CN113987844B - House pillar type goaf stability dynamic evaluation method and system - Google Patents
House pillar type goaf stability dynamic evaluation method and system Download PDFInfo
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Abstract
The application relates to the technical field of mining, and provides a room and column type goaf stability dynamic evaluation method and system, which comprise: constructing a first mapping relation between a plurality of groups of calculation data and a plurality of groups of model parameters of the room-and-pillar type goaf; based on a numerical model, obtaining simulation data of the coal pillars of the room-and-pillar type goaf according to the mechanical parameters of the coal rock bodies of the room-and-pillar type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process; and adjusting model parameters of the numerical model according to monitoring data, simulation data and a first mapping relation at a preset monitoring point of the room and pillar type goaf in the lower-layer fully-mechanized coal mining dynamic stoping process so as to dynamically evaluate the stability of the room and pillar type goaf coal pillars. Therefore, the influence of the disturbance of the fully-mechanized mining of the lower coal on the room-and-column coal pillars is considered, and a scientific basis is provided for accurately evaluating the dynamic stability of the room-and-column goaf coal pillars, preventing and treating the suspended ceiling disaster of the large-area room-and-column goaf, constructing and supporting schemes for surrounding rocks of the roadway, and avoiding accidents such as pressing frame and roof dynamic disasters.
Description
Technical Field
The application relates to the technical field of mining, in particular to a room-and-column goaf stability dynamic evaluation method and system.
Background
The dynamic evaluation method for the stability of the multi-coal-seam shallow-buried large-area room-and-pillar type goaf is developed, scientific guidance can be provided for the prevention and control of large-area roof hanging disasters of the goaf, and the method has important significance for safe production of mines and environmental protection.
At present, scholars study on goaf stability evaluation; for example, a dimensionless expression is established through dimensional analysis to obtain dimensionless parameters influencing the critical top plate thickness, and on the basis, a numerical model is established by means of a CDEM numerical calculation method and is subjected to calculation analysis; considering the fuzziness of the subjective weight and the objective weight, and evaluating and analyzing the stability of the top plate of the goaf by adopting a fuzzy mathematical method; for another example, on the basis of obtaining the numerical model through laser scanning, the stress, displacement and size and condition of the surrounding rock of the goaf are analyzed. However, when the stability of the goaf is evaluated, the existing method mainly performs mathematical analysis or numerical calculation aiming at a certain static stage of the goaf, the influence of the difference of engineering geological conditions and the 'secondary activation disturbance' of multi-coal-seam mining is not considered, and the evaluation result has hysteresis for guiding the lower fully mechanized mining dynamic excavation.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The application aims to provide a room and column type goaf stability dynamic evaluation method and system to solve or alleviate the problems in the prior art.
In order to achieve the above purpose, the present application provides the following technical solutions:
the application provides a room-and-column goaf stability dynamic evaluation method, which comprises the following steps: s101, constructing a first mapping relation between a plurality of groups of calculation data and a plurality of groups of model parameters of the room and pillar type goaf; the model parameters are rock mechanical parameters to be adjusted of each coal rock mass of a numerical model of the room-and-column type goaf constructed in advance; step S102, based on the numerical model, obtaining simulation data of the coal pillar of the room-and-column type goaf according to the rock mechanical parameters of each coal rock body of the room-and-column type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process; wherein the simulation data comprises a stress simulation value and a displacement simulation value; s103, adjusting model parameters of the numerical model according to monitoring data at preset monitoring points of the room and pillar type goaf, the simulation data and the first mapping relation in the lower-layer coal fully-mechanized mining dynamic stoping process so as to dynamically evaluate the stability of the room and pillar type goaf; wherein the monitoring data comprises a stress monitoring value and a displacement monitoring value.
Preferably, in step S101, a first mapping relationship between multiple sets of calculation data and multiple sets of model parameters of the room and pillar type goaf is constructed, specifically: and constructing a first mapping relation between the calculation data corresponding to the multiple groups of rock mechanical parameter sample data and the multiple groups of model parameters based on the numerical model according to the multiple groups of rock mechanical parameter sample data of each coal rock mass of the room and pillar type goaf acquired in advance.
Preferably, in step S102, based on the numerical model, obtaining simulation data of the room and pillar type goaf according to rock mechanical parameters of each coal rock mass of the room and pillar type goaf in the lower-layer fully-mechanized coal mining dynamic stoping process specifically includes: and according to the rock sample of the room and column type goaf in the dynamic stoping process, obtaining rock mechanical parameters of the room and column type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process, and obtaining a stress simulation value and a displacement simulation value of the room and column type goaf based on the numerical model.
Preferably, in step S103, the adjusting the model parameters of the numerical model according to the monitoring data at the preset monitoring point of the room and pillar type goaf, the simulation data and the first mapping relationship in the lower-layer coal fully mechanized mining dynamic stoping process to perform dynamic stability evaluation on the room and pillar type goaf coal pillar includes: s113, determining whether model parameters of the numerical model need to be adjusted according to monitoring data and the simulation data at preset monitoring points of the room-and-column type goaf in the lower-layer fully-mechanized coal mining dynamic stoping process; step S123, responding to the requirement of adjusting model parameters of the numerical model, and determining model parameters to be adjusted in the numerical model according to the monitoring data based on the first mapping relation; and S133, evaluating the stability of the room-and-pillar type goaf coal pillars in the lower-layer coal fully-mechanized mining dynamic stoping process based on the numerical model after model parameter adjustment.
Preferably, in step S113, determining whether a model parameter of the numerical model needs to be adjusted according to the monitoring data and the simulation data at the preset monitoring point of the room-and-pillar type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process specifically includes: and comparing the monitoring data of the preset monitoring point of the room and pillar type goaf with the simulation data in the lower-layer coal fully-mechanized mining dynamic stoping process, and determining to adjust the model parameters of the numerical model if the monitoring data is inconsistent with the simulation data.
Preferably, in step S123, the determining, based on the first mapping relationship and according to the monitoring data, a model parameter to be adjusted in the numerical model in response to the model parameter of the numerical model needing to be adjusted specifically includes: and responding to the requirement of adjusting the model parameters of the numerical model, matching the monitoring data with the calculation data, and selecting the model parameters in the first mapping relation corresponding to the calculation data with consistent matching results as the model parameters to be adjusted.
Preferably, in step S133, based on the numerical model after the model parameter adjustment, the stability of the room and pillar type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process is evaluated, specifically: simulating the simulation data of the room and column type goaf in the dynamic stoping process based on the numerical model after model parameter adjustment, comparing the simulation data with the monitoring data of the preset monitoring points of the room and column type goaf in the dynamic stoping process until the monitoring data of the room and column type goaf is consistent with the simulation data in the dynamic stoping process, and dynamically evaluating the stability of the room and column type goaf coal pillar.
Preferably, the room and pillar type goaf stability dynamic evaluation method further includes: s301, constructing a second mapping relation between multiple groups of calculated data of the room and pillar type goaf and multiple groups of preset coal pillar safety factors; step S302, according to the monitoring data at the preset monitoring point of the room and pillar type goaf in the dynamic stoping process and the second mapping relation, carrying out safety assessment on the room and pillar type goaf in the dynamic stoping process.
Preferably, in step S302, according to the monitoring data at the preset monitoring point of the room and pillar type goaf in the dynamic stoping process and the second mapping relationship, performing security assessment on the room and pillar type goaf in the dynamic stoping process, specifically: and in the dynamic stoping process of the lower-layer coal fully-mechanized mining according to the preset mining distance, carrying out dynamic safety assessment on the room and pillar type goaf in the dynamic stoping process according to the monitoring data at the preset monitoring point of the room and pillar type goaf and the second mapping relation.
The embodiment of the present application further provides a room and column type goaf stability dynamic evaluation system, include: the first mapping unit is configured to construct a first mapping relation between a plurality of groups of calculation data and a plurality of groups of model parameters of the room and pillar type goaf; the model parameters are rock physical mechanical parameters of coal rock masses to be adjusted of a numerical model of the room-and-column type goaf constructed in advance; the simulation unit is configured to obtain simulation data of the coal pillar of the room and pillar type goaf according to rock mechanical parameters of each coal rock body of the room and pillar type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process based on the numerical model; the simulation data comprises a stress simulation value and a displacement simulation value adjusting and evaluating unit, and the stress simulation value and the displacement simulation value adjusting and evaluating unit is configured to adjust model parameters of the numerical model according to monitoring data at a preset monitoring point of the room and pillar type goaf in the lower-layer fully-mechanized coal mining dynamic stoping process, the simulation data and the first mapping relation so as to dynamically evaluate the stability of the room and pillar type goaf; wherein the monitoring data comprises a stress monitoring value and a displacement monitoring value.
Has the advantages that:
according to the technical scheme, firstly, a first mapping relation among a plurality of groups of stress and displacement calculation values and a plurality of groups of model parameters of a room-and-column type goaf is established; the model parameters are to-be-adjusted rock mechanical parameters of a pre-constructed numerical model of the room-and-column type goaf; then, based on a numerical model, performing simulation calculation on the room-and-column type goaf according to the rock mechanical parameters of each coal-rock body of the room-and-column type goaf in the dynamic stoping process to obtain stress and displacement simulation values of the room-and-column type goaf; and finally, comparing the stress and displacement monitoring values with the stress and displacement simulation values at the preset monitoring points of the room-and-column type goaf in the dynamic stoping process, and performing inversion to obtain rock mechanical parameters (rock mechanical parameters to be adjusted) of each coal rock mass. The method comprises the steps of inputting rock mechanical parameters (rock mechanical parameters to be adjusted) obtained through inversion into a pre-constructed numerical model, and respectively evaluating and predicting the stability of the room and pillar type coal pillars in the lower-layer coal fully-mechanized mining process, thereby fully considering the influence of disturbance of lower-layer coal fully-mechanized mining on the room and pillar type coal pillars, and providing scientific basis for accurately evaluating the dynamic stability of the room and pillar type goaf coal pillars, preventing and controlling large-area room and pillar type goaf overhanging disasters, optimizing roadway surrounding rock construction supporting schemes, and avoiding accidents such as pressing frames and roof dynamic disasters.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. Wherein:
fig. 1 is a schematic flow chart of a room and pillar type goaf stability dynamic evaluation method provided in accordance with some embodiments of the present application;
fig. 2 is a schematic flow chart of step S103 in a room and pillar type goaf stability dynamic evaluation method according to some embodiments of the present application;
FIG. 3 is a schematic flow chart of a room and pillar goaf stability dynamic evaluation method according to further embodiments of the present application;
fig. 4 is a schematic structural diagram of a room and pillar type goaf stability dynamic evaluation system according to some embodiments of the present application.
Detailed Description
The present application will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the application and are not limiting of the application. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present application cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Fig. 1 is a schematic flow chart of a room and pillar type goaf stability dynamic evaluation method provided in accordance with some embodiments of the present application; as shown in fig. 1, the method for dynamically evaluating the stability of the room and pillar type goaf comprises the following steps:
s101, constructing a first mapping relation between a plurality of groups of calculation data and a plurality of groups of model parameters of the room and pillar type goaf; and the model parameters are the mechanical parameters of rocks to be adjusted of all coal rocks of the data model of the room and pillar type goaf which is constructed in advance.
Specifically, when a first mapping relation between multiple sets of calculation data and multiple sets of model parameters of the room and pillar type goaf is established, a first mapping relation between the calculation data and the multiple sets of model parameters corresponding to the multiple sets of rock mechanics parameter sample data is established based on the numerical model according to the multiple sets of rock mechanics parameter sample data of each coal rock body of the room and pillar type goaf, wherein the multiple sets of rock mechanics parameter sample data are acquired in advance.
In the embodiment of the application, the calculation data comprises a stress calculation value and a displacement calculation value; the rock mechanical parameters of the coal rock mass are different, the model parameters in the constructed numerical model are different, and the rock mechanical parameters of each coal rock mass have corresponding model parameters. Grouping the obtained rock mechanical parameter sample data of each coal rock mass of the room and pillar type goaf, inputting the sample data into a pre-constructed numerical model corresponding to the rock mechanical parameters of the coal rock mass, and calculating to obtain a stress calculation value and a displacement calculation value of the coal pillar of the room and pillar type goaf, wherein the stress calculation value and the displacement calculation value are corresponding to the rock mechanical parameters of the coal rock mass. Therefore, the corresponding relation between the calculated stress value and the calculated displacement value of each coal rock mass and the rock mechanical parameters of the coal rock mass, namely the first mapping relation can be established.
In the embodiment of the application, a numerical model of the room and pillar type goaf is constructed through the engineering geological characteristics of the room and pillar type goaf, the ground stress field, the rock mechanical parameters of each coal and rock mass, the position of the room and pillar type goaf and the determined lower coal fully mechanized mining scheme. Specifically, the physical space system of the room-and-pillar type goaf of the multi-coal seam is converted into a model formed by combining a solid unit and a structural unit, namely a numerical model, through FLAC 3D. Firstly, extracting a contour map of a numerical model to be constructed according to data such as a planar graph of a mining project of a multi-coal-seam goaf, a profile graph of an exploration address and the like; then, generating a terrain entity model by using MIDAS/GTS, dividing grids, and importing related data files into FLAC 3D; and finally, generating a numerical model of the multi-coal-seam goaf containing the entity unit and the structural unit by importing the FLAC3D model file.
Step S102, based on the numerical model, obtaining simulation data of the coal pillar of the room-and-column type goaf according to the rock mechanical parameters of each coal rock body of the room-and-column type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process; wherein the simulation data comprises a stress simulation value and a displacement simulation value;
in the embodiment of the application, in the lower-layer coal fully-mechanized mining dynamic stoping process, the mechanical parameters of each coal-rock body in the room-and-column type goaf are obtained sample values, the sample values of the mechanical parameters of each coal-rock body in the room-and-column type goaf are input into a numerical model, and the room-and-column type goaf is simulated and deduced, so that the stress simulation value and the displacement simulation value of the coal column in the room-and-column type goaf can be obtained.
Specifically, when the simulation data of the room and pillar type goaf is obtained based on the data model and according to the rock mechanical parameters of each coal rock mass of the room and pillar type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process, the rock mechanical parameters of the room and pillar type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process are obtained according to the rock sample of the room and pillar type goaf in the dynamic stoping process, and the stress simulation value and the displacement simulation value of the room main type goaf are obtained based on the numerical model.
S103, adjusting model parameters of the numerical model according to monitoring data at preset monitoring points of the room and pillar type goaf, the simulation data and the first mapping relation in the lower-layer coal fully-mechanized mining dynamic stoping process so as to dynamically evaluate the stability of the room and pillar type goaf; wherein the monitoring data comprises a stress monitoring value and a displacement monitoring value.
In the embodiment of the application, the stress and displacement monitoring values and the stress and displacement simulation values at the preset monitoring points in the lower-layer coal fully-mechanized mining dynamic recovery process are compared, rock mechanical parameters (to-be-adjusted rock mechanical parameters) of each coal rock mass are obtained through inversion, then the rock mechanical parameters (to-be-adjusted rock mechanical parameters) of the coal rock mass obtained through inversion are input into a numerical model, and the numerical model after model parameter adjustment is utilized to evaluate and predict the stability of the room-and-pillar type coal pillar in the lower-layer coal fully-mechanized mining process.
Fig. 2 is a schematic flow chart of step S103 in a room and pillar type goaf stability dynamic evaluation method according to some embodiments of the present application; as shown in fig. 2, adjusting the model parameters of the numerical model according to the monitoring data, the simulation data and the first mapping relationship at the preset monitoring point of the room and pillar type goaf during the dynamic stoping process of the lower layer coal to dynamically evaluate the stability of the room and pillar type goaf coal pillar includes:
s113, determining whether model parameters of the numerical model need to be adjusted according to monitoring data and the simulation data at preset monitoring points of the room-and-column type goaf in the lower-layer fully-mechanized coal mining dynamic stoping process;
specifically, the monitoring data of the preset monitoring point of the room and pillar type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process are compared with the simulation data, and if the monitoring data are inconsistent with the simulation data, the model parameters of the numerical model are determined to be adjusted.
In the embodiment of the application, monitoring equipment is arranged at a preset monitoring point of a room-and-column type goaf, the stress and the displacement of a coal column in the lower-layer coal fully-mechanized mining dynamic stoping process are monitored in real time, a stress monitoring value and a displacement monitoring value at the preset monitoring point are obtained, and the monitored stress monitoring value and the monitored displacement monitoring value of the coal column are compared with a stress analog value and a displacement analog value obtained according to a sample value; if the stress monitoring value and the displacement monitoring value are consistent with the stress simulation value and the displacement simulation value, the rock mechanical parameters of the coal rock mass serving as model parameters at present are in accordance with reality, and the stability of the coal pillar of the room-and-column type goaf can be evaluated when the lower-layer coal fully-mechanized dynamic stoping is excavated in the next step through the corresponding numerical model; if the stress monitoring value and the displacement monitoring value are not consistent with the stress simulation value and the displacement simulation value, the rock mechanical parameters of the coal rock mass currently used as model parameters are not practical, when the lower-layer coal fully-mechanized dynamic stoping is excavated in the next step through the corresponding numerical model, errors can be generated by evaluating the stability of the coal pillar of the room-and-column type goaf, so that the prediction is inaccurate, at the moment, the model parameters of the numerical model need to be adjusted, and new and proper rock mechanical parameters of the coal rock mass are selected as the model parameters of the numerical model.
Step S123, responding to the requirement of adjusting model parameters of the numerical model, and determining model parameters to be adjusted in the numerical model according to the monitoring data based on the first mapping relation;
specifically, in response to the need for adjusting the model parameters of the numerical model, the monitoring data is matched with the calculation data, and the model parameters in the first mapping relationship corresponding to the calculation data with the consistent matching result are selected as the model parameters to be adjusted.
In the embodiment of the application, when the stress monitoring value and the displacement monitoring value are inconsistent with the stress simulation value and the displacement simulation value, the model parameters need to be adjusted, and new and appropriate rock mechanical parameters of the coal rock mass are selected as the model parameters of the numerical model; at the moment, the stress monitoring value and the displacement monitoring value are respectively compared with stress calculation values and displacement calculation values in multiple groups of calculation data, a group of stress calculation values and displacement calculation values matched with the stress monitoring value and the displacement monitoring value are determined, rock mechanical parameters of the coal rock mass corresponding to the stress calculation values and the displacement calculation values are further determined according to the first mapping relation, and the rock mechanical parameters of the coal rock mass are used as new model parameters of the numerical model.
In the embodiment of the application, the model parameters in the numerical model are adjusted in a circulating iteration mode through comparison of the stress monitoring value and the displacement monitoring value with the stress simulation value and the displacement simulation value and based on the first mapping relation until the actual geological condition revealed in the lower-layer fully-mechanized coal mining dynamic stoping process is the same as the simulation result of the numerical model, and prediction guidance is conducted on the next mining through the adjusted numerical model.
And S133, evaluating the stability of the room-and-pillar type goaf coal pillars in the lower-layer coal fully-mechanized mining dynamic stoping process based on the numerical model after model parameter adjustment.
Specifically, simulation data of the room and column type goaf in the dynamic stoping process are simulated based on the numerical model after model parameter adjustment, and are compared with monitoring data of preset monitoring points of the room and column type goaf in the dynamic stoping process until the monitoring data of the room and column type goaf in the dynamic stoping process are consistent with the simulation data, so that dynamic stability evaluation is performed on the room and column type goaf.
In the embodiment of the application, a numerical model after model parameter adjustment is adopted to carry out analog simulation on the room and column type goaf in the dynamic stoping process to obtain new analog data of the coal pillar of the room and column type goaf, the stress analog value and the displacement analog value in the obtained new analog data are compared with the stress monitoring value and the displacement monitoring value at the preset monitoring point again, if the new stress analog value and the displacement analog value are consistent with the stress monitoring value and the displacement monitoring, the rock mechanical parameters of the coal rock mass currently used as model parameters are in accordance with reality, and the stability of the room and column type coal pillar is evaluated when the lower-layer coal fully-mechanized dynamic stoping goaf is excavated next step through the corresponding numerical model; if the new stress analog value and the displacement analog value are still inconsistent with the stress monitoring value and the displacement monitoring value, the rock mechanical parameters of the coal rock mass currently used as model parameters are still not consistent with reality, when the next excavation is carried out on the lower-layer coal fully-mechanized dynamic stoping through the corresponding numerical model, errors can be generated when the stability of the coal pillar in the room-and-column goaf is evaluated, so that the prediction is inaccurate, at the moment, the model parameters of the numerical model need to be adjusted again, the new suitable rock mechanical parameters of the coal rock mass are selected as the model parameters of the numerical model until the new stress analog value and the displacement analog value are consistent with the stress monitoring value and the displacement monitoring value, and the stability of the room-and-column goaf coal pillar can be evaluated when the next excavation is carried out on the lower-layer coal fully-mechanized dynamic stoping through the numerical model.
In the embodiment of the application, a first mapping relation between a plurality of groups of stress and displacement calculation values and a plurality of groups of model parameters of the room and column type goaf is established, and based on the established numerical model, simulation calculation is carried out on the room and column type goaf according to the rock mechanical parameters of each coal rock body of the room and column type goaf in the lower-layer coal fully mechanized mining dynamic stoping process to obtain the stress and displacement simulation values of the room and column type goaf; finally, comparing the stress and displacement monitoring values and the stress and displacement simulation values at the preset monitoring points of the room and column type goaf in the dynamic stoping process, and performing inversion to obtain rock mechanical parameters (rock mechanical parameters to be adjusted) of each coal rock mass; the method comprises the steps of inputting rock mechanical parameters (rock mechanical parameters to be adjusted) obtained through inversion into a pre-constructed numerical model, and respectively evaluating and predicting the stability of the room and pillar type coal pillars in the lower-layer coal fully-mechanized mining process, thereby fully considering the influence of disturbance of lower-layer coal fully-mechanized mining on the room and pillar type coal pillars, being capable of accurately evaluating the dynamic stability of the room and pillar type goaf coal pillars, preventing and controlling large-area room and pillar type goaf overhanging disasters, optimizing a roadway cofferdam construction supporting scheme, and providing scientific basis for avoiding accidents such as pressing frames and roof dynamic disasters.
FIG. 3 is a schematic flow chart of a room and pillar goaf stability dynamic evaluation method according to further embodiments of the present application; as shown in fig. 3, the method for dynamically evaluating the stability of the room and pillar type goaf is different from any one of the embodiments of the method for dynamically evaluating the stability of the room and pillar type goaf, and the method for dynamically evaluating the stability of the room and pillar type goaf further includes:
s301, constructing a second mapping relation between multiple groups of calculated data of the room and pillar type goaf and multiple groups of preset coal pillar safety factors;
in the embodiment of the application, when the first mapping relationship is established, the calculation data obtained according to the multiple groups of rock mechanical parameter sample data of each coal rock mass of the room and pillar type goaf can be simultaneously corresponding to the predetermined coal pillar safety coefficient, and the mapping relationship among the stress calculation value, the displacement calculation value and the safety coefficient of the coal pillar, that is, the second mapping relationship is established. Therefore, whether the room and column type goaf is safe or not can be rapidly determined through the stress calculated value and the displacement calculated value.
In the embodiment of the application, the ratio of the coal pillar damage degree of the room-and-pillar type goaf to the complete coal pillar is calculated every 500 m mined from the lower-layer fully-mechanized coal mining surface, and the safety coefficient of the corresponding coal pillar is obtained. The method comprises the steps of acquiring a group of rock mechanical parameter sample data of each coal rock mass every 500 meters for fully mechanized coal mining of the lower layer, and establishing a corresponding relation between a rock mechanical parameter sample data stress calculated value, a displacement calculated value and a safety coefficient of each coal rock mass.
Specifically, the safety factor of the coal pillar is calculated by a formula (1), wherein the formula (1) is as follows:
wherein the content of the first and second substances,
is coalThe safety factor of the column is that,
the area of the damaged structural surface in the room and pillar type goaf is shown,
and the area of the undamaged structural plane in the room and pillar type goaf is shown. Here, it is to be noted that
The coal pillar damage degree of the room and pillar type goaf is represented.
Step S302, according to the monitoring data at the preset monitoring point of the room and pillar type goaf in the dynamic stoping process and the second mapping relation, carrying out safety assessment on the room and pillar type goaf in the dynamic stoping process.
Specifically, during the dynamic stoping process of the lower-layer coal fully-mechanized mining according to the preset mining distance, the monitoring data of the preset monitoring point of the room and pillar type goaf and the second mapping relation perform dynamic safety assessment on the room and pillar type goaf during the dynamic stoping process.
In the embodiment of the application, the lower-layer coal fully-mechanized mining dynamic stoping is carried out according to the preset mining distance, and the rapid evaluation of the room and pillar type goaf in the dynamic stoping process is realized according to the stress monitoring value, the displacement monitoring value and the second mapping relation at the preset monitoring point when the lower-layer coal fully-mechanized mining dynamic stoping is carried out within the current mining distance. Specifically, stress monitoring value, displacement monitoring value and the stress calculation value, the displacement calculation value of coal column that will predetermine the monitoring point department match to according to assorted stress calculation value, displacement calculation value, confirm the factor of safety of coal column by the second mapping relation, and then realize the quick effective evaluation to dynamic stoping in-process room and column type collecting space area.
In the embodiment of the application, in the lower-layer coal fully-mechanized mining dynamic stoping process, the stress monitoring value and the displacement monitoring value at the preset monitoring point of the room and column type goaf are matched with the stress calculation value and the displacement calculation value, and then whether the room and column type goaf is safe or not in the lower-layer coal fully-mechanized mining dynamic stoping process is determined by establishing a second mapping relation among the stress calculation value, the displacement calculation value and the coal column safety factor of the room and column type goaf. The influence of the disturbance of the lower-layer coal fully-mechanized mining on the room and column type coal pillars and the dynamic stability of the room and column type goaf coal pillars are quickly judged, and the large-area room and column type goaf hanging roof disaster prevention and control can be quickly evaluated.
FIG. 4 is a schematic structural diagram of a room and pillar goaf stability dynamic evaluation system according to some embodiments of the present application; as shown in fig. 4, the room and pillar type goaf stability dynamic evaluation system includes: the first mapping unit 401 is configured to construct a first mapping relationship between multiple sets of calculation data and multiple sets of model parameters of the room and pillar type goaf; the calculation data comprise a stress calculation value and a displacement calculation value, and the model parameters are rock physical mechanical parameters of coal rock masses to be adjusted of a numerical model of the room and column type goaf which is constructed in advance; the simulation unit 402 is configured to obtain simulation data of the coal pillar of the room and pillar type goaf according to the mechanical parameters of each coal rock body of the room and pillar type goaf in the lower-layer coal fully mechanized mining dynamic stoping process based on the numerical model; wherein the simulation data comprises a stress simulation value and a displacement simulation value; an adjustment evaluation unit 403, configured to adjust model parameters of the numerical model according to the monitoring data at the preset monitoring point of the room and pillar type goaf in the lower-layer fully-mechanized coal mining dynamic stoping process, the simulation data, and the first mapping relationship, so as to perform dynamic stability evaluation on the room and pillar type goaf coal pillar; wherein the monitoring data comprises a stress monitoring value and a displacement monitoring value.
The room and column type goaf stability dynamic evaluation system provided by the embodiment of the application can realize the steps and the flow of any one of the above room and column type goaf stability dynamic evaluation method embodiments, and achieves the same technical effects, which are not repeated herein.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A room-and-pillar goaf stability dynamic evaluation method is characterized by comprising the following steps:
s101, constructing a first mapping relation between a plurality of groups of calculation data and a plurality of groups of model parameters of the room and pillar type goaf; the model parameters are rock mechanical parameters to be adjusted of each coal rock mass of a numerical model of the room-and-column type goaf constructed in advance;
step S102, based on the numerical model, obtaining simulation data of the coal pillar of the room-and-column type goaf according to the rock mechanical parameters of each coal rock body of the room-and-column type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process; wherein the simulation data comprises a stress simulation value and a displacement simulation value;
s103, adjusting model parameters of the numerical model according to monitoring data at preset monitoring points of the room and pillar type goaf, the simulation data and the first mapping relation in the lower-layer coal fully-mechanized mining dynamic stoping process so as to dynamically evaluate the stability of the room and pillar type goaf; the monitoring data comprises a stress monitoring value and a displacement monitoring value;
in step S103, adjusting model parameters of the numerical model according to the monitoring data at the preset monitoring point of the room and pillar type goaf, the simulation data and the first mapping relationship in the lower-layer fully-mechanized coal mining dynamic stoping process to perform dynamic stability evaluation on the room and pillar type goaf coal pillar, including:
s113, determining whether model parameters of the numerical model need to be adjusted according to monitoring data and the simulation data at preset monitoring points of the room-and-column type goaf in the lower-layer fully-mechanized coal mining dynamic stoping process;
step S123, responding to the requirement of adjusting model parameters of the numerical model, and determining model parameters to be adjusted in the numerical model according to the monitoring data based on the first mapping relation;
and S133, evaluating the stability of the room-and-pillar type goaf coal pillars in the lower-layer coal fully-mechanized mining dynamic stoping process based on the numerical model after model parameter adjustment.
2. The method for dynamically evaluating the stability of the room and pillar type goaf according to the claim 1, wherein in the step S101, a first mapping relationship between a plurality of sets of calculation data and a plurality of sets of model parameters of the room and pillar type goaf is constructed, specifically:
and constructing a first mapping relation between the calculation data corresponding to the multiple groups of rock mechanical parameter sample data and the multiple groups of model parameters based on the numerical model according to the multiple groups of rock mechanical parameter sample data of each coal rock mass of the room and pillar type goaf acquired in advance.
3. The method for dynamically evaluating the stability of the room and pillar type goaf according to the claim 1, wherein in step S102, the simulation data of the room and pillar type goaf are obtained according to rock mechanical parameters of each coal rock mass of the room and pillar type goaf in the lower-layer fully-mechanized coal mining dynamic stoping process based on the numerical model, specifically:
and according to the rock sample of the room and column type goaf in the dynamic stoping process, obtaining rock mechanical parameters of the room and column type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process, and obtaining a stress simulation value and a displacement simulation value of the room and column type goaf based on the numerical model.
4. The method for dynamically evaluating the stability of the room and pillar type goaf according to the claim 3, wherein in step S113, it is determined whether the model parameters of the numerical model need to be adjusted according to the monitoring data and the simulation data at the preset monitoring point of the room and pillar type goaf in the lower-layer coal fully mechanized mining dynamic stoping process, specifically:
and comparing the monitoring data of the preset monitoring point of the room and pillar type goaf with the simulation data in the lower-layer coal fully-mechanized mining dynamic stoping process, and determining to adjust the model parameters of the numerical model if the monitoring data is inconsistent with the simulation data.
5. The method for dynamically evaluating the stability of the room and pillar type goaf according to claim 3, wherein in step S123, the model parameters in response to the numerical model need to be adjusted, and based on the first mapping relationship and according to the monitoring data, the model parameters to be adjusted in the numerical model are determined, specifically:
and responding to the requirement of adjusting the model parameters of the numerical model, matching the monitoring data with the calculation data, and selecting the model parameters in the first mapping relation corresponding to the calculation data with consistent matching results as the model parameters to be adjusted.
6. The method for dynamically evaluating the stability of the room and pillar type goaf according to the claim 3, wherein in the step S133, the stability of the room and pillar type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process is evaluated based on the numerical model after model parameter adjustment, specifically:
simulating the simulation data of the room and column type goaf in the dynamic stoping process based on the numerical model after model parameter adjustment, comparing the simulation data with the monitoring data of the preset monitoring points of the room and column type goaf in the dynamic stoping process until the monitoring data of the room and column type goaf is consistent with the simulation data in the dynamic stoping process, and dynamically evaluating the stability of the room and column type goaf coal pillar.
7. The method for dynamically evaluating the stability of the room and pillar type goaf according to any one of claims 1 to 6, wherein the method for dynamically evaluating the stability of the room and pillar type goaf further comprises the following steps:
s301, constructing a second mapping relation between multiple groups of calculated data of the room and pillar type goaf and multiple groups of preset coal pillar safety factors;
step S302, according to the monitoring data at the preset monitoring point of the room and pillar type goaf in the dynamic stoping process and the second mapping relation, carrying out safety assessment on the room and pillar type goaf in the dynamic stoping process.
8. The method for dynamically evaluating the stability of the room and pillar type goaf according to claim 7, wherein in step S302, the safety of the room and pillar type goaf in the dynamic stoping process is evaluated according to the monitoring data at the preset monitoring point of the room and pillar type goaf in the dynamic stoping process and the second mapping relationship, specifically:
and in the dynamic stoping process of the lower-layer coal fully-mechanized mining according to the preset mining distance, carrying out dynamic safety assessment on the room and pillar type goaf in the dynamic stoping process according to the monitoring data at the preset monitoring point of the room and pillar type goaf and the second mapping relation.
9. The utility model provides a room and column type collecting space area stability dynamic evaluation system which characterized in that includes:
the first mapping unit is configured to construct a first mapping relation between a plurality of groups of calculation data and a plurality of groups of model parameters of the room and pillar type goaf; the model parameters are rock physical mechanical parameters of coal rock masses to be adjusted of a numerical model of the room-and-column type goaf constructed in advance;
the simulation unit is configured to obtain simulation data of the coal pillar of the room and pillar type goaf according to rock mechanical parameters of each coal rock body of the room and pillar type goaf in the lower-layer coal fully-mechanized mining dynamic stoping process based on the numerical model; wherein the simulation data comprises a stress simulation value and a displacement simulation value;
the adjustment evaluation unit is configured to adjust model parameters of the numerical model according to monitoring data at preset monitoring points of the room and pillar type goaf, the simulation data and the first mapping relation in the lower-layer coal fully-mechanized mining dynamic stoping process so as to dynamically evaluate the stability of the room and pillar type goaf; the monitoring data comprises a stress monitoring value and a displacement monitoring value;
the adjustment evaluation unit is further configured to determine whether model parameters of the numerical model need to be adjusted according to monitoring data and the simulation data at preset monitoring points of the room-and-pillar type goaf in the lower-layer fully-mechanized coal mining dynamic stoping process; responding to the requirement of adjusting model parameters of the numerical model, and determining model parameters to be adjusted in the numerical model according to the monitoring data based on the first mapping relation; and evaluating the stability of the room-and-column goaf coal pillars in the lower-layer coal fully-mechanized mining dynamic stoping process based on the numerical model after model parameter adjustment.
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| CN111677506A (en) * | 2020-05-26 | 2020-09-18 | 中煤科工开采研究院有限公司 | Method and device for realizing upward mining and recovering coal pillars in room-and-pillar type goaf |
| CN113216967A (en) * | 2021-05-28 | 2021-08-06 | 西安科技大学 | Opposite safe mining method for adjacent working faces under shallow-buried short-distance room-and-pillar type goaf |
| CN113836752A (en) * | 2021-11-25 | 2021-12-24 | 华北科技学院(中国煤矿安全技术培训中心) | Method and system for evaluating stability of pillar type coal pillars of multi-coal-seam room |
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| CN111677506A (en) * | 2020-05-26 | 2020-09-18 | 中煤科工开采研究院有限公司 | Method and device for realizing upward mining and recovering coal pillars in room-and-pillar type goaf |
| CN113216967A (en) * | 2021-05-28 | 2021-08-06 | 西安科技大学 | Opposite safe mining method for adjacent working faces under shallow-buried short-distance room-and-pillar type goaf |
| CN113836752A (en) * | 2021-11-25 | 2021-12-24 | 华北科技学院(中国煤矿安全技术培训中心) | Method and system for evaluating stability of pillar type coal pillars of multi-coal-seam room |
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