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以华蓥山高速公路隧道为研究对象,采用FLAC3D有限差分软件进行三维建模,分析距隧道不同距离的侧部采空区对隧道的影响,以此研究隧道侧穿采空区的安全距离。研究结果表明:随着采空区与隧道间的距离的不断增大,隧道主要特征位置的位移值均有不同程度的减小,最终趋于无采空区状态时的位移;隧道与相邻采空区之间的围岩是最容易破坏的区域;隧道侧穿采空区的安全距离大约为隧道跨度的1.5倍。
Taking Huayingshan expressway tunnel as the research object, the FLAC3D finite difference software was used to carry out 3D modeling, and the influence of side gobs with different distances from the tunnels on the tunnels was analyzed to study the safety distance of tunnel-side goaf. The results show that with the increase of the distance between the goaf and the tunnel, the displacement of the main characteristic position of the tunnel decreases to different extents and finally tends to go to the condition of no goaf; Surrounding rocks between goafs are the most easily damaged areas; the safety distance of tunnel-side goafs is about 1.5 times of the tunnel span.