Study on mechanical response mechanism of ring supporting structure of expansive soil deep foundation pit under different water contents
Expansive soil is widely distributed in Chengdu area,and its mechanical properties have significant water sensitivity,which brings great challenges to foundation pit and other construction projects.The mechanical response of foundation pit support structure to the properties of expansive soil under different water contents is the key to the design of support engineering.Taking the deep foundation pit of ring supporting system in Chengdu expansive soil area as the research object,the triaxial consolidated undrained shear test of expansive soil under the influence of different water contents was carried out,and the numerical model of the mechanical response of the ring supporting structure of deep foundation pit under the influence of different water contents was established.The results show that the shear strength parameters of silty clay and hard-plastic clay decrease with the increase of water content,and the shear strength parameters of hard-plastic clay have higher water sensitivity.In the ring supporting system,the horizontal displacements of the pile top and the pile body increase with the increase of the water content,and the maximum horizontal displacement of the pile body is at a depth of about 13.0 m.The settlement deformation of adjacent foundation pit buildings increases with the increase of excavation depth and water content.When the water content increases,the adjacent foundation pit buildings are prone to uneven settlement,especially when the water content increases greatly,the adjacent foundation pit buildings are prone to overall settlement.
Chengdu expansive soildeep foundation pitring supporting structuremechanical response
万方数据
维普
