Internal Deformation and Failure Evolution Law of Pillar in Stope
In this paper, the transverse deformation of strip coal pillar is observed at different depths before and after the adjacent workface mining. According to the observations, strip coal pillar can be divided into elastic core zone, plastic failure zone and completely failure zone. The range of completely failure zone is about 1m and the width of plastic failure zone is ranging from 4m to 5m. Elastic core zone supports roof and overlying strata primarily and directly. Plastic failure zone supports roof and overlying strata subsidiary and indirectly through restricting transverse deformation of elastic core zone. Completely failure zone cant support roof and overlying strata on the edge of pillar but just plays a minor role in the horizontal constraint to plastic failure zone with caving gangue of gob and broken roof. The load of strip coal pillar bearing is largest at the front and back of workface and reduces after gobs roof caving. That shows those gobs caved roof have a support role to overlying strata, which reduces the pressure on the strip pillar of overlying strata. The deformation and failure will maintain a longer period of time after pillar entering into gob. The real state of strip pillar before and after mining can be realized through observing its transverse deformation of strip coal pillars of different depths, which has certain significance on understanding the stability performance of pillar and controlling the disaster induced by the pillar collapse.
stope coal pillar transverse deformation failure characteristics support performance evolution law
SHAO-JIE CHEN WEI-JIA GUO FA-ZHU LI ZHONG CAO BO LI
Key Laboratory of Mine Disaster Prevention and Control,Shandong University of Science and Technology Daizhuang Colliery,Zibo Mining Group Co.,Ltd,P.R.China
国际会议
大连
英文
313-316
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）