| Reinforced jet- grouting anchor pile is a new form of foundation pit supporting which with fast construction speed, simple methods, little influence on environment, economic efficiency. Technology makes strength parameters and bearing capacity of the soil improved, which is very suitable to put into use in Binjiang soft soil area. However, there are obvious shortcomings of the characteristics of load transfer mechanism and prediction of ultimate uplift bearing capacity and evaluation of design parameters. In order to make it more reasonable and secure apply the technology of reinforced jet-grouting anchor pile to the support of foundation pit in Binjiang soft soil area, so study on the bearing mechanism and design methods of reinforced jet-grouting anchor pile necessary contucted.The main works of this paper are summarized as follows:First of all,this paper analysis the basic mathematical features of traditional P-S curve and the existing defects. Then it deduces a new three parameter model, which overcome disadvantages of traditional model and simulate the t rend of P-S curve, proves the possibility of the model depending on the practical engineering.Secondly,this paper researches on the effect of retaining for soft-earth foundation pit in Binjiang by 2D and 3D numerical simulation. Then it analyzes the characteristics of its stress mechanism, and gets the change rule of uplift and axial force of reinforced jet-grouting anchor pile. Meanwhile, it adopts the numerical simulation to study on the P-S curve of rein- forced jet-grouting anchor pile which proves the accuracy of three parameter model by comparing the result of simulation with three parameter model.Thirdly, through the numerical simulation of reinforced jet- grouting anchor pile, this paper studies on the features of reinforced jet- grouting anchor pile stress mechanism under different pile spacing, pile length, incidence angle and the reasonable range of design parameters for reinforced jet-grouting anchor pile. |
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