Research And Application Of Pile-anchor Retaining Structure In Deep Foundation Pit

With the rapid development of national economy,the scale of engineering projects construction is growing.The requirements for foundation excavation depth and geological quality are getting higher and higher.During the excavation of deep foundation pits,deep foundation pits need to be supported to prevent the occurrence of danger.Among various supporting methods,pile-anchor retaining is widely used.In this paper,theoretical analysis and practical application research on the pile-anchor retaining structure of deep foundation pit are carried out by the combination of numerical simulation and actual engineering.Firstly,the types of support for deep foundation pits were summarized and analyzed,and the types of supporting in deep foundation pit were defined.The safety level of supporting structures was studied,and pile-anchor retaining structure in the deep foundation was analyzed.The damage form and damage process were summarized and analyzed.Secondly,the calculation theory of deep foundation pit was studied.The basic theory of earth pressure calculation and foundation pit deformation calculation were analyzed.The numerical simulation for foundation pit support was established.The basic assumptions of model establishment were clarified.At the same time,the unit life and death technology was introduced,the parameters used in the numerical simulation were determined,and the soil displacement under unsupported condition was calculated.Then the above numerical simulation method was used to study the influence of pile-anchor size on deep foundation pits,length and diameter of the support pile,and length and diameter of anchor were changed respectively.The variation of soil displacement was studied and the optimal selection of scheme was carried out.The size of the retaining pile-anchor when the soil deformation is minimum was obtainedFinally,based on the actual situation of deep foundation pit project in the third section of the integrated pipe gallery of the Industrial North Road of Jinan City,the application research of pile-anchor,foundation pit excavation and the inter-pile network construction in the actual project was carried out.Combined with the practical application of deep foundation pit-anchor support,the feasibility of theoretical research was proved.