Study On Supporting Technology For Foundation Pit In Lakeside Soft Ground

At present,the popularization and promotion of high rise buildings at home and abroad,the use of external space has been limited,consider increasing the expansion of the underground area.The geological conditions of rock soil are responsible,how would a structure implemented,the design intent is fully displayed,in front of the problem is how to ensure the city underground space in rock and soil under the complicated geological environment safety and reasonable use.Geotechnical engineering problems in urgent need to solve in the process of city development,the city is first involved in the underground garage of the building,in the process of how to ensure the stability of foundation pit supporting structure is the key of foundation engineering,it is also the key to the construction of intention.The research background is supporting the construction project of Huzhou Binhu square foundation pit excavation of Zhejiang,mainly in the soft soil foundation rocks soil excavation of the foundation pit project,combined with the existence of special environment and complex geological condition of soft soil,which take a reasonable scheme to solve the problem of foundation pit and to ensure the successful completion of the implementation the task of the project.This paper firstly introduces some cases of soft ground treatment at home and the advanced support measures,and draws lessons from successful experience for the successful completion of the project laid the foundation.Secondly,the project area surrounding environment and the particularity of the Lizheng foundation software model parameters,and all kinds of conditions of different design calculation section,to ensure safety of foundation pit engineering.The general idea of this paper: an overview of the domestic geological conditions of rock and soil,in view of which one kind of geological conditions to take the support measures.The geotechnical conditions of the project in Binhu,and its particularity,are determined.To calculate the reliability and necessity of the software validation plan.The implementation of the project plan,the measures taken by the process control.Establishment and operation of monitoring system.Draw the technical innovation and mature experience.The project in the comprehensive analysis of the status of construction site environmental and geotechnical conditions,comprehensive consideration of schedule and construction safety,the pile supporting structure of steel reinforced cement(also known as SMW(Soil Mixing Wall)method)scheme.Sub regional design of retaining structure system.The main structure of a single row of three axis cement mixing pile up to 650@450(interpolation type steel)with a steel supporting foundation pit construction,West Road location for construction requirements added with a row of up to 600@1000 bored piles in row.Pile up to 650@450 and three axis cement waterproof curtain.4 meters below the bottom of the pit using three shaft cement mixing pile reinforcement,pit pit using 1:3 put slope excavation construction technology and construction program.Construction organization design considering the characteristics of soft soil characteristics of the project,the excavation of the foundation pit using the layered,sub region,top-down,step excavation.The foundation pit excavation and strictly follow the partition,partition,symmetry and balance "principle,to ensure the support structure first after last dig,dig to support the bottom elevation,timely supporting,reduce excavation without support during the exposure time,ensure the safety of construction.Through the successful implementation of the project,made the lake,near the road,the structure of the soft foundation treatment experience and construction control program,has accumulated rich experience in theory and data checking case for similar projects in the future.At the same time,the survey,design,construction,monitoring,as a whole,the innovation of a set of advanced construction experience and methods.For the riverside,Binhu soft soil foundation pit excavation,and accumulated valuable experience.