TY - JOUR

T1 - Case Study

T2 - Slope Stability Assessment Considering 3D Nonlinear Shear Strength

AU - Liu, Kai

AU - Wang, Guocai

AU - Yuan, Peng

AU - Zhang, Huijian

N1 - Funding Information: This research is sponsored by the National Natural Science Foundation of China (Grant No. 52178364).

PY - 2024/1

Y1 - 2024/1

N2 - In this paper, factor of safety (FOS) considering three-dimensional (3D) and nonlinear shear strength of geomaterials is formulated based on the modified spatial mobilized plane (MSMP) model. The MSMP model has the desirable features of considering 3D strength and the nonlinear shear behavior of soils, compared with the widely used Mohr-Coulomb (M-C) model. The MSMP model is developed from the spatial mobilized plane model by relating the internal friction angle to the mean effective stress within the framework of critical state soil mechanics. Based on the developed MSMP model and the geometric relationships in the mobilized effective normal-shear stress plane, the nonlinear 3D FOS is defined as the ratio of mobilized shear strength to shear stress. The developed nonlinear 3D FOS is applied to slope parametric and case studies. The parametric studies show significant differences between the nonlinear 3D FOS by the MSMP model and the traditional linear two-dimensional (2D) FOS by the M-C model. The case study shows that the MSMP model and nonlinear 3D FOS can better capture the developed failure slope zone than the M-C model and linear 2D FOS.

AB - In this paper, factor of safety (FOS) considering three-dimensional (3D) and nonlinear shear strength of geomaterials is formulated based on the modified spatial mobilized plane (MSMP) model. The MSMP model has the desirable features of considering 3D strength and the nonlinear shear behavior of soils, compared with the widely used Mohr-Coulomb (M-C) model. The MSMP model is developed from the spatial mobilized plane model by relating the internal friction angle to the mean effective stress within the framework of critical state soil mechanics. Based on the developed MSMP model and the geometric relationships in the mobilized effective normal-shear stress plane, the nonlinear 3D FOS is defined as the ratio of mobilized shear strength to shear stress. The developed nonlinear 3D FOS is applied to slope parametric and case studies. The parametric studies show significant differences between the nonlinear 3D FOS by the MSMP model and the traditional linear two-dimensional (2D) FOS by the M-C model. The case study shows that the MSMP model and nonlinear 3D FOS can better capture the developed failure slope zone than the M-C model and linear 2D FOS.

KW - Factor of safety

KW - Modified spatial mobilized plane

KW - Mohr-Coulomb

KW - Nonlinear shear strength

KW - Slope

KW - Three-dimensional strength

UR - http://www.scopus.com/inward/record.url?scp=85178392103&partnerID=8YFLogxK

U2 - 10.1007/s12205-023-2264-5

DO - 10.1007/s12205-023-2264-5

M3 - Article

AN - SCOPUS:85178392103

VL - 28

SP - 124

EP - 138

JO - KSCE journal of civil engineering

JF - KSCE journal of civil engineering

SN - 1226-7988

ER -