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The Loess High Slope Stability Analysis and the Pile Group Study

Author: ZhangDaZheng
Tutor: LiHong
School: Chang'an University
Course: Structural Engineering
Keywords: Loess slope Pile Foundation Stability Carrying capacity
CLC: U416.14
Type: Master's thesis
Year: 2011
Downloads: 52
Quote: 0
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Abstract


Slope stability analysis is one of the three classic problems of soil mechanics, an important issue in geotechnical engineering. Northwest China Loess stratigraphy full multi-type, widely distributed, large thickness, road and railway construction in the loess region, facing a large number of high slope, how to ensure that the key to high loess slope stability, road and railway construction One of the problems. While in the high slope on the bridge pier pile foundation, its force is more complex. In addition to the upper part of the vertical and horizontal load bear coming from the top of the pile, pile, pile side but also bear the slope of the thrust of both the characteristics of active the pile and passive pile. Guyuan region's new railway engineering background, typical loess area road cutting high slope, high slope on the bridge abutments and piers for the object based on material non-linear finite element numerical simulation technology, systems research high slope stability of abutment - pile - the Slope system and the pier cap - Pile - under the most unfavorable load slope system stability and mechanical behavior. Strength reduction finite element-based multi-level Loess Cutting Slope stability studies obtained different collapsible larger impact, thus affecting the degree of slope stability bearing capacity of high loess slope stability key loess subsidence caused by strength reduction. Loess cutting slope failure, multi-level first start from the bottom foot of the slope, the foot of the slope stress concentration causes the first peak of the shear strength of the soil and destruction, sloping shoulder resulting in cracking and shear stress can not afford to pass to the near point, so its strength is reduced; decreased as the shear stress, in turn, passed, and finally, the whole strength of the slip plane, slip plane starts overall slump destruction. Loess high slope on the bridge abutment - pile - slope system based on nonlinear finite element analysis, in the normal use of the most unfavorable load case, the the abutments - Pile - slope system instability mainly due to the destruction of the soil of the bottom of the pile; Slope - Bridge - pile foundation system loaded to its maximum carrying capacity, slope soil no apparent slip surface abutments deviate from the slope some distance can guarantee the stability of the slope. Pile side soil obvious hierarchical nature, pile stress in the soil boundaries parts prone to the mechanical characteristics of the plastic yield area, reflecting the high slope on the abutments to withstand the larger pile Houtu thrust. By high loess slope on the pier cap - pile - slope system based on nonlinear finite element analysis, Slope - cap - pile foundation system instability mainly due to the normal use of the most unfavorable load case The pile side loess destroy the pile and soil slip separation, loss of vertical carrying capacity in the pile. Of Pile all for loess pier pile foundation, pile foundation in the most unfavorable load stress in pile top bit larger, and the first crack, it is recommended that should strengthen the top of the pile and pile cap reinforcement and structural design of joints. The pile foundation stress and displacement results show that the force along the longitudinal and transverse different parts of the pile foundation there are big differences, reflecting the strong role of soil thrust force effect and pile Houtu of asynchronous pile group.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Subgrade > Slope
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