考虑围岩空间变异性的浅埋隧道可靠度分析OA

In order to study the influence of spatial variability of surrounding rock parameters on the deformation and stability of shallow tunnel structure,taking the Chengdu-Chongqing Expressway underpass as the engineering background and based on the geotechnical random field theory and reliability method,the tunnel structure function considering the spatial variability of surrounding rock parameters is established,and the influence of variability and correlation of parameters such as elastic modulus,cohesion and internal friction angle on the reliability of tunnel vault settlement and surface settlement is analyzed.The results show that the influence of the variability of surrounding rock parameters on the reliability of tunnel structure is significantly greater than that of parameter correlation,and among them,cohesion has the greatest influence on the reliability of vault settlement,and internal friction angle has the most significant influence on the reliability of surface settlement.The research results can provide a theoretical basis for reliability design and risk assessment of tunnel engineering under similar geological conditions.