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采用JCY型K0固结仪,对不同密实度的砂土、饱和粉土和饱和粉质黏土进行K0加卸载试验,采用K0加卸载模型对土体加卸载过程中的水平应力σ′h和竖向应力σ′v的关系进行描述,结合土体物理力学特性对K0加卸载模型参数进行探讨。试验结果表明:对于黏性土和非黏性土,土体加载过程中σ′v-σ′h关系为线性,卸载过程中σ′v-σ′h关系为非线性;土体竖向应力σ′v卸荷至零时,土体中的残余水平应力σ′h与土体黏性相关,采用土体的K0加卸载模型可对土体K0加卸载过程中的σ′v-σ′h关系进行良好的描述;土体的K0加卸载模型参数K0(NC)和α与其内摩擦角φ′相关。
The JC0 K0 consolidation instrument was used to test the K0 loading and unloading tests on sandy soil, saturated silt and saturated silty clay with different densities. The horizontal stress σ’h and vertical The relationship between stress σ’v and soil physical and mechanical properties of K0 plus unloading model parameters are discussed. The experimental results show that the relationship between σ’v-σ’h and the non-cohesive soil is linear and σ’v-σ’h is nonlinear. The vertical stress of soil σ’v unloading to zero, soil residual stress level σ’h and soil viscosity related to the use of soil K0 plus unloading model of soil K0 during loading and unloading process σ’v-σ ’ h relationship; K0 (NC) and α of soil K0 plus unloading model are related to their internal friction angle φ ’.