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Study on the Damage Characteristic of the Compacted Loess of Roadbed and the Application of Project

Author: ShangTao
Tutor: NiWanKui
School: Chang'an University
Course: Geological Engineering
Keywords: Compacted loess Damage Damage threshold Damage variable Engineering applications
CLC: U412.22
Type: Master's thesis
Year: 2007
Downloads: 41
Quote: 0
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Abstract


Compacted loess is a certain the compaction function and method ( such as RCC Act or the dynamic compaction Act ) , with a certain level with and loess moisture content of loosely compacted soil with a certain intensity , compacted loess on the road significant stability , the compacted loess force is also affected by the injury process . Damage theory development and complement the classical theory of solid mechanics , both to reflect the changes in the material microstructure , but also the actual description of macroscopic mechanical properties change . Damage and compacted loess combination study the compacted loess injury characteristics is the main content of this article . First , soil samples before and after compaction particle analysis and scanning electron microscopy , changes in the structure of the analysis compacted loess that compacted loess particles thinner , large pores significantly reduce the micro- structure by the flocculated micro cemented structure structure and stacked structure and inlaid bracket macroporous micro - cemented structure becomes variable density , soil structure ; statistical compacted loess basic physical and mechanical changes in the indicators , compacted loess stress-strain relationship , learned the compacted loess traits more perfect ; obtained through the analysis of the of compacted loess structure and traits the compacted loess real damage macro performance under stress or water content changes , the emergence and development of the plastic zone ; micro new structure of small and medium-sized particles of cohesion and resistance to the point enough to resist the stress when the soil inside the scratch, from small to large unrecoverable structural damage . Secondly , the damage threshold is compacted loess began starting point of injury , through triaxial tests and in situ load test , you can find the damage threshold , and quantitative analysis to study the the compacted loess damage threshold tamping energy , critical edge load , the relationship between water content , degree of compaction and consolidation pressure , and were fitted relationship formula . Finally, select the additional stress as the damage variable parameters , compacted loess damage evolution equation applied to the final settlement calculation of embankment , find out the depth of compacted loess injury threshold calculated the damage variable , and then considering injury settlement , and then compared with the traditional calculation and finite element simulation , and come to consider the point of view of the damage is more in line with the actual situation , it is stated that the injury consider the significance of the of compacted loess research and engineering applications .

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CLC: > Transportation > Road transport > Road works > Planning, surveying and design > Survey > Soil,geological and geographical investigation
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