Study on Influence of Tunnel Undercrossing Shallow Buried Soft Rock on Deformation of Existing Subgrade
Based on the excavation project of a pedestrian tunnel in a southeast city,this paper analyzes the effects of different rock and soil cohesion,elastic modulus,and internal friction angle on roadbed deformation under the same load conditions.The results show that the increase in cohesion of rock and soil layers has no significant effect on roadbed settlement.As the elastic modulus of rock and soil increases,the deformation and settlement of the roadbed decrease.The smaller the elastic modulus of rock and soil,the greater the settlement of the roadbed.As the internal friction angle of the rock and soil layers increases,the deformation and settlement of the roadbed decrease.The larger the internal friction angle of the rock and soil layers,the smaller the settlement of the roadbed;In tunnel excavation projects,if the elastic modulus and internal friction angle parameters are not large,it is recommended to increase the support strength of the tunnel to prevent deformation of the highway subgrade.
万方数据
维普
