本文主要研究隧道盾构掘进施工中周围受扰动土体应力状态和应变状态的变异，以及由土体应力状态和应变状态的改变引起土体力学性质变异的特性。
The variation of stress state and strain state induced by tunnel shield driving in soils is studied, and the variation of soil mechanical properties is studied too in this paper.
由于一般构件的几何形状和荷载状态复杂，难于对裂纹尖端的应力应变状态得到理论解。
Because of complexity of geometric shape and loading state for general component, it is difficult to gain theoretical solution to the state of stress-strain for cracking tip.
由于一般构件的几何形状和荷载状态复杂，难于对裂纹尖端的应力应变状态得到理论解。
Because of complexity of geometric shape and loading state for general component, it is difficult to gain theoretical solution to the state of stress-strain for cracking tip.
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