Study On Design Optimization Of Slope Anti-slide Pile Based On Three Dimensional Finite Element Method

Anti-slide piles due to construction safety,simple and quick,anti-sliding ability,obvious effects and will not deteriorate further landslide environment and can effectively verify the geological conditions and timely adjust to design scheme,etc.,have been widely used in landslide treatment.In order to reveal the mutual coordination process beteen anti-slide pile,sliding body and sliding bed and get a reasonable safety factor of anti-slide pile-slope system stability,in this paper,the optimization of the design of the sliding pile is studied,and the improved finite element method combined with the finite element strength reduction method is adopted,a combination of the two methods is proposed to obtain the safety factor of the slope,combined with the example of slope,and the following research is carried out on the basis of the focus of the anti-slide pile-slope system:(1)First,using the finite element strength reduction,the upper and lower bounds of the safety factor of the slope is obtained,the safety factor of the plastic zone through the slope is used as the lower limit value,the safety factor of the nodel displacement multation rate is used as the upper limit value,then using the average of safety factor as the trial calculation of the improved finite element method of gravity increase method calculated by the model,judge whether the plastic zone of the slope is penetrating through the improved finite element method of gravity increase method,further precisely determine the value of the safety factor.(2)In an infinite homogeneous soil slope as the research object,the anti-slide pile model of single half pile,single pile,double half pile,a single pile and single half pile is established,to study the influence of the model size on the safety factor of the slope.The influence of the lateral position of the pile,the pile spacing,the ratio of the pile diameter and the length of the pile on the safety factor of the slope is discussed.Through the analysis of internal force,displacement and soil pressure of anti-slide pile,the optimal the reinforcement position of the pile,pile spacing,pile diameter and pile length are selected.(3)Through two pile layout form of double row piles(routine double row piles and double dislocation pile)comparative study,it is concluded that the double dislocation pile reinforcement effect is better,the optimized double row pile spacing,pile spacing and pile length.(4)Through the setting of different pile types of cross section(round,square,rectangular,T-shaped,Y-shaped and "Di" type)and pile arrangement calculated slope safety coefficient of different types of pile section,are calculated in the reduction factor of 1.3 and 1.4,the internal force response of the pile,and analysis of different pile type of cross section of pile of tensile and compressive stress and select the corresponding optimal of the arrangement of pile.(5)When the anti sliding pile spacing within a certain range,the pile of soil arching effect,in a certain extent reflect pile mechanism and the reinforcement effect,the different types of pile section pile of soil arching effect,different pile spacing and pile depths of soil arching effect are analysed,in the form of displacement of the arch distribution and stress arch distribution.