Study On The Support Technology Of Grouting Pile In Soft Soil Area With Horizontal Rotary Soil

In the southeast coastal area of our country,with the rapid development of city construction,high-rise buildings and high-rise buildings continue to emerge,the need for structure and function,generally have one to three basement,coastal areas are mostly weak soil,the geological structure is generally 1 meters thick surface soil or miscellaneous fill the surface soil,clay below 1 ～ 2 meters thick,clay under several meters thick silt or silt soil.The coastal areas especially coastal areas generally poor soil,the foundation pit depth of 5 meters above all adopt the bored pile + inner bracing support structure,the foundation pit structure safety is good,but the shortcomings are as follows: a large amount of concrete material support,and the establishment of pile,lattice column supporting high cost because of the support effect;mechanical excavation speed;support chiseling a larger workload,and affect the surrounding environment to support dismantlement;large area excavation,support the implementation of a certain degree of difficulty.Therefore,in recent years,due to the actual need of work,I have consciousness in the work of the summary of bored pile anchor retaining structure and soil retaining and supporting structure construction experience,knowledge of the use of postgraduate study pile in soft soil area with horizontal jet grouting anchor composite foundation pit supporting technology,aims to change the traditional supporting structure,developed a suitable for soft soil area of steel strand and soil cement composite soil anchor structure model of large pullout force of horizontal jet grouting anchor,instead of support,the horizontal jet anchor can be applied through the pretreatment on steel strand stress control,supporting effective deformation of supporting structure the value of this kind of supporting structure,convenient construction,low cost,high safety and to carry out the order after excavation.This kind of foundation pit supporting structure makes full use of the advantages of cast-in-place piles,such as large horizontal stiffness and long length,which can be controlled by calculation and horizontal pullout anchor and has small deformation.It is very suitable for deep foundation pit support in the thick coastal area.This paper first analyzes the research status of bored pile and horizontal rotary soil anchor composite foundation pit supporting technology,and points out the existing problems in the application of bored pile and horizontal rotary earth anchor composite foundation pit support technology in coastal area.In view of this technology,there is no mature design theory and construction technology parameter at present.The main contents and methods of this research and the significance of research are put forward.Then,how to select the application of the pilot project,and to put forward the calculation theory and the construction process parameters of the support structure.Then,through the test of supporting structure load test and the deformation detection of supporting structure,the safety of supporting structure is checked.It is proved that the calculation method theory of the support structure is reliable,and the construction process parameters are economical and practical.At last,the social and economic benefits of the technology are summarized and analyzed,which can be used as a reference for the application of this technology in the soft soil area.