Abstract
The overlying rock mass under the tiankeng developes karst and thus has poor mechanical properties, which brings about great risks for the tunnel undercrossing construction. In order to determine the safety conditions of the tunnel and karst tiankeng during the undercrossing construction of the Jiguanshan Tunnel, a three-dimensional elastoplastic numerical model was established to analyze the deformation laws of the surrounding, deep and surface rock mass. The calculation results showed that the deformation of surrounding rock was dominated by settlement. With the longitudinal deformation of 57.3mm, the stability of the tunnel face was poor and the surrounding rock of the arch was prone to instability. The deformation of the surface tiankeng was slight. However, given that the uncertainty of karst development at the bottom of the karst tiankeng and the influence of tunnel construction blasting vibration, the surface rock was still at high risk of instability. The research results can provide references for the design of similar projects.
Published Version
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