Study on Slope Instability Disciplinarian on the Condition of Rainfall

Abstract:

Slope stability is one of the problems of road construction which should be faced with and solve. Rainfall can reduce the shear strength of slope soil and raise the underground water level which can lead to increase slope soil pore water pressure. The influence of rainfall infiltration on slop is mainly to change the slope seepage field, increase dynamic and hydrostatic water load on the slope soil and decrease of soil shear parameters. More abundant rainfall of typhoon area could make the road slope stability more fragile. Based on Matoushan Mountain along 104 state roads in Taizhou city, Zhejiang province, slope instability disciplinarian on the condition of rainfall is studied using the method of numerical simulation in this paper. As the results, when the rainfall intensity was 0.006 m/h and continuous rain was in 24 hours, the slope surface compressive stress tends to zero which began to appear tensile stress area on the condition of self-weight. And when the rainfall intensity was 0.01 m/h and continuous rain was in 24 hours, the large area of the slope surface was tensile stress area which means to appear break zone in slope surface and likely to landslide at the same time.

• Periodical: Applied Mechanics and Materials (Volumes 353-356)
• Pages: 654-658
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.353-356.654
• Online since: August 2013
• Authors: Nan Tong Zhang*, Xiao Chun Zhang, Hua Rong Wang, Chen Yan
• Keywords: Break Line, Infiltration, Rainfall, Slope Instability, Spring Line

References

[1] Pen Shizhen. Study on influence of precipitation on unsaturated soil slope stability[J]. Engineering construction, 2006, 38(3): 8-12.

[2] Yin Xiaopeng. Effects of Rain Infiltration on Numerical Simulation of SeePage and Stability Analysis of Slope[D]. Lanzhou: Lanzhou University, (2008).

[3] Chen Shouyi. A mehtod of Stablity Analysis Taken Effects of Infiltration and Evaporation into Consideration for Soil Slopes[J]. Rock and Soil Mechanics, 1997, 18(2): 8-12.

[4] Fredlund D G. Slope stability analysis incorporationing the effect of soil suction. In: Slope Stability. Anderson M.G. and Richards New York: Willey, 1987, 113-144.

[5] Lumb P. Effect of rainstorm on slope stability. Sym. on HongKong soils. Hong Kong, 1962: 73-87.

[6] Sammori T and Tsuboyama Y. Parametric study on slope stability with numerical simulation in consideration of seepage process. In: Proc. 6th Symp. On Landslide [C]. Rotterdam: A.A. Balkema, (1991).

[7] Alonso E, Gens A, Lioret A, Delahaye C. Effect of rain infiltration on the stability of slopes. Unsaturated Soils, 1995, 1, 241-249.

[8] Sun Y, Nishigaki M, Kchno I. A studuy on stability analysis of shallow layer slope due to raining permeation. Unsaturated Soils, 1995, 1: 315-320.

[9] Sun Y, Sakajo S, Nishimura M. Application research on a numerical model of two-phase flow in deformation porous medium. Int. Conf. Computer Methord and Advances in Geomechanics [C]. Rotterdam: Balkema A A, 1997. Ⅱ: 1171-1176.

[10] Wu Hongwei, Chen Shouyi, Peng Yuwei. Parametric Study of Effects of Rain Infiltration on Unsaturated Slopes[J]. Rock and Soil Mechanics, 1999, 20(3): 1-14.