Abstract

Info

Title:: Permanent Supporting Structure Combined with Supporting Piles and Underground Structure

Author(s):: LI Lian-xiang; LIU Bing; LI Xian-jun; Foundation Pit and Deep Foundation Engineering Research Center, Shandong University

Keywords:: foundation pit; pile-anchor retaining structure; permanent supporting structure; durability

Abstract:: In order to study the application value of foundation pit support piles under permanent working conditions, a permanent design was made for a pile-anchor retaining structure in Jinan. The permanent supporting structure system was formed by the connection of supporting piles and the underground structure through the supporting members, which resisted the lateral pressure of foundation pit. Finite element simulation software PLAXIS-3D was carried out for each working condition of the structure. The results show that the permanent supporting structure can effectively reduce the stress on the basement exterior wall. Most of the soil pressure is born by the supporting piles. The basement walls only burden earth lateral pressure produced by backfill soil, so its design just needs to meet the construction requirement. After changing the support, the bending moment of the piles and the ground settlement around foundation pit are largely increased, thus the supporting piles and surrounding are adversely affected and supporting piles design needs to meet higher requirements. Crack calculation results show that the permanent supporting structure meets the existing specifications for durability of concrete structure, and affords the foundation of the extension of permanent supporting structure.