软黏土侧压力系数K0阶段性特征研究

沿海软黏土的侧压力系数K0具有阶段性特征:当试验荷载P＜Pc'(土样的残余结构强度)时,K0值较小,试样的结构性好,呈现出似刚性的材料特征,侧压力系数小;当P＞Pc'时,K0值增大,土的微结构破坏,呈现出弹塑性体的材料特征,侧压力系数增大.而在工程实践中,受成孔、取土等诸多因素干扰,欠固结-正常固结的软黏性土的微结构的结构性易被破坏,使K0指标的阶段性特征不明显.

Research on staged characteristics of lateral pressure coeffcient K0 of soft clay

It is improved that there is staged characteristics of lateral pressure coefficient K0 of soft clay. When the test load P is less than sample’s remaining structure strength , the value of is small, and when , the value of K0 is increased. It’s the reflection of the staged characteristics of soft clay’s mechanical property. When , the structure of soil sample is undamaged, the sample is similar to a rigid material, the value is small; When , soils microstructure is damaged, the sample is changed to be elastoplastic material, the value is increased. In geotechnical practices, the sample is disturbed during drilling and sampling, the microstructure of under-consolidated or normal-consolidated soft clay is destroyed, the staged characteristics of index is disappear.