采矿与安全工程学报2013，Vol.30Issue(2)：251-255,5.
不同侧压系数对动载诱发巷道底板冲击的影响
Study on the effect of floor burst induced by dynamic disturbance at different lateral pressure coefficients
摘要
Abstract
In order to reveal the influence of lateral pressure coefficients on floor burst induced by dynamic disturbance, dynamic response rules and burst process of floor in extra-thick coal seam induced by dynamic disturbance at different lateral pressure coefficients were studied by using the rock mechanics and FLAC2D finite difference numerical software. The results show that the ultimate stress equilibrium in floor can be disturbed by dynamic loads so that floor burst is induced. With the increase of the lateral pressure coefficients, critical horizontal stress and maximum stress difference of floor will increase linearly, maximum vertical displacement of floor will increase nonlinearly if λ < 2.0 and then decrease slightly as λ > 2.0 under dynamic loads. These indicate that instability difficult degree is not positively correlated with burst strength for floor completely. The floor burst process is: 1) horizontal stresses reaches critical value instantly, 2) plastic area extends, 3) elastic energy releases rapidly, 4) vertical displacement of floor increase suddenly, 5) the floor burst occurs. The conclusions will provide reference for the study on mechanism of floor burst and its prevention in the same conditions.关键词
底板冲击/侧压系数/动载扰动/数值模拟Key words
floor burst/ lateral pressure coefficients/ dynamic disturbance/ numerical simulation分类
矿业与冶金引用本文复制引用
谢龙,窦林名,吕长国,于贵良,王毅..不同侧压系数对动载诱发巷道底板冲击的影响[J].采矿与安全工程学报,2013,30(2):251-255,5.基金项目
国家重点基础研究发展计划(973)项目(2010CB226805) （973）
国家"十二五"科技支撑计划项目(2012BAK09B01) （2012BAK09B01）
国家自然科学基金和神华集团有限公司联合资助项目(51174285) （51174285）
煤炭资源与安全开采国家重点实验室自主研究课题项目(SKLCRSM10X05) （SKLCRSM10X05）
江苏高校优势学科建设工程项目 （）
