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An approach to evaluate ground surface rupture caused by reverse fault movement

Zhao Jisheng (赵纪生)1,2 , Tao Xiaxin (陶夏新)1,3, Shi Lijing (师黎静)1 and Wang Haiyun (王海云)3

1. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China

2. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou 730000, China

3. Department of Civil Engineering, Harbin Institute of Technology, Harbin 150006, China

Abstract: An approach for estimating ground surface rupture caused by strong earthquakes is presented in this paper, where the finite element (FE) method of continuous and discontinuous coalescent displacement fields is adopted. The onset condition of strain localization is introduced to detect the formation of the slippage line. In the analysis, the Drucker-Prager constitutive model is used for soils and the rate- and state-dependent friction law is used on the slippage line to simulate the evolution of the sliding. A simple application to evaluate the ground surface rupture induced by a reverse fault movement is provided, and the numerical simulation shows good agreement with failure characteristics observed in the field after strong earthquakes.

Keywords: surface rupture; reverse fault; localized band; slippage line; onset and evolution strain localization; friction law