Computational Accuracy Impact Factors of Slope Stability Safety Factor and Finite Element Strength Reduction Method

 

Zegen Wang

1. School of Civil Engineering and Architecture, Southwest Petroleum University, China 610500;
2. Structural Engineering Key Laboratory of Sichuan Higher Education, Southwest Petroleum University, China 610500; e-mail: zegen01@126.com

Xiaoyong Jiang

1. School of Civil Engineering and Architecture, Southwest Petroleum University, China 610500
2. Structural Engineering Key Laboratory of Sichuan Higher Education, Southwest Petroleum University, China 610500; e-mail: 103531764@qq.com

 

 ABSTRACT

The influence of three factors, (1) the selected artificial model boundaries, (2) elastic modulus, and (3) Poissonís ratio, on safety factor are studied. Existing literature only focuses on the results rather than an understanding of the inner causes and the potential impact. In our study reported in this paper, we analyzed these three factors in ANSYS environment, according to three indicators of feature, point displacement, plastic zone distribution, and the relative error of safety factor. The analysis results show: on the premise of taking L/H=1.5, R/H=2.0, B/H=1.0, the boundaries of the model should be chosen following the principle of completely containing the connectivity area of plastic zone; Elastic modulus and Poissonís ratio had indirect impact on the safety factor. When the elastic modulus is less than 108 kPa, it will have significant effect on the size of slope displacement, and the displacement curve is exponential. Besides, we account for this kind of curveís distribution law in terms of geotechnical material properties and physics. The Poissonís ratio has an effect on the distribution of the plastic zone, and the smaller the value is, the wider the range is.

Keywords: Finite elements, Strength reduction method; Safety factor; Impact factors.

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