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《Journal of Zhejiang University(Engineering Science)》 2007-09
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Catastrophe analysis for disaster of mountain slope stability affected by rainfall seepage and surface crack

ZHANG Wo-hua,CHEN He-long,CHEN Yun-min(Key Laboratory of Soft Soils and Geoenvironmental Engineering,Ministry of Education,Zhejiang University,Hangzhou 310027,China)  
The catastrophe theory in the modern nonlinearly analysis was introduced to study the mechanism of mountain slope slip under paroxysmal instability and gradually evolutional failure.The effects of erosion damage due to rainfall seepage within the surface crack and the infirm soft layer were taken into account to express the soften evolution behavior of material strength and structural stiffness in the infirm slip layer of the mountain slope and develop the catastrophe hazard model.Analysis on occurring conditions of mountain slip disaster shows that the variation of external environmental conditions,such as rainfall,cracks and seepage,as well as the evolution of the internal effective stiffness ratio between the elastic region and the strain soften region at the turn around point on the constitutive curve of the material within the infirm layer on the slip surface may cause the topological relation of the catastrophe theory for the mountain slope stability problem.The catastrophe evolution of nonlinear slope stability appears the hazard behavior when the variation path of internal and external factors of the mountain slope stability system crosses into the "disaster trigon" of the bifurcation gather.This developed model may carry out some useful knowledge to understand the disaster mechanism and the evolutional or accumulative process of hazard factors in mountain slope stability problem,which may have an important meaning further to advance the technique of forecasting,preventing and controlling the disaster of mountain slope slip.
【Fund】: 国家自然科学基金资助项目(50379046);; 教育部博士点基金资助项目(A50221)
【CateGory Index】: P642.22
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