Excavation deformation characteristics and optimization design of deep and large foundation pit in complex strata
The excavation of foundation pit in complex strata will have a great disturbance and impact on the surrounding environment.Taking the foundation pit of Lanshi 14#plot construction project in Lanzhou City as the engineering background,the numerical simulation of foundation pit excavation was carried out by using finite element software MIDAS,the research and analysis were carried out in combination with on-site monitoring data.The results show that the maximum horizontal displacement of the pile body is 13.5mm and the maximum vertical displacement around the foundation pit is 12.1mm during the excavation of the foundation pit,the force of the pile body and bolt is proportional to the excavation depth of the foundation pit and meets the requirements of the specification.At the same time,the optimization analysis of the original foundation pit design scheme was carried out,the influencing factors such as different sloping rates and different pile diameters were compared.The results show that when adopting support pile with the 600mm pile diameter,pile spacing of 1.2m and sloping rate of 1∶0.5,the deformation of the foundation pit is generally consistent with the original design,and the optimized excavation support scheme could effectively reduce the excavation support cost of the foundation pit.
complex stratadeep and large foundation pitnumerical simulationdeformation of foundation pitoptimized design
NETL
NSTL
万方数据
