应力释放对开挖工程稳定性的重要影响

IMPORTANT CONSEQUENCES OF STRESS RELEASE IN THE STABILITY OF EXCAVATIONS

开挖的长期稳定性是许多复杂因素相互作用的结果。根据理论分析和一些工程实录可以断言,起根本性作用的因素有三个,即:累积弹性能的释放;新产生的应力状态扩容;以及泥质材料的润滑和膨胀。本文提出了一些使这些因素的不利影响减所引起的渐进少到最低限度的措施。

In the longterm the stability of excavations is a result of interaction of many complex factors. On the basis of a theoretical analysis and some case records it has been concluded that three factors play a fundamental role: the release of accumulated elastic energy, the progressive dilataney due to the newly created state of stress and the lubrication and swelling of argillaceous matter. Some measures are suggested to keep their unfavourable effects at a minimum.