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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2015, Vol. 16 Issue (8): 644-655    DOI: 10.1631/jzus.A1500034
Civil Engineering     
Development and application of a statistical constitutive model of damaged rock affected by the load-bearing capacity of damaged elements
Ting-chun Li, Lian-xun Lyu, Shi-lin Zhang, Jie-cheng Sun
Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, China
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Abstract  It is difficult to establish a constitutive model of damage for rock materials due to the complex meso-mechanism of the rock deterioration process. In this paper, by analysis of the damage mechanism, the reason for the existence of a rock damage threshold is explained and we conclude that damaged rock elements of micro scale can still bear stress. The correlation between damaged and undamaged elements is examined in relation to stress distribution. Rocks under different initial conditions can be defined as undamaged materials with different properties, to avoid the issue of the solution of the undamaged condition and to simplify the damage model. On the basis of the Mohr-Coulomb criterion and theories of continuum damage and statistical mechanics, a constitutive model of rock materials affected by the load-bearing capacity of damaged elements under triaxial compression is established. Compared with previous experimental data and theoretical results, we show that this model can reflect the stress-strain relationship of the whole process of rock failure. In particular, the description of the strain softening stage after peak strength is proved to be more reasonable. Programming of the constitutive model applied to stability analysis of the Qingdao subway station is achieved by secondary development of FLAC3D. The computing results compare very well with field monitoring data, indicating that the constitutive model of damaged rock can reflect the deterioration effect of weathered rock at the site. This constitutive model of rock damage may provide a useful reference for practical application.

Key words： Rock materials      Damaged elements      Statistical theory      Load-bearing capacity      Constitutive model     
Received: 10 February 2015      Published: 04 August 2015
CLC:  TU45  
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Ting-chun Li
Lian-xun Lyu
Shi-lin Zhang
Jie-cheng Sun
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Ting-chun Li, Lian-xun Lyu, Shi-lin Zhang, Jie-cheng Sun. Development and application of a statistical constitutive model of damaged rock affected by the load-bearing capacity of damaged elements. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2015, 16(8): 644-655.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1500034     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2015/V16/I8/644

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