Highway Widening Project Cement Grout Injection Mixing Composite Foundation Deformation Behavior And Settlement Calculation Method

Widenning of highway on soft ground is a new challenge in the construction of highway and is a key problem that must be solved in China. The back-work differential settlement along the joint between the existing and new embankments is the crussial issue of highway rehabilitation & expansion. Based on the review of widening of highway, a comprehensive introduction is given to the problemsof widening on the soft foundation such as the calculating methods, the soft foundation treatment design,linking measures of new and embankments, the controlling criteria about the setlement of new embankmentand diferential setlement of the new and existing embankments.And introduced the post-construction setlement calculating formula of asection of a highway .The usually way to deal with soft soil is composite foundation method. The concept of the composite foundation is that setting some reinforcement body in or adding some hi-strength material in natural foundation. So the reinforcing area is consist by natural foundation and reinforcement body. The characters of composite foundation are that the reinforcing area is uneven; anisotropy, and the foundation will bear the loads with the reinforcement body under the loads.The paper has elaborated analysis on the performance and the influence factor of settlement of composite foundation of deep mixing piles, with the help of the calculation and analysis of pracitical projects and has proved that the composite foundation of deep mixing piles can satisfy the highway rehabilitation & expansion.The paper can apply finite element method in the research of co foundation.And, work out a program. The program can analyze the simulate the process of construction, and consider the three dimensional Biot concretion.