厚表土立井井壁变形破坏规律及光纤监测分析  

Failure law of shaft lining in thick topsoil and fiber monitoring analysis

作　　者：庞明鑫 谢福星 袁帅 王苏龙 张杰 PANG Mingxin;XIE Fuxing;YUAN Shuai;WANG Sulong;ZHANG Jie(Jinneng Holding Shanxi Institute of Science and Technology Co.,Ltd.,Datong 037001.China;Beijing China Coal Mine Engineering Co.,Ltd.,Beijing 100013,China)

机构地区：[1]晋能控股山西科学技术研究院有限责任公司,山西大同037001 [2]北京中煤矿山工程有限公司,北京100013

出　　处：《煤矿安全》2022年第5期211-217,223,共8页Safety in Coal Mines

基　　金：北京中煤矿山工程有限责任公司科技创新资助项目(KJ-2021-JJZD-10,BMC-ZL-202009)。

摘　　要：以深部厚冲积层条件下某副井工程为研究对象,采用有限差分软件FLAC;对竖井开挖过程进行了数值模拟分析,并利用光纤监测方法监测了井壁不同深度位置的井壁竖向和径向应变及偏斜量变化规律。研究结果表明:垂向位移变化随着井筒开挖深度逐渐增大,呈非线性递增趋势;水平(径向)位移受到筒壁侧向压力影响,位移呈现增大趋势;井壁应变主要受到井壁温度变化的影响,监测结果呈现出拉、压应变来回交替变化趋势,监测后期该段井筒最大偏斜值为0.029 m,所有监测数值均处在安全允许范围内,因此井壁结构保持安全稳定状态。Taking an auxiliary shaft project under deep thick alluvial layer as the research object, the process of shaft excavation is simulated by using finite difference software FLAC;, and the variation rules of vertical and radial strain and deflection of shaft wall at different depths are monitored by using optical fiber monitoring method. The results show that: the displacement changes show a nonlinear increasing trend with the increase of shaft excavation depth;the horizontal radial displacement is affected by the lateral pressure of the cylinder wall, and the displacement tends to increase;the monitoring results of shaft wall strain are mainly influenced by the change of shaft wall temperature, and the tensile strain and compressive strain alternate back and forth. The maximum deviation value of the shaft in the later period of monitoring is 0.029 m, and all the monitored values are within the allowable range of safety, so the shaft wall structure remains safe and stable.

关 键 词：井筒开挖 数值模拟 径向位移 光纤监测 井筒偏斜 

分 类 号：TD326.2[矿业工程—矿井建设]