Study On Invalid Embedding Depth And Engineering Application Of Rock-socketed Anti-slide Pile On Steep Slope

With the growing national economy,the construction of engineering projects has entered a stage of large-scale development.Because China is dominated by mountainous terrain,the complex and changeable topography determines that it is inevitable to face a large number of landslide problems when carrying out construction of water conservancy,railways,highways and other projects.Anti-sliding piles,as a kind of supporting and reinforcing anti-sliding structure,have the advantages of convenient construction and strong economy,and are widely used in slope protection and foundation pit support.When selecting the location of anti-slide piles,for economic and safety reasons,anti-slide piles are usually arranged on a smooth sliding surface.However,due to the limitation of terrain and engineering conditions,many anti-sliding piles must be arranged on steep slope foundations.As a result,the rock mass in front of the piles cannot provide sufficient effective resistance and cannot achieve the expected anchoring effect.Therefore,the research on the wedge fracture angle and invalid embedding depth of the rock-slide anti-slide piles on steep slopes is of great engineering significance to guide the design and construction of anti-slide piles on steep slopes.In view of the current research and analysis on steep slopes and rock-slide anti-slide piles,there is no complete design and calculation theory of rock-slide anti-slide piles.Based on the existing research,this article focuses on the The wedge fracture angle and ineffective embedding depth were analyzed and studied.The main research work and results of this article are as follows:(1)Limit equilibrium analysis is performed on the wedge before the pile,the equilibrium equation is established to solve the extreme value,and a calculation method for determining the fracture angle θcr of the wedge before the pile and the invalid embedment depth ycr of the pile is proposed.The engineering example is used to analyze the slope angle α of the rock foundation on the steep slope,the shear strength index of the rock foundation(cohesion c,internal friction angle φ),the weight of the wedge W,the calculated width Bp of the pile,and the pressure diffusion angle λ of the rock.The influence of the body fracture angle θcr and the invalid embedment depth ycr of the pile.The study found that the slope angle α of the rock foundation on the steep slope,the shear strength index of the rock foundation(cohesion c,internal friction angle φ),the weight of the wedge W against the fracture angle θcr of the wedge before the pile,and the invalid embedment depth ycr of the pile are all It has a large effect.The calculation width Bp and the pressure diffusion angle λ of the rock mass have a greater effect on the invalid embedded depth ycr of the pile body before the pile,but have little effect on its fracture angle θcr.(2)Based on the theoretical analysis in Chapter 2,using FLAC3 D 6.0 numerical simulation software,a finite difference model of the pile-rock-soil interface mechanics is established,and the numerical simulation method is used to analyze the damage behavior of the rock mass in front of the pile under the action of landslide thrust.A single variable method is used to change various influencing parameters such as the internal friction angle of rock and soil,cohesion,pile spacing,and embedment depth,etc.,and the degree and law of the influence of each influencing factor on the failure of the wedge in front of the pile are obtained.(3)Select a typical steep rock slope in a residential area as the research object,and calculate the anti-sliding pile design for this slope.Combine the previous theoretical analysis and numerical simulation analysis results to calculate the effective embedded depth of the anti-sliding pile.The effective embedding depth of the anti-sliding pile is applied to the calculation of the internal force of the anti-sliding pile.