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The Study on the Stability and Settlement Deformation of High Fill Subgrade for Changan Comprehensive Test Track

Author: SunXiao
Tutor: ZhaoMingJie
School: Chongqing Jiaotong University
Course: Hydraulic structures
Keywords: Fill Subgrade Centrifuge model Settlement deformation Finite Element Analysis Stability Analysis
CLC: U416.1
Type: Master's thesis
Year: 2011
Downloads: 51
Quote: 1
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Abstract


With the rapid development of the world automobile industry, automotive proving ground construction has entered a new era. Thus corresponding with the construction standards of the automotive proving ground more and more high, have become increasingly stringent requirements of the test site on the subgrade and pavement. In the construction of the Chongqing Changan Automobile Proving Ground will be the first western large proving ground in view of the special requirements of the subgrade and fillers, the proving ground, and which is built in the west a proving ground, not mature enough experience and technology, and so on of Chang'an Proving Ground fill roadbed filler, and embankment settlement and stability analysis and research is necessary. According to the research data proving ground at home and abroad subgrade settlement, to the under construction Chang'an Proving Ground relying works by experimental studies and theoretical analysis, the proving ground Embankment settlement analysis and stability study, the paper mainly done the following tasks: (1) the roadbed filler taken back by the on-site soil test, such as moisture content test, compression test, direct shear test, triaxial test, penetration test, compaction test, to determine the basic physical parameters; design indoor determination roadbed for-fillers and embankment backfill deformation test program filler deformation index, which is determined by the the springback deformation of curves and the secondary deformation curve fill roadbed filler compaction characteristics of the study; (2) based on consolidation theory Embankment settlement deformation calculated in accordance with the requirements of construction, the construction work three weeks after the settlement reached the time control objectives were predicted; (3) fill roadbed construction body cross-section of four typical centrifugal model test study, obtained by test model settlement deformation of the cross-section and analysis of actual roadbed settlement deformation of the cross-section, the relationship of the roadbed height and the subgrade deformation, the results show that the roadbed in the use of the limestone soil Replacement after effectively improve the roadbed strength and stability, reduced deformation of the subgrade settlement; (4) the use of finite element software ANSYS, numerical simulation of the cross-section of the settlement deformation of roadbed embankment during the height of the settlement, embankment internal settlement distribution law, to make the evaluation of its stability. And high-speed ring road corners Replacement (embankments completely weathered mudstone filling road bed 4m using thickness of 8% lime soil reclamation, road bed ranging thickness of 8% lime earth filling) finite element simulation analysis, has been filling the maximum horizontal displacement of three ways, and the largest settlement deformation. Fill roadbed filler physical and mechanical parameters of the test embankment settlement and stability analysis of Chongqing Changan Automobile Proving Ground (Dianjiang) for the design and construction of Chang'an Proving Ground provides technical support and protection, but also for lay the foundation for the future construction of the test track in accumulated valuable experience and valuable technical information, so as to promote the technological progress of the construction of our automotive proving ground.

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