摘要
为了确定上覆工作面采动对底板巷道稳定性的影响程度,首先,以海孜煤矿7煤工作面开采为例,根据其工作面支承压力分布形态,基于弹性力学理论建立了底板应力分布的力学模型,分析了采动支承压力在底板中的传递规律,并将采动支承压力与巷道围岩应力有机结合在一起,得到了上覆工作面开采过程中,底板巷道围岩的最大、最小主应力集中系数的变化规律,开采过程中围岩最大主应力集中系数的极值为1.28;其次,应用数值模拟软件FLCA3D建立了跨采巷道计算模型进行了验证,得出巷道围岩最大主应力集中系数极值为1.22,结果证明理论模型是可靠的。此模型可为底板巷道围岩控制提供基础的理论和技术支持。
In order to determine the influence of overlying face mining on stability of the floor roadway,first,taking the working face of No.7 seam on Haizi colliery as an example,according to the abutment pressure distribution of the working face,a mechanical model about stress distribution in the floor was established based on the elasticity theory. This paper analyzed transmission law of mining abutment pressure in the floor,and combined mining abutment pressure with roadway surrounding rock stress. In the mining process of overlying working face,the maximum,minimum principal stress concentration factors of floor roadway surrounding rock were obtained,and the maximum principal stress concentration factor was 1.28. Then a computing model of roadway was established by numerical simulation software,the maximum principal concentration factor of surrounding rock obtained was 1.22,and the results proved that the theoretical model was reliable. This model could provide a basic theory and technology support for the floor roadway surrounding rock control.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第3期658-664,共7页
Chinese Journal of Underground Space and Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB226805)
国家自然科学基金项目(51074004)
山东省矿山灾害预防控制国家重点实验室培育基地(山东科技大学)开放基金资助(MDPC2012KF06)
关键词
跨采
支承压力
底板巷道
应力集中系数
cross mining
abutment pressure
floor roadway
stress concentration factor
