【摘要】 沿下伏基岩面失稳是堆积体滑坡破坏主要模式之一,在土石混合体介质-接触面大型直剪试验成果基础上,发现土石混合体介质与接触面在剪切试验过程中表现出应变硬化和应变软化两种接触面力学性质,建立了能够描述上述两种接触面性质的表达式。基于一个简化的力学模型通过求系统极值的尖点突变理论推导了堆积体滑坡抗滑桩所受滑坡推力的计算公式,公式中考虑了上述描述应变硬化和应变软化两种接触面力学的表达式,利用该公式分析了其中的主要参数对抗滑桩所受推力大小及分布特征的影响。最后将推导公式应用到一个堆积层古滑坡实例中,对比分析表明该理论结果与现场实测结果具有较好的一致性。更多还原

【Abstract】 Talus always slides along the bedrock surface.On the basis of straight shear tests on earth-rock aggregate and bedrock,the sliding surface of talus slide is a combination of two media: strain-hardening and strain-softening.A shear stress-strain constitutive model for the strain-softening medium is described by the Weibull’s distribution law.A shear stress-strain constitutive model for the strain-hardening medium is described by the linear equation.Based on a simplified model for anti-sliding piles in talus slide,the formulas for calculating thrust on anti-sliding piles are derived by considering the above two shear stress-strain constitutive models.How the main parameters of the proposed formulas affect the distribution laws of talus slide thrust on anti-sliding pile is discussed.Finally,the rationality of the proposed formulas is demonstrated based on comparative analysis of the theoretical and the experimental results.更多还原