河北省非饱和土深基坑稳定性研究

为了研究河北省非饱和土深基坑的稳定性,首先采用三轴试验对不同含水量土样的抗剪强度参数进行了测定,探究土样含水量与抗剪强度参数的关系.然后,以河北省非饱和土基坑工程为例,对含水量不同的非饱和土深基坑边坡的稳定性进行了分析.研究结果表明:含水量变化对非饱和土的粘聚力有较大的影响,随着含水量的增加,土的抗剪强度参数降低,使得相同状态下基坑边坡的稳定安全系数呈现出明显的下降趋势.

Study on Stability of Deep Foundation Pit in Unsaturated Soil of Hebei Province

In order to study stability of deep foundation pit in unsaturated soil of Hebei Province,triaxial tests are accomplished to mensurate shear strength parameters for unsaturated soil of different water content first,and relationship of water content and shear strength parameters of unsaturated soil is analyzed. Then,stability of deep foundation pit in unsaturated soil of different water content is studied through one foundation pit example in unsaturated soil of Hebei Province. The study results indicate that water content change has great effect on cohesion of unsaturated soil. After water content is increased,shear strength parameters of unsaturated soil will reduce and safety factor of stability of deep foundation pit shows obvious downtrend in the same condition.