摘要
煤矿采动过程中三维应力重新分布,冲击地压等灾害的发生与应力集中密切相关。为了研究开采过程中煤层顶板三维应力的变化规律,采用光纤光栅三维应力传感器,首先测量了原岩应力,随后构建了采场围岩三维应力在线监测系统,监测得到了工作面推进过程中的顶板岩层三维应力。结果表明:监测断面处,原岩应力主要受构造作用影响;随着工作面的推进,前方上覆岩层三个方向正应力均不断增加,且垂直方向正应力变化大于水平方向正应力;采动影响范围为工作面前方120 m左右,急剧影响范围为工作面前方50 m左右,应力峰值位置在工作面前方18 m内;垂直方向正应力在应力峰值处增加了约147%,其变化规律与传统矿山压力理论较为吻合。
The three-dimensional stress redistribution in coal mining process and the occurrence of rockburst and other disasters are closely related to stress concentration. In order to analyze the variation of three-dimensional stress in coal seam roof during mining,field monitoring test was carried out. In the field test,three-dimensional stress sensor based on fiber Bragg grating was adopted. Firstly,the original rock stress was measured. Then,the three-dimensional stress of rock on-line monitoring system was constructed,and the three-dimensional stress of roof strata in the process of mining was monitored. The results show that the original rock stress is mainly affected by tectonism in the monitoring sections. With the advancing of working face,the normal stress in three directions in overlying strata increases continuously. The change of the normal stress in the vertical direction is greater than that in the horizontal direction. The mining influence scope is about 120 meters in front of the working face,the rapid influence scope is about 50 meters in front of the working face. The stress peak position is within 18 meters in front of the working face. The vertical normal stress increases by about 147% at the stress peak position,and its variation law is in good agreement with the traditional theory of mine pressure.
作者
曹怀轩
CAO Huaixuan(Dongtan Coal Mine,Yanzhou Coal Mining Company Limited,Zoucheng,Shandong 273500,China)
出处
《水利与建筑工程学报》
2019年第4期112-116,共5页
Journal of Water Resources and Architectural Engineering
关键词
岩层
应力
监测
冲击地压
rock
stress
monitoring
rockburst
