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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。
The instability along the underlying bedrock is one of the main modes of landslide failure. Based on the large-scale direct shear test results of the medium-soil interface, it is found that the medium and the contact surface of the rock-soil mixture show in the shear test Strain hardening and strain softening of the two mechanical properties of the contact surface, the establishment of a description of the above two contact surface properties of the expression. Based on a simplified mechanics model, the formula for calculating the thrust of landslide subjected to anti-slide piles in landslide is deduced by the cusp catastrophe theory of extremum of system. The equations describe the mechanics of the interface between strain hardening and strain softening Using this formula, the influence of the main parameters on the thrust force and distribution characteristics of anti-slide piles is analyzed. Finally, the derivation formula is applied to an example of the accumulation of ancient landslides. The comparative analysis shows that the theoretical results are in good agreement with the field measurements.