摘要
河北唐山矿冲击地压的发生除了受开采技术条件、煤层顶底板岩石学特征等因素影响外,主要受赋存环境的影响,其中地应力条件是一个重要的影响因素。以唐山矿构造应力分布规律为背景,对不同水平构造应力条件下回采工作面煤层及其顶底板围岩的三维场进行了数值分析,系统研究了构造应力对煤层及其顶底板围岩的冲击地压的影响。结果表明,在煤矿开采过程中,高水平构造应力对采区煤层及其顶底板围岩的应力场和能量场的分布规律具有重要影响。高构造应力条件下,煤层及其顶底板围岩中的高水平应力为冲击地压的发生提供了力源条件,而在高地应力环境下所积聚的大量弹性应变能为冲击地压的发生提供了能量条件。
Occurrence of rock burst in Tangshan mining area is not only controlled by mining conditions, roof con- trolling methods and lithologic characters of roof and floor, but also influenced by the environmental factors such as tectonic stress, ground water and so on. Among them, tectonic stress is one of the important factors to influence the potential of coal and rock burst during coal mining. Based on the field data of geological structures and occur- rences of rock burst in Tangshan mining area, three-dimensional fields in coal bed and its surrounding rock were modeled and analyzed under different tectonic stress conditions by using numerical modeling software FLAC3D. Results show that tectonic stress has obvious influence on the distribution of stress field and energy field in coal bed and its surrounding rock. Under high structural stress conditions, high horizontal stress is the source of force and elastic strain energy stored in coal bed and its surrounding rock is the source of energy to induce to rock burst during coal mining.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2012年第6期34-38,共5页
Coal Geology & Exploration
基金
河南省重点科技攻关项目(082102290017)
河南省高等学校青年骨干教师资助计划项目(2009GGJS-038)
关键词
构造应力
冲击倾向性
冲击地压
数值分析
弹性应变能
tectonic stress
bursting potential
rock burst
numerical study
elastic strain energy
