The Numercial Simulation Of Embankment Over Slope Weak Ground Reinforced By Gravel Piles Joint With Slide-Resistant Piles And Non-Embeded Pile-Plank Structure

Embankment over sloped weak ground is required to consider the stability and deformation. It has been used in engineering practice that use gravel piles to reinforce weak layer and implement slide-resistant piles at the toe of slope, however the working mechanism of joint reinforcement is not yet clear. This paper studied the soil’s horizontal displacement, vertical settlement and slide-resistant pile’s internal forces and deformation under four kinds of working conditions by using3D fast Lagrangian analysis of continua by building numerical analysis model of embankment over sloped weak ground reinforced by no reinforcement, gravel piles, slide-resistant piles and gravel piles joints with slide-resistant piles. Orthogonal experimental design method was conducted to study the sloped weak layer’s gravity, cohesion and internal friction influence on the slide-resistant pile maximum moment. Using gravel piles and slide-resistant piles can respectively constrain the vertical settlement and horizontal displacement of embankment over sloped weak ground significantly. The potential sliding surface can move up to a certain extent after reinforced by gravel piles, at the same time, slide-resistant piles’internal force and deformation compare with using slide-resistant pile without treatment has large attenuation, as for using gravel piles joints with slide-resistant pile to reinforce the embankment over sloped weak ground, the slide-resistant’size of cross section, steel ratio and length can be decreased to realize the design of slide-resistant technical and economic optimal.Non-embeded pile-plank structure is mainly used for constraining the vertical settlement and bearing of high-speed railway and passenger dedicated railway.But the theoretical research of pile-plank structure apply to embankment over sloped weak ground is not yet deeply developd.Building numerical analysis model of embankment over slope weak ground reforced by non-embeded pile-plank structure based on the3D fast lagrangian analysis of continua,and getting the stability safety factor of embankment by means of shear strength reduction. Orthogonal experimental design method also was conducted to study the height of embankment, the rate of slope ground and the thickness of slope weak layer influence on the embankment over slope weak ground reinforced by non-embendded pile-plank structure. The results show that:the stability safety factor of embankment over slope weak ground reinforced by non-embendded pile-plank structure decreased,while the height of embankment-. the rate of slope ground and the thickness of slope weak layer increased.The rate of slope ground influence on the stability of the embankment reforced by pile-plank structure more singnificantly than the height of embankment and the thickness of slope weak layer.And with the increase of rate of slope ground,the rate of failure of embankment over slope weak ground reinforced by non-embendded pile-plank structure increases rapidly.The design of embankment over slope weak ground reinforced by non-embended pile-plank structure should take full account of the lateral sliding risk caused by the rate of slope ground.