Study on mechanics model of overburden large structure of fully-mechanized sublevel coal caving face
Fully-mechanized sublevel coal caving face full-seam mining thickness is increasing;the movement range of overburden stratum also increasing,most obvious character is the more capacious range and more large span overburden large structure that formed in the higher position.This paper analyzed the formation of fully-mechanized sublevel coal caving face overburden large structure by using the new research production of underground pressure theory Key stratum theory,elasticity mechanics and structure mechanics theory,brought forward its conception and model,and carried through mechanics analysis on the model,and presented the two possible movement patterns mechanics criterion of overburden large structure,presented the directional distributing of normal stress,shearing stress and extrusion & compression stress along the span and height of overburden large structure.Based on the two type of basic form of the overburden stratum movement brought forwards by Academician Song Zhen-qi,analyzing the possible movement tendency of overburden large structure: ① It was ripped in the pedestal negative bending moment stratum,and two end embed beam model translate into simply supported beam model,moreover rupture in the middle part;② shear destroy,and get the ultimate span of the two citcs separately.
Fully-mechanized sublevel coal caving Overburden large structure Key stratum
Li Shaogang Liu Baoguo Zhang Kaizhi
School of Civil Engineering and Architecture BJTU,Beijing 100044,China Key Laboratory for Prevention and Control of Mine Disaster,SDUST,Qingdao 266510,China
国际会议
The 2007 International Conference on Mine Hazards Prevention and Control(2007矿山灾害预防与控制国际学术会议)
青岛
英文
276-281
2007-10-17（万方平台首次上网日期，不代表论文的发表时间）