Research On Stability Against Overturning And Slope Of Portal Water Injection Sheet Pile

The main work of this dissertation is to analyze the stability against overturning and slope of the portal water injection sheet pile..Firstly, the two-dimensional nonlinear plane-strain FEM analysis, based on the theory of the double-row piles, which emphasizes the pile-soil interaction, is developed for the portal water injection sheet piles with the finite element analysis software ANSYS. The earth satisfies the elastic and plastic nonlinear characteristics of DRUCKER-PRAGER, and the pile follows the linear and the elastic characteristics. And also, the earth pressure formulate of the finite space is obtained with the result of the FEM. Further more, the stability against overturning of the portal water injection sheet pile is analyzed. The result shows that the bigger the cohesion and the friction angle, the batter the stability against overturning of the structure. Another result is that the stability reaches the best when the space between the two piles is in the 1/3-2/3 of the excavating highest.Secondly, the integral formulate is obtained of the stability of slopes of portal water injection sheet pile, which perfects the limit equation theory. The method in this dissertation is verified to be feasibility when its result is compared with that of the software GEO-slope. Meanwhile, the analysis of slopes stability is developed to the portal water injection sheet pile. It shows in the result that the cohesion and friction angle have much influence on the stability of slopes of the structure. And the result also shows that increasing the embedded depth will improve the stability of slopes of the portal water injection sheet pile more than increasing the space between the two piles.