Study on Constitutive Mode of Three Typical Rocks Based on Triaxial Compression Test

Abstract:

In order to study the relationship between the design parameters of the shield machine and the strength of rock, the behaviours of rocks under the conventional triaxial compression, the complete stress-strain curves under different confining pressures of three typical rocks, i.e. granite, limestone and red sandstone, were taken out for analysis. From the curves, the values of elastic modulus E and Poisson's ratio μ were gained and the relationships between the following parameters were figured out, which are peak strength versus confining pressure, residual strength versus confining pressure, strain at peak strength versus confining pressure, and strain at residual strength versus confining pressure. According to the values and relationships, the complete stress-strain curves were divided into three parts. For each part, a constitutive equation was established by using the strain softening trilinear elastic-brittle-plastic constitutive model, and all the related parameters in the constitutive equations were also presented, which provide a theoretical foundation for the digital design of the cutter head and cutters of Shield machine.

• Periodical: Applied Mechanics and Materials (Volumes 170-173)
• Pages: 322-326
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.170-173.322
• Online since: May 2012
• Authors: Kui Chen, Ren Hua Yang, Tao Xu, Ya Jing Qi
• Keywords: Constitutive Model, Granite, Limestone, Red Sandstone, Rock Mechanics, Triaxial Compression Test

References

[1] Fan Zhang: Design, Study on Mechanical Behavior and Constitutive Relations of the Three Gorges granite (MS., Wuhan Institute of Rock and Soil Mechanics The Chinese Academy of Sciences,China 2007) ,P.49. (In Chinese)

[2] Weizhong Zhang, Congxin Chen and Mingyuan Yu: submitted to Journal of Rock and Soil Mechanics (2009) (In Chinese)

[3] Zhonghua Guo, Zhende Zhu and Xiangjuan Yu: submitted to Journal of Journal of Hohai University (2002) (In Chinese)

[4] Jianwu Pan, Chengdong Su: s Journal of Mining & Safety Engineering (2010) (In Chinese)

[5] Shengqi Yang, Chengdong Su and Weiya Xu: submitted to Rock and Soil Mechanics (2009) (In Chinese)