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Stability of high embankment

Author: ZhangLiPing
Tutor: LiXinSheng
School: Chang'an University
Course: Geological Engineering
Keywords: Loess High embankment Settlement Slope Stability Finite element strength reduction
CLC: U416.12
Type: Master's thesis
Year: 2005
Downloads: 322
Quote: 5
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Abstract


Highway construction in loess area, due to the nature and complexity of the loess special geological, geographical factors, many sections of the inevitable emergence of high fill embankment. So high embankment stability analysis has become one of the major problems currently facing, which includes embankment settlement and slope stability aspects. This experiment investigated through laboratory compacted loess deformation and strength properties. Indoor compacted loess from triaxial compression tests can be drawn, with the degree of compaction of K increases, the cohesion of compacted loess c increases a lot, and the internal friction angle φ substantial growth is relatively small. By-wire method to get a different degree of compaction (dry density) under the pressure coefficient of collapsibility relationship can be seen in the compaction of compacted loess is not sufficient in the case still has a collapsible. Under the terms of 200KPa collapsible coefficient of 0.015 for the evaluation criteria, as used herein soil dry density of less than 1.62g/cm ~ 3 corresponding to the degree of compaction is less than 95%, have a collapsible. Since the existing \Based on the results of laboratory tests embankment, combined with the existing high embankment soil parameters by limit equilibrium analysis and elastic-plastic finite element strength reduction on loess area high embankment slope at different soil parameters, slope type, slope height , slope stability when analyzed, and combined with a large number of high loess embankment slope forms actually exist, to meet the stability requirements, based on the combination of economy, propose a suitable Loess Embankment reasonable, practical possible cross section. Using the finite element method simulation of high embankment construction filling process, come to the settlement of high embankment deformation and high embankment settlement factors include embankment height, bulk fill, fill resilient modulus, deformation modulus of subsoil and so on. Closer to the centerline of the embankment, the larger settlement; Vietnam midline deviation from the embankment, settlement smaller cross section along the direction of the settlement basin-shaped curve. The final settlement of embankment embankment maximum occurs at the top of the road surface. With the embankment height, filling density increases, uneven road surface subsidence and sedimentation rates are increases. With the foundation soil deformation modulus and filling resilient modulus increases, uneven road surface subsidence and sedimentation rates are decreases, filling resilient modulus of deformation modulus of subsoil significantly affected. Compression itself accounts for high embankment embankment about 10% of the total settlement amount, can not be ignored.

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