Research On Design And Numerical Simulation Of Anti-Slide Piles

Landslide is a geological hazard which distributed the most widely, and havecaused the most serious hazards in various types of slope failure. China is one of thecountries in the world which are affected severely by the landslides. With the rapiddevelopment of China economic, a large number of major projects such as ThreeGorges Project, high-speed railway, highway, and the reconstruction projects aferWen-chuan earthquake have been started. But due to the influences and limits oftopographic and geologic conditions, the projects above are damaged partly by thelandslides during the construction process. In order to protect life and property safety,the relevant departments attached great importance on the control of landslides, andhave taked many prevention and control measures.Anti-slide Piles are major engineering measures to control landslides, which havemany advantages such as having good sliding effect, location setting flexiblely, and thedesign can be improved by the verification of geological conditions during theconstruction process, etc, so anti-slide Piles have been used widely. At present, thedesign methods which is used commonly consider the anti-slide piles and landslideseparately, the interaction between the piles and landslide is simplified to a simple roleof force, the coordination of stress and deformation between the piles and landslide isnot considered. The retaining effect and validity of Anti-slide piles designed under thissimplified conditions can not determine effectively.And the common mechanism ofanti-piles and landslide under seism loading is rarely researched, there is also auncertainty in the design. Therefore, considering the interaction mechanism of landslideand anti-slide piles,the stability of landslide, the treatment effect after setting up piles,and the dynamic response of landslide after setting up piles under seism loading havebeen studied by computer numerical simulation. At the same time, the landslide thrustand internal force distribution of double-row anti-slide piles is studied systematically.The main contents of this paper is as follows:(1)Introduce the types of anti-slide pile, the requirements and the steps of pilesdesign. In addition, distribution of landslide thrust on the anti-slide pile and calculationmethods are discussed. At the same time, introduce the method of determine elastic andrigid piles and method of calculating internal forces(2) As a engineering landslide for background, use transfer coefficient method to calculate the landslide thrust and stability coefficient in natural condition and rainstormcondition. Indicating that the landslide is instability under the rainstorm condition, andit need to be supported. According the landslide thrust to calculate pile’s internal stressand draw the shear force and bending moment chart.(3) Considering the interaction mechanism of landslide and anti-slide pile, useFLAC3Dto carry out numerical simulation. The results show that the horizontaldisplacement is small in the natural condition, and the slope in a state of stability.However, in the rainstorm condition, the slope displacement is large, plastic zoneextends to the foot of the slope, the stability coefficient is decrease. After set upanti-slide pile, the horizontal displacement is significant decrease, plastic zone is alsodecrease. Show that the anti-slide pile plays a good role in landslide control to preventslip and enhance the slope stability.(4) Earthquake loading is an important factor which caused the instability oflandslides. From the dynamics point of view, the stability of landslide, treatment effectafter setting up piles, and the dynamic response of landslide after setting up piles underseism loading have been studied by FLAC3D.(5) The landslide thrust and internal force distribution form and distribution ofdouble-row anti-slide piles is studied systematically. And the impact of row spacing ofthe piles and pile spacing on the double-row anti-slide piles is also discussed.In summary, the characteristics of this thesis are as follows:(1) the treatment effectafter setting up piles is studied by computer numerical simulation;(2) the dynamicresponse of landslide after setting up piles under seism loading have been studied;(3)The landslide thrust and internal force distribution form and distribution of double-rowanti-slide piles is studied systematically. And the impact of row spacing of the piles andpile spacing on the double-row anti-slide piles is also discussed.