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Mathematical Problems in Engineering
Volume 2017 (2017), Article ID 3569826, 6 pages
Research Article

A New Calculation Method for the Soil Slope Safety Factor

1College of Material Science and Engineering, Jilin University, Changchun 130022, China
2School of Transportation Science and Engineering, Jilin Jianzhu University, Changchun 130118, China

Correspondence should be addressed to Mingzhi Sun

Received 27 February 2017; Revised 25 July 2017; Accepted 6 September 2017; Published 9 October 2017

Academic Editor: Dane Quinn

Copyright © 2017 Fu Zhu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Based on the unified strength theory, a new method to calculate the plane soil slope safety factor was derived that considers the effect of intermediate principal stress and at-rest lateral pressure coefficient . Calculation examples from the literature were used to compare the new calculation method and the current slice method; the results showed that both provided good consistency. The new method can provide a reference for slope stability evaluation. The new method was used to calculate the soil slope safety factors for different values of intermediate principal stress parameter , double shear stress parameters , and static lateral pressure coefficient . The results showed that the safety factor increased when was increased; first increased and then decreased when was increased; and increased when was increased. These results show that the intermediate principal stress as well as the stress state and its changes cannot be ignored during soil slope stability analysis. The slope soil characteristics and stress state should be considered to determine the unified strength theoretical parameters and static lateral pressure coefficient, maximize the potential of slope soil strength, and effectively reduce the costs of soil slope engineering.