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通过分析黄土震陷物理力学机制,将影响震陷的主导因素归纳为粘聚力与内摩擦角(土体强度特征)、孔隙比(土体沉降特征)和外部动荷载特性(能量输入特征)等3方面。在此基础上,推导了应用孔隙比描述震陷系数的定量关系;利用摩尔-库伦破坏准则,提出了考虑动应力和固结应力的应力比概念,用以刻画动载输入对土体结构强度的影响;结合室内动三轴试验数据,给出了孔隙比压缩量与应力比之间的定量统计关系。耦合以上分析结果,建立了基于物理力学机制的求算地震动作用下黄土残余应变(震陷系数)的数学估算模型。
By analyzing the physical and mechanical mechanism of loess seismic subsidence, the dominant factors affecting the subsidence are summarized as cohesive force and internal friction angle (soil strength characteristics), void ratio (soil subsidence characteristics) and external dynamic load characteristics (energy input characteristics) Other 3 aspects. On this basis, the quantitative relationship between porosity and seismicity factor is derived. Based on the Mohr-Coulomb failure criterion, the concept of stress ratio considering dynamic stress and consolidation stress is put forward to describe the effect of dynamic load on the structural strength of soil The quantitative statistical relationship between the compression ratio and the stress ratio of the void ratio is given based on the experimental triaxial test data. Coupled with the above analysis results, a mathematical model for calculating the residual strain (collapse coefficient) of loess under earthquake action is established based on the physical mechanics mechanism.