Stability analysis of high fill slope with loess under earthquake and rainfall infiltration

Abstract

Abstract: In order to investigate the effect of earthquake and rainfall infiltration on the stability of loess high fill subgrade slope, a dynamic seismic calculation, complete fluid-solid coupling calculation and strength reduction calculation are used to analyze and compare the loess high fill slope in use. The displacement time history, acceleration power spectrum, suction, effective stress and minimum safety factor of slope soil are used to study the effect of earthquake and rainfall infiltration conditions on the stability of loess high fill slopes. The results show that the effect of earthquake on the surface soil of loess high fill slope is greater than that on the base soil. The influence range of rainfall infiltration on the slope soil is surface soil and shallow soil. Rainfall infiltration reduces the suction and effective stress of the surface soil of the slope, while the local suction of the shallow soil is increased. In the process of rainfall, the effective stress of slope surface soil is decreased, the effective stress of the shallow soil is increased first and then decreases gradually. After the earthquake, the infiltration of the slope causes the change of the most dangerous slip surface area of the slope, the rainfall rate and rainfall duration have an impact on the minimum safety factor, and the minimum safety factor of the slope is decreased after the rainfall. This study provides a reference for the study of the stability of loess high-filled slope under 3D conditions of earthquakes and rainfall infiltration.

Key words: earthquake, rainfall infiltration, loess, high fill slope, stability

CLC Number:

TU42

YUAN Zhong-xia, LI De-peng, YE Shuai-hua. Stability analysis of high fill slope with loess under earthquake and rainfall infiltration[J]. Journal of Lanzhou University of Technology, 2022, 48(4): 119-125.

References

[1] 刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法 [J].岩土力学,2003,24(4):553-556+560.
[2] 刘春玲,祁生文,童立强,等.利用FLAC~3D分析某边坡地震稳定性 [J].岩石力学与工程学报,2004,23(16):2730-2733.
[3] 祁生文,伍法权,刘春玲,等.地震边坡稳定性的工程地质分析 [J].岩石力学与工程学报,2004,23(16):2792-2797.
[4] 徐光兴,姚令侃,李朝红,等.边坡地震动力响应规律及地震动参数影响研究 [J].岩土工程学报,2008,30(6):918-923.
[5] 王兰民,蒲小武,吴志坚,等.地震和降雨耦合作用下黄土边坡失稳滑移的振动台试验研究 [J].岩石力学与工程学报,2017,36(S2):3873-3883.
[6] 叶帅华,时轶磊.降雨入渗条件下多级黄土高边坡稳定性分析 [J].工程地质学报,2018,26(6):1648-1656.
[7] 唐栋,李典庆,周创兵,等.考虑前期降雨过程的边坡稳定性分析 [J].岩土力学,2013,34(11):3239-3248.
[8] ZENG L,BIAN H B,SHI Z N,et al.Forming condition of transient saturated zone and its distribution in residual slope under rainfall conditions [J].Journal of Central South University (English Edition),2017,24(8):1866-1880.
[9] 林鸿州,于玉贞,李广信,等.降雨特性对土质边坡失稳的影响 [J].岩石力学与工程学报,2009,28(1):198-204.
[10] LIU Z Z,YAN Z X,DUAN J,et al.Infiltration regulation and stability analysis of soil slope under sustained and small intensity rainfall [J].Journal of Central South University (English Edition),2013,20(9):2519-2527.
[11] 陈善雄,陈守义.考虑降雨的非饱和土边坡稳定性分析方法[J].岩土力学,2001,22(4):447-450.
[12] 刘子振,言志信.降雨入渗非饱和黏土边坡稳定性的极限平衡条分法研究[J].岩土力学,2016,37(2):350-356.
[13] 李绍红,朱建东,王少阳,等.考虑降雨类型的基岩型浅层边坡稳定性分析方法[J].水文地质工程地质,2018,45(02):131-135+149.
[14] LU Ning,LIKOS W J.非饱和土力学[M].北京:高等教育出版社,2012.
[15] 张芳枝,梁志松,周秋娟.非饱和土性状及其边坡稳定性[M].北京:中国水利水电出版社,2011.
[16] 董诚,郑颖人,唐晓松.利用有限元强度折减法进行渗流条件下的基坑整体稳定性分析[J].土木工程学报,2009,42(3):105-110.
[17] 李守德,王保田,张福海,等.降雨入渗与蒸发过程中非饱和土边坡土体吸力[J].水利水运工程学报,2005,3(3):31-36.
[18] 李忠,朱彦鹏.多阶边坡滑移面搜索模型及稳定性分析[J].岩石力学与工程学报,2006,25(S1):2841-2847.