砂土的形变能破坏准则

本文基于国内外有关中主应力对砂土抗剪强度影响的模型，讨论了中主应力对砂土抗剪强度的影响机理，导出了以形变能破坏准则为基础，适用于复杂应力条件的强度指标计算公式，较好地考虑了砂性土在三轴压缩与三轴拉伸条件下强度指标的差异和中主应力对强度指标的放大效应。本文公式在考虑粘结应力的情况下，也可推广到对粘性土强度变化的研究。

Criterion for the Destructiveness of Sand Deformation Energy

It is emphasized in this peper the influential mechanism of the inter-principel stress in sandshear intensity on the basis of that model at home and abroad. Thus guidance given to the criterion forthe deformation destructiveness as the base, practically makes the intensity index operation formula applied to the complex stress conditions possible. Better consideration has been taken into the index difference of sand in the case of triaxial compression and triaxial extension as well as the modifying effectof the inter-principal stress on that index. The formula proposed here can also be applied to the researchon strength change of the clay viscidity in the thought of stickness stress.