Study On The Double-Row Piles Of The Coastal Soft Land Area

Aiming at the Shenzhen coastal areas of the soil engineering characteristics were summarized, and briefly summarizes the application in Shenzhen in a wide range of several major foundation pit supporting structure type. Compared to other supporting structures, double-row pile support structure with large lateral stiffness, can effectively limit deformation of retaining structure. The depth of supporting is deeper. At the same time double-row pile have short time limit for a project, convenient construction, excellent stress condition and the overall stability, and also lower cost. It gradually becomes the priority considered form of the deep foundation pit for Shenzhen coastal soft soil area. This paper also summarizes the current development of computing theory as well as the advantages and disadvantages of the double-row piles computing theory.In this paper, A Shenzhen area of deep foundation pit engineering example is applied as the background, using ANSYS finite element software to construct a three dimensional numerical model. This paper analyzes the work condition of the double row pile support structure, and in the light of double row pile support structure under different row spacing, different pile diameter, different pile length and exclusion of soft soil reinforced between several cases separately carried on the numerical simulation and analysis. Then, It gets a series of valuable results. The main research content is as follows:First of all, this paper summarizes and analyzes many support row pile support structure of several calculation theories. For each kind of calculation theory explains the advantages and disadvantages.Secondly, according to the Shenzhen area a deep foundation pit double row pile supporting engineering examples as the background, using the general finite element software ANSYS as an example to establish numerical simulation analysis model. In the numerical model suitable for soft soil modified Cambridge model and suitable for other normal consolidation of soil D-P model were simulated silt and other soil constitutive relationship.Finally, the finite element set up double row pile numerical simulation analysis model, the simulation of actual foundation pit excavation construction process. Further analysis in change double row pile row spacing, pile diameter, pile length and pile between before and after strengthening soft soil conditions of pile body structure of the internal force (moment) and displacement difference and change rule.