强降雨特性对饱和–非饱和边坡失稳破坏的影响

doi:10.13722/j.cnki.jrme.2014.s2.088

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Abstract Based on surveying and summarizing typical domestic landslide disasters，a saturated-unsaturated slope model was generalized and the software platform of ABAQUS was applied to solve the model by method of a coupled analysis of transient seepage field and stress field under the infiltration of heavy rainfalls. Combined strength reduction technique to analyze the slope stability under transient seepage，and safety factors of the overall stability were gained，proposing and implementing the evaluation method of failure approach index(FAI) by coupling of seepage and stress fields，revealing slope rock mass strength reserve，the degree of damage and criticality of non-rupture areas to explore the impacts of heavy rainfall characteristics on slope failure mechanism and stability from various angles. Results showed that：(1) Heavy rainfall will lead stress levels to deteriorate in the slope free face particularly lower rock mass，with easily bring about flow erosion damage and partial collapse. (2) The effect of rainfall patterns on time and space evolution of pore pressure，deformation response，safety factors and FAI is obvious，pore pressure and deformation are positive correlation to different raininesses. (3) Pore pressure will increase gradually under the long duration rainfall with low intensity and easily lead to deep slide damage. The slope toe is the first failure region under the short duration rainfall with high intensity. (4) Rain intensity is inversely proportional with the safety factor which is reduced by approximately 17% when raininess varies from 12 mm/h to 36 mm/h，which affects the extent of failure parts and criticality in non-rupture parts，and high-intensity rainstorms make it easier for the slope toe slippage.

Key words： slope engineering rainfall infiltration saturated-unsaturated seepage rainfall pattern rainfall intensity failure approach index

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	Articles by authors
	ZHANG Sherong
	TAN Yaosheng
	WANG Chao
	YU Mao

Cite this article:

ZHANG Sherong,TAN Yaosheng,WANG Chao, et al. INFLUENCE OF HEAVY RAINFALL CHARACTERISTICS ON SATURATED-UNSATURATED SLOPE FAILURE[J]. , 2014, 33(S2): 4102-4112.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.s2.088 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS2/4102

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