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临界填土高度是软土路堤沉降和稳定控制的重要指标,首先推导3种真三轴强度准则即广义M-N准则、广义L-D准则和统一强度理论的平面应变统一表达式,进而合理考虑中间主应力影响和土体实际侧压力系数,建立地基临界荷载与路堤临界填土高度的统一解,给出公式适用条件并进行验证,最后探讨路堤临界填土高度的强度理论效应,并得出土体黏聚力和内摩擦角对路堤临界填土高度的影响规律。研究结果表明:提出的统一解具有很好的可比性,且其强度理论效应即中间主应力效应明显;M-C准则的结果过于保守,应优先选用广义M-N准则、广义L-D准则或参数b=1/2时统一强度理论;侧压力系数、黏聚力及内摩擦角对路堤临界填土高度的影响均很显著,应原位测试确定地基土的真实侧压力系数,并充分考虑土体抗剪强度参数的变异性。
Critical height of embankment is an important index for settlement and stability control of soft soil embankment. First, three kinds of true triaxial strength criterion, generalized MN criterion, generalized LD criterion and uniform strength theory, are derived, and then the intermediate principal stress Influence and the actual lateral pressure coefficient of soil, establish the unified solution to the critical load of embankment and the critical height of the embankment, give the applicable conditions of the formula and verify, finally discuss the theoretical effect of embankment critical height of the embankment, Influence of Force and Internal Friction Angle on Embankment Critical Fill Height. The results show that the proposed unified solution has a good comparability, and the effect of the strength theory is that the effect of the intermediate principal stress is obvious. The result of the MC criterion is too conservative and the generalized MN criterion, the generalized LD criterion or the parameter b = 1 / The unified theory of strength at 2 o’clock; the influence of lateral pressure coefficient, cohesion and internal friction angle on the critical height of embankment are significant. The true lateral pressure coefficient of foundation soil should be determined by in situ testing, and fully consider the shear strength Variability of parameters.