Slope Slip Band Based on Circular Slip Surface   Yuan-wu Zhou, Xian-yuan Tang, Zhu Xiao-jing and E-zhen Liu Civil Construction Engineering Department, Guangxi University of Technology, Liuzhou 545006, P.R. China e-mail: zzyypp@163.com
			ABSTRACT

For selection of control variables for a slope’s circular slip surface, center coordinates and radius of circular slip surface were considered. Their search ranges are too large, so it is not easy to find the minimum of factor of safety. Proposed control variables are end-points abscissa and arc height of circular slip surface. Their search ranges are small, so it can rapidly find minimum of factor of safety. Many researchers focus on find slip surface with the smallest factor of safety. Different methods can indicate different slip surfaces, though usually they are almost the same. Obtaining a single slip surface is not very important issue in practice. Because of this uncertainty, a slip band composed of many slip surfaces may be more effective. Numerical computation shows that, for homogeneous soil slope, slip bands are almost the same based on Fellenius and Bishop methods, and width of slip band usually is less than 1 m.

Keywords: control variable; slip band; circular slip surface; slice method.

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