高速公路下伏采空区稳定性离散单元法分析

摘要

Yushen expressway is 88 km long, going through 9 mines with goaf. The goaf with pillar width and pillar intervals of 6-15m are all mined by room and pillar method and the overburden ranges 50-120m. This paper employed the discrete element code UDEC to simulate the stability of goaf under expressways. It investigated the patterns of overburden movement and surface subsidence due to the excavation of goaf, and analyzed major influential factors on goaf stability like goaf over drilling and expressway loadings.%榆神高速公路全长约88km,路经9个煤矿采空区.采空区均由品字形房柱式开采而成,埋深介于50～120m之间,房柱宽度和间距最小为6m,最大15m.采用离散单元法对榆神高速公路下伏采空区进行稳定性分析,探讨了采空区开挖后上覆岩体的移动和地表下沉规律,并对影响采空区稳定性的采空区超采和高速公路荷载进行了剖析.