Dynamic Stress Concentration Factors and Damage Mode of Horseshoe Tunnels Crossing Fault Fracture Zone
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ORIGINAL PAPER
Dynamic Stress Concentration Factors and Damage Mode of Horseshoe Tunnels Crossing Fault Fracture Zone Hao Zhou . Changdi He . Siwei Wang . Fei Peng . Shiyi Zhu . Dongyang Yuan
Received: 27 March 2020 / Accepted: 9 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract A series of uniaxial compression tests are carried out firstly to confirm the reasonable surrounding rock parameters. Then building up the finite element analysis models of the horseshoe tunnel subjected to the seismic loads. The tunnel buried in different geological conditions, like the different plane angles between tunnel and fault fracture zone (e.g. 0°, 30°, 60° and 90°), different width of the fault zone (e.g. 1 m, 0.5D, 1.0D, 1.5D, 2.0D) (D is the tunnel width). The paper mainly discusses the dynamic stress concentration factors and damage mode on the horseshoe tunnel. Based on the experimental and numerical results, analyzing the distribution of dynamic stress concentration and damage mode on the tunnel, it can be concluded that the tunnel crossing fault fracture H. Zhou China railway NO. 5 Engineering group, Co., Ltd, Changsha 410007, China H. Zhou C. He (&) Department of Civil Engineering, Central South University, Changsha 410075, China e-mail: [email protected] C. He F. Peng S. Zhu D. Yuan Institute of Bridge and Tunnel Engineering, Zhejiang Scientific Research Institute of Transport, Hangzhou 310023, China S. Wang (&) School of Civil Engineering, Southeast University, Nanjing 211189, China e-mail: [email protected]
zone with the plane angle of 60° and the width of 1.0D are more hazardous, whose vertical convergent deformation, equivalent plastic strain (tensile), tensile damage and the slipping displacement of the fault are in the high level, when compared with other geological conditions simulated in the numerical analysis. Keywords Horseshoe tunnel Dynamic stress concentration Damage mode Seismic waves Uniaxial compression tests Numerical simulation
1 Introduction In recent years, the speed of tunnel construction increased dramatically, especially in the highway tunnel. When the tunnel built in the earthquake-prone region and passed through the fault fracture zone tend to be easily damaged, thus following studies related to the damage rule and anti-seismic measures of the tunnel are imperative. After conducting investigations into the earthquake disasters on the tunnel, the fault fracture zone was the primary causation (Lai et al. 2017; Zhao et al. 2019; Chai et al. 2020; Feng et al. 2020). Therefore, more and more scholars began to explore the dynamic stress characteristics and failure mode of the tunnel crossing fault fracture zone when motivated by severe dynamic loads. The position relationship between the tunnel and fault zone can be divided into three types that the
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Geotech Geol Eng
tunnel buried in the hanging wall, in the foot wall and across the fault (Huang et al. 2017). Fault slipping and seismic motion are the inducing factors for
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