Method for analyzing factors influencing contribution rate of roof plate resilience during coal disaster

Abstract

A method for analyzing factors influencing the contribution rate of roof plate resilience during a coal disaster; the specific steps are: obtaining coal seam gas pressure; according to a drilling hist

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a method for analyzing factors influencing the contribution rate of roof plate resilience during a coal disaster. BACKGROUND

[0002] China is the largest producer and consumer of coal in the world, and coal plays an important role in the energy structure of China. Although a series of corresponding prevention and control measures have been taken, mine dynamic disasters involving coal and rock gas still occur. In the final analysis, the understanding of the mechanism of coal and rock gas disasters is not clear and perfect enough.

[0003] At present, the research on mine dynamic disasters (coal and gas outburst, rock burst) usually focuses on the role of coal itself and gas. On the one hand, the related research conducts analysis only based on the stress and gas situation of the coal seam and directly ignores the roof plate resilience. On the other hand, a rough estimate is only given, but in fact, there is no reasonable calculation and evaluation method for the participating resilience of the roof plate, especially under deep mining conditions. The problems of high ground stress, high temperature and high gas in deep mining increase the risk of coal and gas outburst and the coal and rock impact, which further increases the probability of complex coal and rock dynamic disasters in some high-gas mines and coal and gas outburst mines. Such disasters not only show some characteristics of coal and gas outburst, but also some characteristics of rock burst. The two dynamic disasters coexist, influence and compound with each other. At the same time, the deep composite coal and rock dynamic disaster is a complex mechanical process under the dual effects of "high stress (ground stress) and dynamic disturbance (depressurized mining)". Many factors are intertwined in the process of disaster occurrence, which may lead to mutual inducement, mutual reinforcement or "resonance" effect in the process of accident preparation, occurrence and development. Thus, the mechanism of composite dynamic disasters is more complicated. It is more important to know the specific participation role of resilience of rocks in the process of disasters.

[0004] Based on this, the present disclosure provides a method for analyzing factors influencing the contribution rate of roof plate resilience during a coal disaster. SUMMARY

[0005] Aiming at the shortcomings of the prior art, the present disclosure provides a method for analyzing factors influencing the contribution rate of roof plate resilience during a coal disaster, which establishes an expression of the contribution rate of the roof plate resilience and analyzes its influencing factors, and provides a certain theoretical basis for accurate prevention and control of coal and rock gas dynamic disasters.

[0006] A method for analyzing factors influencing the contribution rate of roof plate resilience during a coal disaster is provided, including the following steps:

[0007] Step 1, calculating the contribution rate of the roof plate resilience:

[0008] ( x) obtaining gas-containing coal seam gas pressure ; h

[0009] I*2) according to a drilling histogram, obtaining gas-containing coal seam thickness c h and roof plate thickness r \ q

[0010] ( 3) coring the gas-containing coal seam and the roof plate, processing the core into a pi standard test piece, and obtaining, by means of a mechanical test, elastic moduli r of the roof plate and elastic moduli c of the coal seam under the influence of the gas pressure , respectively; q n

[0011] (4) calculating the contribution rate ' of the roof plate resilience according to the data Q C obtained in step ( x) to step ( 3),

[0012] ri = A-EchJ(Echr+Erhc)xW0° / o (1)

[0013] in formula (1), is a correction factor, and hr an(j ha , Er an(j Ec satisfy formula (2): {hr = mhc Er = nEc 1 — 1 (2)

[0015] in formula (2), anc[ >0. substituting formula (2) into formula (1) to obtain:

[0016] 77 = 2-w / (m + w)xl00% (3)

[0017] Step 2, analyzing the influence factor of the contribution rate of the roof plate resilience: th n

[0018] according to formula (3), analyzing the influence of and on the contribution rate of the roof plate resilience, wherein the following two situations are configured: TH fl f)

[0019] situation 1: the influence of the same but different on '; fl TH fl

[0020] situation 2: the influence of the same but different on '; TH fl fl

[0021] obtaining the comprehensive influence of and on the contribution rate ' of the roof plate resilience according to situation 1 and situation 2 respectively.

[0022] The present disclosure has the following beneficial effects.

[0023] 1) According to the actual situation on site, the present disclosure puts forward a method for analyzing factors influencing the contribution rate of roof plate resilience during a coal disaster, which establishes an expression and provides a certain theoretical basis for accurate prevention and control of coal and rock gas dynamic disasters.

[0024] 2) It is simple and convenient to calculate the contribution rate of the roof plate resilience provided by the present disclosure, which can be obtained only by measuring the relevant mechanical indexes of a coal and rock monomer containing gas.

[0025] 3) At the same time, the present disclosure puts forward the factors influencing the contribution rate of the resilience and carries out relevant analysis based on this, so as to further clarify and quantify the main factors influencing the contribution rate of the resilience.

[0026] 4) The present disclosure fully considers the influence of the roof plate resilience in coal and rock dynamic disasters and has important theoretical significance and practical engineering value. Moreover, the present disclosure has positive significance for the prediction and prevention of mining-induced rock burst-coal and gas outburst and other complex dynamic mining disasters. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG. 1 is a flow chart of a method for analyzing factors influencing the contribution rate of roof plate resilience during a coal disaster.

[0028] FIG. 2 is an influence distribution diagram of parameter TH on Tj according to an embodiment of the present disclosure.

[0029] FIG. 3 is an influence distribution diagram of parameter fl on 7] according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to fully embody the features and advantages of the present disclosure, the present disclosure will be described in detail with reference to the attached drawings and specific embodiments.

[0031] As shown in FIG. 1 to FIG. 3, a method for analyzing factors influencing the contribution rate of roof plate resilience during a coal disaster is provided, including the following steps:

[0032] Step 1, calculating the contribution rate of the roof plate resilience: O P

[0033] (1) obtaining gas-containing coal seam gas pressure r;

[0034] (^2) according to a drilling histogram, obtaining gas-containing coal seam thickness and roof plate thickness r \ q

[0035] ( 3) coring the gas-containing coal seam and the roof plate, processing the core into a standard test piece, and obtaining, by means of a mechanical test, elastic moduli r of the roof plate and elastic moduli c of the coal seam under the influence of the gas pressure f , respectively; q n

[0036] (4) calculating the contribution rate ' of the roof plate resilience according to the data obtained in step ( x) to step ( 3),

[0037] ri = A-EchJ(Echr+Erhc)xW0° / o (1)

[0038] in formula (1), is a correction factor, and hr an(j hc , Er an(j Ec satisfy formula (2): {hr = mhc Er = nEc |uujv| (2)

[0040] in formula (2), anc[ substituting formula (2) into formula (1) to obtain:

[0041] 77 = 2-w / (m + w)xl00% (3)

[0042] Step 2, analyzing the influence factor of the contribution rate of the roof plate resilience: Tti n

[0043] according to formula (3), analyzing the influence of and on the contribution rate Tj of the roof plate resilience, wherein the following two situations are configured: TTl fl fl

[0044] situation 1: the influence of the same but different on '; fl TTL fl

[0045] situation 2: the influence of the same but different on '; TTl fl fl

[0046] obtaining the comprehensive influence of and on the contribution rate ' of the roof plate resilience according to situation 1 and situation 2 respectively.

[0047] Embodiment TTl fl fl

[0048] In order to further analyze the specific influence of and on ', the analysis is carried out within the m range of [0.1,10] and the n range of [0.1,12], and the value of A is 1, which is divided into the following two situations. TTl

[0049] Situation 1: the influence of the same layer thickness but different elastic modulus n 1] on '.

[0050] It can be seen from FIG. 2 that when the ratio of thickness of the rock to the coal is the same (equal to ni) in a two-body combined structure, the greater the ratio n of the elastic modulus of the rock to the coal, the smaller the contribution rate f] of the roof plate resilience. However, the overall contribution rate of the roof plate resilience increases with the increase of the ratio m of the thickness of the rock to the coal.

[0051] Situation 2: the influence of the same n but different TTl on the contribution rate 7] of the roof plate resilience.

[0052] It can be seen from FIG. 3 that when the ratio of the elastic modulus of the rock to the coal is the same (equal to ri) in a two-body combined structure, the greater the ratio m of the thickness of the rock to the coal, the greater the contribution rate Tj of the roof plate resilience. However, the overall contribution rate 7 / of the roof plate resilience decreases with the increase of the ratio n of the elastic modulus of the rock to the coal, but the decreasing trend gradually slows down.

[0053] Although the specific embodiment of the present disclosure has been described with the attached drawings, it is not a limitation on the scope of protection of the present disclosure. Those skilled in the art should understand that on the basis of the technical scheme of the present disclosure, various modifications or transformations that can be made by those skilled in the art without creative labor are still within the scope of protection of the present disclosure.

Claims

WHAT IS CLAIMED IS:

1. A method for analyzing factors influencing the contribution rate of roof plate resilience during a coal disaster, comprising the following steps:Step 1, calculating the contribution rate of the roof plate resilience:(Si) obtaining gas-containing coal seam gas pressure P;( s2) according to a drilling histogram, obtaining gas-containing coal seam thickness hc and roof plate thickness hr \( S3 ) coring the gas-containing coal seam and the roof plate, processing the core into a standard test piece, and obtaining, by means of a mechanical test, elastic moduli Er of the roof plate and elastic moduli ec of the coal seam under the influence of the gas pressure p , respectively;(sO calculating the contribution rate 1] of the roof plate resilience according to the data obtained in step ) to step (s3),77 = 2- Echr / (Echr + ErAc)x 100% (1)in formula (1), A is a correction factor, and 0<A^l; and hc, Er and ec satisfy formula (2):hr Tn / hcEr = nEc ( }in formula (2), 771 >0 and K >0; substituting formula (2) into formula (1) to obtain:77 = 2-w / (m +w)x 100% (3)Step 2, analyzing the influence factor of the contribution rate of the roof plate resilience: according to formula (3), analyzing the influence of 772. and H on the contribution rate 1) of the roof plate resilience, wherein the following two situations are configured:situation 1: the influence of the same 7M but different W on ;situation 2: the influence of the same but different 171 on 1];obtaining the comprehensive influence of 171 and n on the contribution rate 1) of the roof plate resilience according to situation 1 and situation 2 respectively.

Images