Research of Slope Stability Analysis Considering Rainfall Infiltration

Abstract:

Based on the saturated-unsaturated seepage theory and considering soil-hydraulic permeability coefficient characteristic curves of rock slope, the variation of suction in unsaturated region and transient saturated zone formation of rock slope were analyzed. Combined with engineering example, the strength reduction methods were adopted to analyzing the rock slope stability influence factors considering unsaturated seepage with different rainfall intensity and duration. The results show that the flow domain owing to rainfall infiltration mainly appears surface layer region of slope. The rainfall infiltration caused the groundwater level rise, the rising of transient pore water pressure and the fall of suction in unsaturated region caused the slope stability decrease. The rainfall intensity and duration have obvious influence on slope stability, and in the same rainfall duration condition, the safety coefficient of slope decreases with the accretion of rainfall intensity. With the rainfall duration increasing, the water in soil has more deep infiltration, the water content and pore water pressure was higher in the same high position, the decreasing of suction caused the safety coefficient of slope has more reduce.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 487-491
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.487
• Online since: October 2012
• Authors: Jian Hua Liu, Zhi Min Chen, Wei He
• Keywords: Rainfall Infiltration, Slope, Strength Reduction Method, Unsaturated Seepage

References

[1] ZHAO Ming-hua, ZHANG Ling, YANG Ming-hui. Settlement calculation for long-short composite piled raft foundation. Journal of Central South University of Technology, Vol.13, No.6, p.749−754(2006). in Chinese

DOI: 10.1007/s11771-006-0026-4

[2] MCCULLOUGH N J, DICKENSON S E. The behavior of piles in sloping rock fill at marginal wharves. Journal of Geotechnical and Geoenvironmental Engineering, Vol.16, No.1, p.1−10(2004). in Chinese

DOI: 10.1061/40727(2004)86

[3] CHEN Wei-fa and LIU Xi-la. Limit analysis in soil mechanics. (Amsterdam: Elsevir Science, 1990)

[4] DAI Zi-hang. Study on distribution laws of landside-thrust and resistance of sliding mass acting on anti-slide piles. Chinese Journal of Rock Mechanics and Engineering, Vol.21, No.4, p.517−521(2002). in Chinese

[5] WAISH J B. Effect of pore pressure and confining pressure on fracture permeability. Int J Rock Mech Min Sci Geomech Abstr, Vol.28, No.5, p.429−435(1991). in Chinese