strain path

Based on the test results of sand, mechanics of internal parameters ( plastic volumetric strain and plastic deviator strain) depending on stress path is explained. General equation expressing hardening parameter independent of stress path is proposed.

在分析砂土试验结果的基础上，揭示了基本硬化内参量（塑性体积应变、塑性剪应变）变化的应力路径相关性，提出了应力路径无关硬化参量的一般表达式。

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The thesis deals with the experimental study on the constitutive relationships of concrete under one kind of complex loading path that contains the feedback control of strain& proportional monotonic loading path with constant confining deformation under stress spherical tensor. The thesis includes five chapters as follows.

本文针对混凝土材料进行了一种加载路径中包含对应变反馈控制的复杂加载路径的试验研究&在球量荷载下，恒侧向变形路径单调比例加载的试验研究。

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But the fracture coalescence path is winding under static loading, which is different from dynamic loading. So, the inertia effect of the fracture propagation is regarded as the main cause of the strength increase of the brittle material under slow to medium strain rate.

这与静载下岩桥处的贯通常通过分支裂纹拐折扩展、相连不同，这也是导致裂隙试样中低应变速率下强度增大（即速率效应）的主要原因。

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Study on compacting space effect based on Strain Path Method

基于应变路径法的压桩挤土空间效应研究

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