用有限元法研究降雨对青海云杉林边坡稳定性的影响

doi:10.16843/j.sswc.2019.06.002

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Abstract [Background] Helan Mountain is an ecological barrier and water conservation area of Yinchuan Plain, and it is also a serious area of soil and water loss. The geological disasters, such as debris flow and shallow landslide caused by strong rain intensity, have caused huge economic, cultural and ecological losses in this area. Therefore, the study of slope stability under extreme weather is of great significance to the economic and social development in Helan Mountainous area.[Methods] In order to study the effect of rainfall intensity and duration on the slope stability of Picea crassifolia forest in Helan Mountain, the geomechanical parameters of the root-soil composite of P. crassifolia were obtained by triaxial compression, saturated infiltration and other geotechnical tests. On this basis, the stability calculation model of P. crassifolia forest slope in Helan Mountain was established based on finite element theory and software (ABAQUS). The finite element model for stability calculation of P. crassifolia forest slope was used to calculate the variation of safety factor (F_s) and the duration at failures (t_f) with the rainfall duration under different rainfall intensity (i=10-25 mm/h), and the intensity and duration at failures regression (ID) was fitted. Based on the analysis of maximum displacement (U_max) and maximum plastic strain (PEMAG_max) during the slopes without and with trees failure induced by the rainfall, the degree of slope stability improvement by the root-soil composite of P. crassifolia forest in Helan Mountain was quantified.[Results] 1) The safety factors of the slopes without and with trees decreased with the increase of rainfall duration, rainfall intensity and slope grade. The duration at failures of P. crassifolia forest slope under rainfall was significantly longer than that of the slope without trees (the average increase was 48.61%), and the regression relation between rainfall intensity and duration at failures satisfied the power function (The ID regression model:i=262.4t_f^-0.998, R²=0.999 6 (slope without trees); i=328.7t_f^-0.945, R²=0.999 (slope with trees)). 2) Under rainfall conditions, because of the effect of vegetation, the growth rate of duration at failures were 53.20% (i=10 mm/h), 50.57% (i=15 mm/h), 44.96% (i=20 mm/h) and 45.70% (i=25 mm/h) respectively and the average was 48.61%, however, the effect of root reinforcement on the slope decreased from 53.20% to 45.70%. The P. crassifolia forest obviously increased the maximum displacement U_max (224.42±80.29)% and the maximum plastic strain PEMAG_max(95.28±33.74)% when the slope failed.[Conclusions] The ID regression model, the maximum displacement and the maximum plastic strain of slopes without and with trees are obtained under rainfall, which prove that the P. crassifolia forest in Helan Mountain significantly enhances the slope stability.

Key words： finite element method rainfall intensity stability of slope root-soil composite numerical analysis Helan Mountain

Received: 23 October 2018

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S157.2

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	TIAN Jia
	HAN Lei
	JIN Xuejuan
	XU Lingling
	WANG Xiaoyan
	DONG Yaning

Cite this article:

TIAN Jia,HAN Lei,JIN Xuejuan, et al. Effect of rainfall on slope stability of Picea crassifolia forest based on finite element method in Qinghai[J]. SSWC, 2019, 17(6): 11-18.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.06.002 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I6/11

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