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隧道围岩偏压性通常认为体现在地形上,而工程上对地应力、水压力、溶腔与采空区等造成围岩的偏压效应重视不足。该文以罗依溪隧道为例,采用有限差分法软件FLAC3D数值方法,计算存在侧部溶腔的隧道围岩的位移场及应力场。结果表明:侧部溶腔可对隧道围岩稳定性产生较大的影响,表现出一定的偏压效应。根据岩溶隧道偏压效应,采用排水隔水、弃碴回填溶腔、横衬施作、小导管注浆及喷锚支护综合治理方法,并在处治中加强监测及信息反馈,做到岩溶隧道工程的动态设计与信息化处治相结合。
Bias pressure of tunnel surrounding rock is generally considered to be reflected in the terrain. However, the bias effect of surrounding rock caused by ground stress, water pressure, dissolving cavity and goaf is neglected in engineering. In this paper, LuoYiXi tunnel is taken as an example, the displacement field and the stress field of tunnel surrounding rock with lateral dissolution cavity are calculated by finite difference method software FLAC3D numerical method. The results show that the side cavern can have a great influence on the stability of the surrounding rock of the tunnel and show a certain biasing effect. According to the biasing effect of karst tunnels, the method of drainage and water separation, ballast backfilling and dissolving cavities, lateral lining, small conduit grouting and shotcrete and bolt supporting comprehensive treatment are adopted, and the monitoring and information feedback are strengthened during the treatment so that the karst tunnel Engineering dynamic design and information processing combined.