Internal Force Analysis And Engineering Application Of H-type Anti-slide Pile

Landslide is a common geological disaster that occurs in mountainous areas and often poses a great threat to people’s lives and property.Anti-slide piles are the most commonly used control measures for prevention and control of side slopes,and are also research hotspots in the field of disaster prevention and control.For the slope with deep overburden or steep terrain,the traditional anti-slide pile can not meet the requirements of deformation and stability.After a lot of engineering practice,it is usually used to resist the sliding of the h-type combined with large thrust.pile.However,the internal force calculation method,the mechanism of the front and rear piles is not clear.Therefore,this paper studies the applicable conditions of the h-type anti-slide pile in the soil slope,and proposes the theoretical analysis method of the internal force calculation method of the h-type anti-slide pile.The numerical simulation analysis method is used to study the structural parameters optimization of h-type anti-slide piles.The main research contents and results are as follows:(1)The research on h-type anti-slide piles at home and abroad is summarized,and the research results in experiments,numerical simulations and theoretical results in recent years are sorted out.Combined with domestic engineering examples,the applicable conditions of h-type anti-slide piles are obtained by comparing the position of piles,piles and landslide thrust.(2)The h-type anti-slide pile is divided into the bearing section of the plane rigid frame and the anchoring section of the elastic foundation beam.The bearing section and the anchoring section are calculated by the structural mechanics method and the two-parameter method respectively.The internal force calculation formula of the positive and negative anti-slide piles is deduced,and the GUIDE interface is established by MATLAB software programming to realize the operation.(3)Using ANSYS workbench software to analyze the key parameters of h-type anti-slide pile,calculate the stress and deformation of h-type anti-slide pile under different cross-section shape,pile-laying method and pile spacing.The results show that the h-type anti-slide pile is suitable for the square section;the design should be based on the condition of the pile to select the pile form,the short pile should be selected in the sliding section,and the short pile should be set outside the anti-slip section;The row spacing of the positive anti-sliding piles can be 3B~5B(B is the pile width),and the row spacing of the anti-sliding piles can be 3B~4B,and should not be less than 5m.(4)Taking the high slope of Longshan Station on the Syrian Railway as an example,the ANSYS workbench software is used to simulate the support effect of the h-type anti-slide pile.The results show that the reverse pile of the high slope of Longshan Station and the pile spacing of 9 m are reasonable;Under the same condition,the displacement of the pile top of ordinary anti-slide pile is three times that of the pile top of h-type anti-slide pile.The h-type anti-slide pile can effectively reduce the stress and displacement of the slope and improve the stability of the slope.Contrast structure load method,stratum structure method and theoretical calculation results,the stratum structure method is applicable to the early stage of h-type anti-sliding design or when the support effect needs to be verified,the structural load method is applicable to the anti-slide pile check;the theoretical analysis shows that the anti-slide pile deformation law is consistent.However,the numerical value is large.Therefore,the theoretical analysis is only suitable for observing the deformation law of anti-slide piles.