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Microstructure of Loess in Collapsibility, Seismic Subsidence and Liquefaction

Author: YangQunFang
Tutor: ZhangYuChuan
School: Lanzhou University
Course: Geotechnical Engineering
Keywords: Loess Collapsible Seismic subsidence Liquefaction Microstructures Fractal Fractal dimension Improve
CLC: TU444
Type: Master's thesis
Year: 2011
Downloads: 95
Quote: 0
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Abstract


Collapsible loess areas, seismic subsidence, liquefaction and other geological disasters, its essence is a the loess unique morphology. In recent years, with the rapid development of high-magnification scanning electron microscopy and computer image processing technology, micro-structure presented to the people a more realistic and comprehensive information to make more and more in-depth study of soil micro-structure technology. Loess microstructure using scanning electron microscopy (SEM) to reveal the microscopic mechanism of the loess of the special nature of the works, the macro-mechanical and micro-structure combination is one of the main directions of loess research. This paper first introduces the development of micro-structure, application of research tools, and image analysis and fractal geometry of collapsible seismic subsidence liquefied loess SEM image observation and analysis, and comparative analysis of intact loess pore size, the number of quantitative research loess under various conditions, pore distribution fractal dimension, aperture fractal dimension parameter changes by loess loess structure characteristic and analysis of the effect of different external causes disasters nature. Second, improved loess microstructure analysis, research loess compaction of soil under particle morphology, pore structure, changes in the performance of the force, as well as admixtures of loess effects of compaction and structural performance impact. The results show that the undisturbed loess has more overhead pore collapsibility of loess seismic subsidence, liquefaction, structural varying degrees of damage, reduce large pores, reduced porosity, seismic subsidence of loess minimal structural changes, collapsible loess slightly the large liquefied after loess change max. Fractal Dimension loess pore the porous fractal large size and porosity, fractal in structure to determine the nature of the loess. Cementation strength of loess structural stability. The stronger the role of water, cementation, the loess structure is more stable, able to withstand a strong earthquake; However, the action of water, cementation, the stronger the greater the strength of the structure flooding losses, the more prone collapsible and liquefied , greater deformation disaster. The loess by compaction, porosity drastically reduced pore distribution fractal dimension is also reduced. Lime significantly improved loess effect, the addition of lime can effectively reduce the loess porosity and pore distribution of the fractal dimension. The effect of lime - fly ash modified loess better than simply add lime, pore distribution fractal dimension reduction. Improved Loess with decreasing porosity, pore distribution of the fractal dimension decreases, the internal friction angle increases.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Various types of soil and foundation > Loess and foundation
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