Research on Deformation Characteristics and Control Technology of Construction Structure of Expansive Soil Subway Ultra-Deep Foundation Pit
Due to the strong soil expansion and high groundwater level in expansive soil areas,structural deformation problems become more prominent during subway foundation pit construction,seriously affecting construction safety and engineering quality.Therefore,in combination with a subway ultra deep foundation pit project in an expansive soil layer in Chengdu,a method combining numerical simulation and on-site measurement was used to analyze the horizontal displacement changes of the retaining pile body in the ultra-deep foundation pit construction.The horizontal displacement changes of the retaining pile under different construction parameters were explored,and corresponding deformation control techniques were proposed.The results showed that the retaining pile generated a significant increase in horizontal displacement within a depth range of 14 meters,and the overall horizontal displacement curve of the pile body showed a"bow"shape with small ends and large middle.The diameter of the retaining pile is taken as 1.2 m,the embedded depth is taken as 3.5 m,and the deep foundation pit adopts the construction technology of closing from both ends to the middle.The retaining pile adopts the dry drilling method of rotary drilling to form holes,which can significantly reduce the horizontal displacement of the pile body,save costs,and improve engineering efficiency.
expansive soilultra-deep foundation pitretaining piledeformation control
NETL
NSTL
万方数据
