Abstract:The method of calculating the geometric parameters of the three-dimensional passive failure elliptical cone of shallow tunnel face was improved through introducing the expression for the elliptical locus of the intersection between the cone and plane. The upper bound expression of the passive failure pressure on three-dimensional shallow tunnel face and the optimal upper bound solution of passive failure pressure were obtained based on the upper bound limit analysis and nonlinear failure criterion. Reliability of this method was verified by comparing with other results. The effect of non-linear shear strength parameters on pressure and failure modes was investigated. Besides,the figures of failure modes were drawn. The passive failure pressure changes basically linearly with the ground overload ?s and soil density ?,but changes nonlinearly with the nonlinear parameters m,dimensionless parameter c0/?t and critical pressure ratio C/D. The failure modes were found to depend significantly on the nonlinear parameters m,dimensionless parameter c0/?t and critical pressure ratio C/D,but the ground overload ?s had smaller effect on failure modes.
李得建,赵炼恒,杨 峰,程 肖. 非线性破坏准则下浅埋隧道掌子面三维被动稳定性能耗分析改进方法[J]. 岩石力学与工程学报, 2016, 35(04): 743-752.
LI Dejian,ZHAO Lianheng,YANG Feng,CHENG Xiao. Three-dimensional stability analysis of passive failure on shallow tunnel face based on the nonlinear failure criterion. , 2016, 35(04): 743-752.
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