doi:10.16186/j.cnki.1673-9787.2020.5.21

Received:2019/12/05

Revised:2020/02/26

Published:2020/09/15

Sensibility analysis of the influence factors on stability of permafrost slope

CHU Zhicheng, CHEN Penghui, LEI Shengyou, GUO Changzhi, CHEN Hongyu, WANG Hanwen

School of Highway， Chang，an University，Xi’an 710064 ， Shannxi， China

Abstract:In order to determine the sensitivity of influence factors on stability of permafrost slope， taking into account the damage of soil under freeze-thaw cycles and local freeze-thaw peculiarity of permafrost slope， based on the basic factors affecting slope stability， considering the freeze-thaw depth of seasonal active layer and freeze-thaw damage coefficient， the stability coefficient of permafrost slope was obtained by finite element thermal-mechanical coupling model， and it was used as the system characteristic quantity， then the interactive design for all the factors was carried out by using orthogonal test and adopting the improved grey relational analysis model to analyse the correlation degrees. The results showed that the soil cohesion was the most sensitive to the stability of the permafrost slope， followed by freeze-thaw damage coefficient， freeze-thaw depth of seasonal active layer， internal friction angle， angle of slope and weight of soil. It indicated that the effect of environmental factors were non-negligible， and it was extremely important to reduce the impact of extreme climate conditions on slope through effective measures for treatment of soil slope in permafrost region.

Key words:permafrost slope;freeze-thaw cycle;thermal-mechanical coupling;grey correlation analysis;sensitivity analysis

多年冻土边坡稳定性影响因素敏感性分析_褚志成.pdf