| Single row anti-slide pile structure is often used in the support of high and steep slope of loess,but the special properties of loess and boundary conditions and other factors do not affect the design and calculation method of anti-slide pile.Triangular distributed load,"m method" and other algorithms for calculating soil resistance before pile are still the mainstream method for the design and calculation of single row anti-slide pile of loess slope.It is not known whether these methods are suitable for all kinds of loess slopes.Therefore,this paper studies the distribution forms of landslide thrust behind the pile and soil resistance in front of the single row anti-slide pile with two embedding methods in the high and steep slope of the loess.The main research contents are as follows:(1)Design the scene of the two kinds of the single pile and scale model test series test,it is concluded that each trial pile top displacement,stress and bending moment acting on the pile,etc.,the change rule of certain groups of test of each failure mode of the model pile for multipoint cracking model pile,with geometrical methods to analyze the crack point position for the first time,and more pile test pile top displacement increment in each model,the stress analysis of the single pile and the force in the process of distribution and transfer process.Comparative test the model pile top horizontal displacement and horizontal displacement relationship model of the landslide mass and divided according to the model of anti-slide pile stress stage,among them,the first phase of anti-slide pile is not start-up phase,the second phase of anti-slide pile deformation stage effectively,the third stage for anti-slide pile failure stage,the three stages of start two cut-off point is defined as the critical load and critical slip resistance load.(2)Taking the displacement results of the field scale model test of three half-slope singlerow piles as the load applied value,model and analyze each group of field model tests one by one in ABAQUS,and assist in analyzing the law of stress and deformation of the whole pile section in each group of tests,and obtain the soil thrust and soil resistance distribution curve of the model pile before the limit state.(3)According to the model pile stress stage division as a result,the comprehensive site scale model test of anti-slide pile lateral pressure distribution and numerical simulation of antislide pile lateral pressure distribution,it is concluded that two kinds of anti-slide pile lateral pressure distribution near the limit state of pile lateral pressure nonlinear distribution hypothesis is put forward,and the scope of their function and the resultant force point.(4)The two-dimensional numerical model was established to compare the thrust and resistance of the nonlinear distribution deduced with the calculation results of the current triangular distribution,and the applicability and feasibility of the thrust and resistance of the nonlinear distribution in the loess slope in northern shaanxi were verified based on the field model test results.(5)Anti-slide pile failure warning model was established based on the theoretical basis of the thrust behind the nonlinear pile,the horizontal displacement of the anti-slide pile roof as the basic parameter,and the stress state of pile concrete and internal reinforcement.The failure warning analysis of anti-slide piles in two slopes along the project is carried out. |
