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Numerical Simulation Studies on the Sustentation Structure of Anti-Sliding Piles

Author: ZhengZuoYan
Tutor: XiaYuanYou
School: Wuhan University of Technology
Course: Geotechnical Engineering
Keywords: Slope Stability Piles Soil arching Numerical calculation software FLAC3D Pile spacing
CLC: TU473.1
Type: Master's thesis
Year: 2005
Downloads: 595
Quote: 9
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Abstract

Landslide piles as effective engineering measures landslide in the world occupies an important position. According to statistics, so far, it is the most Landslide application of engineering structures. Commonly used methods to stabilizing piles and piles of landslide considered separately, the landslide body and the interaction of piles to a simple force, does not consider the landslide and piles of deformation and stress coordination coordination. In fact, soil arching is pile - soil interaction primary mode of action, related to soil arching piles can give full play to the role of anti-slide retaining. Impact piles pile - soil interaction of many factors, including soil interface parameters, thrust size, sliding body and anchoring layer physical and mechanical parameters, and pile anchorage depth, size, strength and other indicators. Establish the parameters of the pile - soil interaction between, you can take advantage of the pile - soil interaction, to optimize the design purposes. This main tasks include the following: (1) summarizes the history of development of piles, the current general principles of design calculations, design steps and so on. (2) an overview of piles arching effects research status, from the formation of soil arching, reasonable pile spacing, and soil properties on soil arching effect three aspects analyzed. (3) the use of numerical modeling of geotechnical engineering software FLAC ^{3D to establish a three-dimensional model and the parameters of numerical experiments, the whole pile depth of soil arching effect has been studied, and the formation of soil arching were analyzed. Select sliding mechanics parameters, pile size and spacing parameters such as numerical experiments were carried out to analyze soil arching effect and the relationship between various parameters for different thrust sliding body parameters under piles designed to provide guidance. The results showed that: piles of retaining the role of soil arching effect is the main mechanism of action; different depths landslide soil arching effect of different forms, under different soil arching thrust manifestations are different; cohesion high slip body, help to improve piles of reinforcement effect, when the cohesion exceed 20kPa after the increase rate decreases; higher slip angle of internal friction piles help to improve the reinforcement effect, when the internal friction angle exceeds 30 °, , reduce the impact; pile spacing increases will result in maximum displacement and pile-soil relative displacement increases, to a certain extent cause excessive soil between piles extrusion, making piles retaining failure; when to take the pile size 1 × 1.5m when the selected parameter in the test conditions, the critical pile pile spacing greater than 6m; when to take the pile size 2 × 3m when the selected parameter in the test conditions, the critical pile pile spacing greater than 8m.}

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