An Utility Analysis Of The Combined Actions Of Soil Anchors And Earth-retaining Pile Wall For Real Projects

Based on the security, economics, and the practicability, this paper analysis the advantages and disadvantages of different kind foundation ditch shoring. The traditional methods to calculate the shoring inner force and the action mechanics, and some specifies in code for design of building foundation have been considered. According to the combined actions of soil anchors and earth-retaining pile wall, and the p~s curves get from field engineering tests, it put forth the method which is easy to calculate the inner force and horizontal displacement, so as easy to use in real project.When using the method above, the linearity and nonlinear relationships of the p~s curves are considered successively. According to the compatibility of deformation relationship of the crossing point of soil anchors and earth-retaining pile wall, nonlinear equations are listed, and then worked out through the program written. Lots of practical cases are provided, and the calculate result is compared to the data measured from the real projects.As it has a process in the excavation of the foundation ditch and the soil anchors hammer in, the construction steps are considered. To the each step, nonlinear equations are proposed according to the compatibility of deformation of the intersection point between soil anchors and earth-retaining pile wall. Multinomial fitting of p-s curve is figured out with the method of the least squares, and then the nonlinear regression function is gained. Put it into the nonlinear equations and solve it through fixed-point iterative program. The force and displacement of the every construction step can be obtained. Summation the displacement of the every construction step can get the eventually displacement. A case is provided as well.In the end, the problem of optimum design is discussed, where the spacing interval of the soil anchors are taken as variables, the maximum horizontal displacement of the earth-retaining pile wall is taken as the constraint condition, and the minimum stiffness of the earth-retaining pile wall or the minimum cost of the project is taken as objective function. The real instance proves out that the optimum design can reduce the project costs assuredly.