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为研究前伏承压溶洞对巷道开挖围岩稳定性的影响,基于1条前伏溶洞巷道工程实例,采用FLAC~(3D)软件研究分析了巷道围岩应力、变形、塑性区以及涌水量在不同溶洞充填物与水压条件下的变化特征。结果表明:溶洞内部的软弱充填物将导致巷道近接溶洞时,掘进面与溶洞之间的围岩产生明显应力集中现象,使得巷道掘进面位移呈突变式增长;当巷道前方存在充填溶洞时,巷道掘进面前方岩体的剪切滑移破裂现象会受到溶洞阻隔作用而变得不明显;巷道掘进面涌水量与溶洞水压则近似呈指数递增关系。
In order to study the influence of front subsurface pressure caverns on the surrounding rock stability of roadway excavation, based on the case study of a former volcanic cavern roadway, the stress, deformation, plastic zone and water inflow Variation characteristics under different cave filling and water pressure conditions. The results show that the weak filling inside the cave will lead to the obvious stress concentration phenomenon of the surrounding rock between the tunneling surface and the cave when the roadway is close to the cave. As a result, the displacement of the tunneling surface shows a sudden change. When there is filling cave in front of the roadway, The shear-slip fracture of the rock mass in front of the excavation face will be obstructed by the karst caves and become insignificant. The water inflow at the excavation face of the tunnel and the karst cave water pressure have an exponential increasing relationship.