Analysis and treatment for collapse accident of a foundation pit in deep and thick sullage soft-soil area
The drilled row-piles and reinforced concrete internal bracing system were used for supporting a foundation pit located in deep and thick sullage soft-soil area.The lattice mixing piles were used for strengthening the passive area of the foundation pit.The foundation pit collapsed when the local excavation reached the bottom of the foundation pit.The internal force and deformation of the supporting structure during the excavation process of the foundation pit were simulated.Combining with the performance of the collapse process,the collapse accident of the foundation pit was analyzed,and the strengthening scheme of the foundation pit was proposed.In the strengthening scheme of the foundation pit,the undamaged members in the supporting structure of the foundation pit were fully utilized,and the supporting structure in the collapsed area was re-constructed,and the members with insufficient bearing capacity were strengthened.Using the time-space effect of soil and information management of the construction process,the skip excavation construction was conducted on the backfill reverse pressure platform around the foundation pit.The monitoring datas after strengthening of the foundation pit show that the deformation of the supporting structure meets the design requirements.
soft-soil areasupport of foundation pitinternal bracingfoundation pit collapseaccident analysisfoundation pit reinforcementinformatization constructionfoundation pit monitoring
NETL
NSTL
万方数据
