Study On High Pressure Jet Grouting Anchor Rod Stress Mechanism

In recent years,there is a high accident rate of foundation pit.Especially foundation pit supporting in the soft soil area is the focus of engineering.High pressure jet grouting anchor can better solve the problem of foundation pit supporting of soft soil area,this paper aimed to study advantages and working mechanism of high pressure jet grouting anchor support in soft soil area.The main research contents are as follows:(1)Under the same case of foundation pit model,boundary conditions and the soil parameters.First of all to establish Ordinary bolt model,and then to establish the model of high pressure jet grouting anchor,and respectively analysis the different anchorage length of two models,its influence on displacement of foundation pit.Comparing with the same length influence on displacement of foundation of two kinds of anchor.(2)Under the same case of foundation pit model,boundary conditions and the soil parameters.First of all to establish Ordinary bolt model,and then to establish the model of high pressure jet grouting anchor,applying different prestress to the same length of two kinds of anchor,to analyze the influence of different prestressing effect on foundation pit supporting under two kinds of model,in the same prestressed and anchor length,two types of anchor supporting effect.(3)By means of high pressure jet grouting anchor and ordinary anchor cable tension test,contrast the ultimate pull-out force and the displacement of the anchor head(4)By monitoring data of horizontal displacement of pile top is in the process of excavation,Study the supporting effect of high pressure spray anchor and ordinary bolt.