摘要
为了研究煤层厚度区在开采过程中对冲击地压发生概率的影响,基于FLAC3D数值模拟软件,分别模拟了工作面和煤厚变化区在不同距离下应力分布规律以及不同煤层厚度变化下煤厚变化区内支承压力与弹性应变能的分布规律。研究结果表明,煤层厚度相同时,工作面和煤厚局部变化区的距离从90m逐渐变为20m的过程中,超前支撑应力将会逐渐向变薄区传递且变薄区储存的能量明显高于变厚区,当煤厚分别从8m逐渐变为6m、4m和2m的过程中,煤厚变化率越大,煤厚变化区的应力集中度也将越大,由此冲击地压的发生机率也将大幅度提高,即煤厚变化区发生冲击地压的概率与煤厚变化率的增加呈正相关。
To understand the effect of coal thickness varying areas on the probability of occurrence of rock burst,the numerical simulation software FLAC3 D is applied to simulate the distribution rules of stress in the working face and the coal thick varying areas in different distances,and that of the support pressure and the elastic strain energy in the coal thick varying areas with different thicknesses. The results from the research demonstrate that,in the case of the same coal thickness,in the process of the distance between the working face and the coal thickness locally varying area becoming from 90 m to 20 m gradually,the fore support stress will spread gradually to the thinning area and the energy stored in the thinning area is obviously higher than that in the thickening area,and in the process of the coal thickness turning from 8 m to6 m,4 m and 2 m gradually,the higher the change rate of the coal thickness,the bigger the stress concentration in the coal thickness varying area,thus the probability of occurrence of rock burst soaring,i.e. the probability of occurrence of rock burst is positively correlated to the increase of the change rate of the coal thickness in the coal thickness varying area.
作者
孙连胜
高玉良
Sun Liansheng;Gao Yuliang(Cuncaota Coal Mine,CHN Energy Shendong Coal Group Corporation,Erdos,Inner Mongolia,017000)
出处
《能源科技》
2020年第7期24-28,共5页
Energy Science and Technology
关键词
煤厚化区
冲击地压
数值模拟
弹性应变
Coal thickness varying area
Rock burst
Numerical simulation
Elastic strain
