively analyzed according to assigned weights, evaluation results are obtained, and the evaluation results serve as bases for later-stage subsidence reutilization.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (1)
1. A strip mining goaf stability evaluation method is characterized by comprising the following analysis steps:
(1) the current moving deformation situation of the earth surface near a research area is estimated and analyzed by adopting a probability integration method to obtain an earth surface subsidence value w, a horizontal deformation epsilon, an inclined deformation i and a curvature deformation k; drawing the numerical values into a surface deformation contour map, and determining whether the research area is in a sinking area;
(2) analyzing the earth surface movement duration caused by coal mining, wherein the calculation formula is as follows:
analyzing whether residual movement deformation exists in the strip goaf or not by determining the earth surface movement duration, and providing a time parameter basis for residual movement deformation calculation so as to obtain the residual movement time;
(3) determining residual movement subsidence parameters according to the residual movement time, and predicting and analyzing the current earth surface residual movement deformation value near the research area by utilizing a probability integration method to obtain an optimized earth surface subsidence value w, a horizontal deformation epsilon, an inclined deformation i and a curvature deformation k;
(4) according to an empirical formula of the coal mine longwall mining residual subsidence coefficient, the method comprises the following steps:
adjusting a formula by combining with partial mining recovery rate, deducing a new formula to select residual subsidence coefficient parameters of the strip goaf, and predicting and analyzing the current surface residual movement deformation value near the research area by adopting a probability integration method to obtain an optimized surface subsidence value w, a horizontal deformation epsilon, an inclined deformation i and a curvature deformation k;
(5) superposing the residual movement deformation value and the residual movement deformation value, drawing a surface deformation contour map, and determining the influence position and the influence degree of the research area;
(6) checking the mining width and the reserved width of the strip mining, and utilizing a formula
Calculating the pressure-bearing safety coefficient of the coal pillar, and analyzing the long-term stability of the coal pillar;
(7) according to the coal pillar pressure-bearing safety coefficient calculation result, performing instability calculation on the coal pillar with unstable and basically stable coal pillar stability to further obtain an earth surface subsidence value w, a horizontal deformation epsilon, an inclined deformation i and a curvature deformation k; drawing a related contour map, and defining the instability influence range;
(8) establishing a strip mining goaf stability comprehensive analysis model:
selecting the coefficients or parameters obtained in the steps (5), (6) and (7), and prescribing eight evaluation indexes, namely site stability grade x1, proposed project importance x2, proposed project deformation requirement x3, proposed mining impact resistance technical measure x4, goaf characteristic influence degree x5 on the proposed project, goaf activation influence factor influence degree x6 on the proposed project, goaf residual deformation influence degree x7 on the proposed project and influence degree x8 on the goaf according to corresponding specifications, wherein the evaluation indexes comprise the following steps:
U1={ x1，x2，x3，x4，x5，x6，x7，x8}，
U2={ x1，x2，x3，x4，x5，x6，x7，x8}，
U3={ x1，x2，x3，x4，x5，x6，x7，x8}，
the evaluation matrixes Q = { U1, U2 and U3} T are formed by U1, U2 and U3, stability is comprehensively analyzed according to assigned weights, evaluation results are obtained, and the evaluation results serve as bases for later-stage subsidence reutilization.
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| CN112525777B (en) * | 2020-11-18 | 2022-03-18 | 东南大学 | Method for judging influence range of mined-out sand goaf based on particle size analysis principle in sedimentology |
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