摘要
为解决随机分布节理面力学参数的科学估算,在实验室内选用不同粒径级配的破碎岩块进行压缩,获得不同压实率下的压实体试件。对压实体进行单轴压缩试验,记录其轴向应力应变曲线的同时分析压实体节理迹长概率分布函数和范围;其次,通过正交试验和数值模拟的方法构造单轴压缩数值模型,选用与试验轴向应力应变曲线最接近的模拟曲线的节理力学参数,作为该压实体的节理力学参数。最后结合实际现场,利用得到的压实体节理力学参数,研究不同压实程度下再生顶板巷道顶板稳定性。得出了在破碎岩块粒径越小,压实率越大的情况下,再生顶板越稳定的结论。
In order to solve the scientific estimation of mechanical parameters of randomly distributed joint surfaces,in the laboratory,fractured rock blocks with different particle size gradations are selected to compress and obtain compacted solid specimens with different compaction rates;uniaxial compression experiments are carried out on compacted solid to record its axial stress-strain curves and analyze the probability distribution function and range of joint trace length;secondly,through orthogonal test and numerical simulation,the uniaxial compression numerical model was constructed,and the joint mechanical parameters of the simulated curve closest to the experimental axial stress-strain curve were selected as the joint mechanical parameters of the compression body.Finally,the roof stability of regenerated roof roadway under different degrees of compaction is studied by using the mechanical parameters of joints obtained from the actual site.It is concluded that the recycled roof is more stable when the particle size of the crushed rock is smaller and the compaction rate is higher.
作者
王泽雨
王同旭
宋学峰
马文强
WANG Zeyu;WANG Tongxu;SONG Xuefeng;MA Wenqiang(College of Mining and Safety Engineering,Shandong University of Science and Technology,Qingdao 266590,China;State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao 266590,China;Xinyang Normal University,Xinyang 464000,China)
出处
《煤矿安全》
CAS
北大核心
2019年第12期23-27,共5页
Safety in Coal Mines
基金
山东省重点研发计划资助项目（2015GSF116012）
山东省自然科学基金资助项目（ZR2016EEM36）
关键词
破碎压实岩体
节理力学参数
数值模拟
随机节理网络
正交试验
再生顶板
fractured compacted rock mass
joint mechanical parameter
numerical simulation
random joint network
orthogonal test
recycled roof
