标题：Stability of strip pillar disturbed by dynamic load
作者：Zhaodong, Wang ;Tao, Zhong ;Jian, Hao
作者机构：[Zhaodong, Wang ] Liaoning technical University, College of mining engineering, Fuxin, China;[Tao, Zhong ] Nantun Coal Mine, Yanzhou Coal Mining Compa 更多
来源：Electronic Journal of Geotechnical Engineering
摘要：Strip mining, whose stability is disturbed by static load as well as dynamic load, has been used widely in china especially in "three under coal seam"(coal seam under buildings, waters, and railways). Though static stability of strip mining has been studied maturely, theory about dynamic stability,which is of great significance for strip pillar's designing, has not convinced scholars. In order to reveal strip-pillar's dynamic response rule, coal pillar's stress distribution rule under dynamic vertical stress wave was illuminated theoretically, dynamic disturbance's influence on coal pillar's stability was revealed, dynamic response results of coal pillar was numerical simulated under condition of different stress intensity and frequency. Results shows that, disturbed by dynamic wave, plastic zone's width would increase but width of coal pillar's nuclear zone would decrease, stress in nuclear zone would become greater under the work of dynamic-static load, coal pillar's instability and failure would be caused. Dynamic stress wave's influence on particles at coal pillar's edge is stronger than the internal particles while stress wave was applied, coal pillar edge's stress variation range is much larger than internal particles. Disturbed by stress wave, plastic zone would appear at the edge of coal pillar earliest and develop from outside to inside. With the increasing of stress wave's strength, vertical stress peak would increase, coal pillar's plastic zone would develop catastrophically, that is coal pillar's instability would happened when stress wave's intensity reach a threshold. When stress wave's frequency is equal to model natural's frequency, the coal pillar's plastic zone is the largest and the frequency had the strongest influence on coal pillar's stability. © 2014 ejge.