坑周土压力与土体变形关系的试验研究

用武汉地区具有代表性的粉质粘土,在等压固结条件下进行保持轴向应力1σ不变、卸载侧向应力3σ的排水试验,模拟基坑开挖过程中坑周土体的应力路径,探索应力-应变关系的变化规律.研究表明：侧向卸荷应力路径下,该土样轴向和侧向的应力-应变关系呈双曲线型,且轴向破坏应变大于侧向破坏应变;一般轴向切线变形模量大于其侧向切线变形模量值.

Experimental Researches on Soil Pressure and Deformation of Soil Arroundfoundation Pit

To study relation between soil pressure and deformation for supporting foundation pit,under isotropic consolidation and lateral unloading,vertical pressure σ1is stable,horizontal pressureσ3 is decreased,the draining triaxial shearing tests are carried to Wu Han disturbed silty clay by simulation of stress path,the law of stress-strain relation is discussed.The result shows the relation curve of stress-strain is hyperbolic under lateral unloading,vertical failure strain value is bigger than lateral value and vertical tangent slope is smaller than lateral value.