摘要
通过分析浸水过程中挤土应力、体应变的变化规律得出:浸水造成挤土应力进一步衰减,但浸水造成的应力衰减幅值不大;在应力-应变塑性区的压缩体应变大于弹性区的体应变值,且浅部塑性区土体有湿陷的可能。对浸水前、后黄土力学参数的对比表明:经过沉桩后,挤土和浸水作用,使黄土的弹性模量增大,极限强度降低,而抗剪强度参数与受到的挤土应力水平相关。基于考虑浸水软化的屈服面概念,说明在应变保持和浸水阶段塑性区土体处于剪切蠕变状态,即处于从天然状态的屈服面过渡到饱和状态的屈服面的过程。
By analyzing the variation of soil compaction stress and volume strain during water immersion, a conclusion was reached that water immersion caused compaction stress attenuation, but the amplitude was not obvious; the volume strain in plastic zone was larger than in elastic zone, and the loess might produce collapse in shallow plastic zone. Comparative tests before and after immersion showed that the elastic modulus of loess was increased, the ultimate strength was reduced, and the shear strength indices were related to the stress level of the soil. The yield surface considering moisture content could explain that the loess in plastic zone during water immersion was in shearing creep state.
出处
《工业建筑》
CSCD
北大核心
2016年第5期114-118,共5页
Industrial Construction
基金
河南省高校科技创新团队支持计划(14IRTSTHN029)
河南省教育厅自然科学研究计划项目(2010A560013
2011B560012)
关键词
浸水
挤土应力
湿陷
抗剪强度
屈服面
water immersion
compaction stress
collapse
shear strength
yield surface
