摘要
采空区覆岩大跨倾斜厚硬顶板失稳破断后可导致地表突然沉降、导水裂隙贯通,对下部采场冲击强烈,严重威胁采矿安全。以海孜煤矿为工程背景,采用理论分析、数值分析以及微震监测相结合的方法,探索了采空区覆岩大跨倾斜厚板结构失稳特征。建立力学模型,得到倾斜厚板发生破断时最大安全跨度的计算方法。根据UDEC数值模型以及微震监测结果,分析得到倾斜厚板破断的基本规律:即先在板中间位置底部发生拉张破裂,而后在两端形成剪切破裂区,且倾斜厚板的应力随着倾向长度的增加而增大,剪应力沿倾向呈对称分布在两侧达到最大值。
The long span inclined thick and hard roof strata instability of mined-out area can lead to sudden subsidence surface,lead water fracture penetration and strong impact on the lower stope,a serious threat to mining safety. Taking the Haizi coal mine as the research object,combine with the microseismic monitoring,the methods of theoretical analysis,numerical analysis are used to analyze the instablity characteristics of the long span inclined thick plate of mined-out area. The calculation method of the maximum safe span size of inclined plate fracture is obtained by establishing the mechanical mocel. The basic rule of the inclined plate fracture is analyzed based on the UDEC numerical model and the microseismic monitoring resutls,that is,the tensile rupture is happened firstly in the bottom of the location that near the middle of the inclined plate,then,the shear fracture zones are formed in the both ends of the incliend plate. Besides that,the stress of the inclined plate is increased with the increasing tendency length,the shear stress along the tendency of distribution is symmetrical and the maximum value is obtained in the both ends of the inclined plate.
出处
《现代矿业》
CAS
2015年第1期28-31,共4页
Modern Mining
基金
国家自然科学基金项目(编号:51274025)
关键词
倾斜厚板
解析计算
数值模拟
微震监测
Inclined plate
Analytic calculation
Numerical simulation
Microseismic monitoring
