冻土破坏过程的微裂纹损伤区的计算分析

Calculation of micro-crack damage zone for frozen soil

对冻土破坏过程进行了试验研究,冻土破坏的过程是微裂纹损伤与临界串接的演化过程,确认了冻土微裂纹损伤区的存在,并分别用莫尔准则和最大拉应力准则建立了微裂纹损伤区计算模式。将微裂纹损伤区按缺陷处理并简化为当量裂纹,进行了裂纹尺寸的定量计算,结果表明其尺寸与冻土中初始裂纹尺寸相当,将计算结果与观测结果相比较,误差不超过10%。

This paper presents experimental evidence confirming the existence of a damage zone in frozen soil, which is caused by propagation and connection of micro|cracks resulting in failure. The sizes of damage zones are evaluated via Mohr's and Maximum|Normal|Stress criterions, and the micro|crack damage zones are dealt with as equivalent cracks. Computing results show that equivalent cracks are basically the same as initial cracks in term of size, and the difference between computing and experimental result is within 10%.