Study On Deep Foundation Pit Supporting Design And Construction Method Of Jinan Weishier Road Civil Air Defense Complex

Due to the increasingly shortage of urban land and the congestion of ground traffic,in order to obtain a larger space the foundation pit depth will inceased when the construction engineering has an underground project.The engineering conditions around the deep foundation pit are becoming more and more complicated,how to reasonably design support scheme,correctly choose the construction technology,safely and reliably monitor the deformation of deep foundation pit is becoming a major problem under the complicated conditions of the city with the small and complicated construction conditions,and not affecting the surrounding environment.This paper reasonably designed deep foundation pit support scheme,correctly selected the construction technology,and analyzed the monitoring data to avoid the sedimentation of the ground and destroy the safety of the nearby buildings,because civil air defense complex deep foundation pit of Jinan wei 12 Road is adjacent to the commercial developed area,the school,and there are important pipelines underground.The home and abroad construction examples of urban deep foundation pit were reviewed,the schemes and characteristics of foundation pit in Jinan area under different engineering geological conditions were investigated.Based on the actual hydrology,geology and engineering environment,this paper studied how to design a reasonable support structure system.The deep foundation pit selected the put slope,single row support piles,prestressed anchorage piles in standard section,the composite soil nailing wall in the outer expansion section,and strengthenly support pit in the local special section.This support structure system ensured the safety of the deep foundation pit and surrounding buildings.According to the determined support design scheme,the paper studied how to choose the suitably construction technology,and proposed the solution method to the difficulties which may be encountered in the specific construction process.Furthermore,,the safety of the deep foundation pit was guaranteed through reasonably designed monitoring project.The rationality of the previous design scheme and construction technology were verified by the analysis of the monitoring data.This paper proposed the representative section complete calculation process of design scheme,the construction technology and requirements,and the monitoring scheme,according to the construction of civil air defense complex under complicated construction environment.This research can provide a certain practical value for similar deep foundation pit engineerings in the future.