基于薄板理论的浅埋大面积采空区稳定性研究  

Stability of Goaf with Shallow Buried and Large Area Based on Thin Plate Theory

作　　者：林惠立[1,2] 

机构地区：[1]煤炭科学技术研究院有限公司安全分院,北京100013 [2]煤炭资源高效开采与洁净利用国家重点实验室(煤炭科学研究总院),北京100013

出　　处：《煤矿开采》2016年第3期28-30,105,共4页Coal Mining Technology

基　　金：国家自然科学基金青年基金(51404139)

摘　　要：为研究浅埋大面积房采采空区的稳定性,基于弹性薄板理论建立了大面积采空区失稳力学模型,得到了不同基岩层厚度下采空区极限悬顶面积的变化规律。结果表明:在相同采空区长度时极限悬顶面积都随基岩厚度的增加而增加;基岩厚度为10m,15m时,极限悬顶面积随采空区长度增加有小幅度的增加;基岩厚度20m时,采空区长度小于160m时极限悬顶面积极大,大于160m后极限悬顶面积随采空区长度增加有小幅度增加。研究结果表明,在基岩层厚度为15m的情况下,只要保证采空区短边长度在130m之内,就可以保证采空区顶板不会垮落,相应的极限悬顶面积保持在20000m2左右。该结果可为采空区治理提供理论依据。In order to solving the stability of large amount area goaf with room and pillar mining and shallow buried, the mechanics model of large area goaf instability was built on the basis of flexible thin plate theory, then the change principle of the largest unsup- ported area of goal under different base rock thickness was put forward. The results showed that the largest unsupported roof area in- creased with base rock thickness increased at the same length of goat＇, when base rock thickness were lOre and 15m, the largest un- supported roof area increased minor with goaf length increased, the unsupported roof was the largest when goal length small than 160m, the largest unsupported roof area increased minor with goaf length increased as the goaf length more than 160m. The studying results showed that when base rock thickness was 15m, the roof of goaf would not collapse as the short side length was no more than 130m, the largest unsupported area was 20000m2 at the same time, the results could be as theoretical foundation of goaf prevention.

关 键 词：薄板理论 大面积采空区 失稳机理 顶板垮落 悬顶面积 

分 类 号：TD327.2[矿业工程—矿井建设]