The strain criterion for ductile shear failure based on the maximum principal shear strain is established.
据此，建立基于最大主剪应变的岩土材料延性剪切破坏应变准则；
An equation for the calculation of true shear strain was derived from the integration of infinitesimal shear strain in plane shearing process with constant principal shear strain direction.
对切应变主轴不变的平面简单切变过程，通过无穷小应变的积分，导出了真实切应变计算公式。
The study results show that generalized shear stress has a strong nonlinear relation with generalized shear strain, and intermediate principal stress has interval effect on soil strength.
研究表明：土体广义剪应力与广义剪应变关系曲线呈明显的非线性，中主应力对土体强度的影响存在区间效应。
When the dry density is relatively high, this dense specimen shows shear dilatation characteristics, and the effective principal stress ratio tends to be strain softening phenomenon.
干密度值较高时，土样处于密实状态，表现出剪胀特性，有效主应力比-应变曲线近于应变软化型；
The area with the simultaneous higher surface strain, principal compressive strain, shear strain and tendency accumulation might be the place with higher risk of strong earthquakes.
面应变、主压应变、剪应变和趋势累积率同时较高的地区，强震危险性较大。
The area with the simultaneous higher surface strain, principal compressive strain, shear strain and tendency accumulation might be the place with higher risk of strong earthquakes.
面应变、主压应变、剪应变和趋势累积率同时较高的地区，强震危险性较大。
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