卸载对软土伸长强度的影响分析

Soft Soil Extension Strength Analysis under Unloading Conditions

摘要:基于Hvorslev强度理论,以卸荷前应力状态为基准,推导了软土等向卸载后,土体处于类似超压密状态时卸载土体强度与卸载前正常固结土强度之间的关系式;采用太沙基—维固结理论,编制了内嵌固结计算的修正剑桥模型程序,分析不同卸载量、不同卸载固结时间、不同卸载级数对强度的影响。从而提供了全面系统分析卸载对软土伸长强度影响的方法。计算结果与试验数据对比,表明分析方法具有较好的可信度。

In order to analyze the soft soil extension strength under unloading conditions, Hvorslev soil strength theory and Terzaghi one - dimensional consolidation theory are adopted. Based on 'Hvorslev soil strength theory,the strength relation between normal consolidated soil and the respective over - consolidated soil is given in isotropic unloading state. By the program of embedded consolidation calculation and modified Cam-clay model,the soft soil strength in different unloading stresses,unloading time and unloading progression can be analyzed. Therefore, a rounded analysis method of soft soil strength under unloading conditions is given in this paper. The comparison of computer and labor result show that the analysis method is reliable.