岩土力学2017，Vol.38Issue(3)：723-730,8.DOI:10.16285/j.rsm.2017.03.014
非均布荷载作用下煤岩力学强度特性试验研究
Experimental study of strength properties of coal-rock under non-uniformly distributed load
摘要
Abstract
The strength characteristics of coal-rock under non-uniform distributed load are investigated using a self-developed mining-induced stress testing system under different conditions of initial vertical stresses,initial horizontal stresses and stress transfer velocity.The results show that the external damaged coal-rock block has strengthened effect on the bearing capacity of internal coal-rock blocks.When the initial vertical stress,the initial horizontal stress and the stress transfer velocity are fixed,the intemal bearing capacity of coal-rock is approximately twice that of the external coal-rock.With the increase of the initial vertical stress,the later period bearing capacity of the whole coal-rock is reduced and is located in the range of different initial vertical stress.There exists a difference in decreasing characteristics between intemal-and external coal-rock.When under a lower initial vertical stress range,the reduction of strength of external coal-rock in the later period is higher than that of internal coal-rock.When under a relatively high initial vertical stress range,the reduction of mechanical strength of external coal-rock in the later period is lower than that of internal coal-rock.The higher the initial horizontal stress is,the higher the bearing capacity of coal-rock is.No matter in a higher or lower initial stress range,the incremental quantity of the later period bearing capacity of internal rock-coal is larger than that of external rock-coal.With the increase of stress transfer velocity,the peak strength of coal-rock is increased,and the effect of stress transfer velocity on the mechanical properties of intemal coal-rock is more significant.关键词
非均布荷载/力学强度/初始垂向应力/初始水平应力/应力转移速度Key words
non-uniform distributed load/mechanical strength/initial vertical stress/initial horizontal stress/stress transfer velocity分类
建筑与水利引用本文复制引用
王晓,文志杰,MIKAEL Rinne,沈宝堂,谢军..非均布荷载作用下煤岩力学强度特性试验研究[J].岩土力学,2017,38(3):723-730,8.基金项目
国家自然科学基金(No.51304126) （No.51304126）
国家重点研发计划(No.2016YFC0600708-3) （No.2016YFC0600708-3）
国家重点试验室开放基金(No.SKLGDUEK1520) （No.SKLGDUEK1520）
霍英东青年教师基金(No.141046) （No.141046）
中国博士后基金(No.2013M541918) （No.2013M541918）
2015年度山东省高等学校科技计划(No.J15LH04).This work was supported by the National Natural Science Foundation of China (51304126),the State Key Research Development Program of China(2016YFC0600708-3),the State Key Laboratory of Open Funds under Grant (SKLGDUEK1520),the Fok Ying Tung Education Foundation (141046),China Postdoctoral Science Foundation (2013M541918),and Shandong Province Higher Educational Science and Technology Program (J15LH04). （No.J15LH04）
