The Analysis of Anchoring Characteristics of Rock Slope Based on the Nonlinear Twin-Shear Criterion Subjected to Seismic
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ORIGINAL PAPER
The Analysis of Anchoring Characteristics of Rock Slope Based on the Nonlinear Twin-Shear Criterion Subjected to Seismic Loads X. B. Gu
Received: 3 December 2019 / Accepted: 26 June 2020 Springer Nature Switzerland AG 2020
Abstract The modified pseudo-dynamic method is introduced in the paper at first, then geometric model of anchoring characteristics of rock slope considering nonlinear twin-shear criterion subjected to seismic loads is established. Finally some correlated influential parameters on the anchoring characteristics of rock slope are analyzed, the conclusions are drawn that the minimum total anchoring force f increases as the increase of bolt inclination angle a, unit weight c and horizontal seismic acceleration coefficient kh; And minimum total anchoring force f decreases as the increase of internal friction angle /, vertical seismic acceleration coefficient kv , the geometric parameters mi and GSI and uniaxial compression strength rc ; when internal friction angle h is in certain range (h 18:1 ), the value of total anchoring force becomes smaller as the value of h and / increases, the slope becomes safer. These conclusions can bring great theoretical value to analyze anchoring characteristics of rock slope. Keywords Anchoring characteristics Rock slope Nonlinear twin-shear criterion Seismic loads
X. B. Gu (&) School of Civil Engineering, Nanyang Institute of Technology, Nanyang, China e-mail: [email protected]
1 Introduction The safe of people’s life and property is threatened by the slope failure under seismic loads. Especially since Wenchuan 8.0 earthquake occurs in china in 2008, the geotechnical engineering problem is caused much attentions (Zhou et al. 2012); The bolt is usually used to conduct support structure and it has great application on the support projection of slope. So it is very necessary to do further research of anchoring characteristics of slope under seismic loadings. Recently, many investigations about the analysis of anchoring slope have been done, the limit equilibrium method (Jewell 1987; Srbulov 2001), the upper limit analysis method (De et al. 1989; Porbaha et al. 2000), the lower limit analysis method (Singh and Basudhar 1993) and slip line method (Michalowski and Zhao 1995; Zhao et al. 1996), etc. are suggested to solve the stability of anchoring slope, for example, the slip line method is adopted to analyze anti-seismic bearing capacity by Jahanandish and Kehavarz (2005), and the limit dynamic method is used to obtain necessary anchoring force to prevent the fracture of slope. The above traditional method is applied to solve many problems, but these methods are only applied to solve the anchoring characteristics of rock slope considering the Mohr–Coulomb (Maghous et al. 1998) or Hoek–Brown criteria (Serrano and Olalla 1994). Obviously, the effects of intermediate principal stress are not taken into account. However, the true triaxial tests performed on rock by Mogi (1971), Lu
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