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以往,土力学中计算土体变形应用的是弹性理论,土被简化为直线变形体.在稳定性分析中应用的是塑性理论,土体的强度的发挥与变形无关.这些不妥当的假定沿用了很长的时间,一直到电子计算技术应用于土力学,人们才可根据试验获得的土的应力～应变关系来计算实际土体的应力和应变分布,从而判断土体各点所处的状态是弹性平衡,还是塑性平衡,这种判定需要一个量标～抗剪强度指标.土的强度的确定,是个复杂的问题.它不仅与应力条件和排水条件有关,而且与变形密切关联,过去,人们是应用一定的破坏准则从土体
In the past, the elasticity theory was used to calculate the soil deformation in soil mechanics, and the soil was simplified as a linear deformable body. The plasticity theory was applied in the stability analysis. The strength of the soil was not related to the deformation. These inappropriate assumptions are still in use. For a long time, until the electronic computing technology was applied to soil mechanics, people could calculate the stress and strain distribution of the actual soil according to the stress-strain relationship of the soil obtained from the test, and thus determine the state of each point of the soil. Whether it is elastic balance or plastic balance, this determination requires a measure of the strength of the target. The determination of the strength of soil is a complex issue. It is not only related to stress conditions and drainage conditions, but also closely related to deformation. In the past, People are applying some destructive criteria from the soil