›› 2015, Vol. 36 ›› Issue (3): 795-802.doi: 10.16285/j.rsm.2015.03.025

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Damage constitutive model of rock under medium and low strain rates

CAI Can1，WU Kai-song1, 2，YUAN Xiao-hong1，CHENG Shao-jie3   

  1. 1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 2. Key Laboratory for Oil and Gas Equipment of Ministry of Education, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 3. Baoji Petroleum Machinery Co., Ltd., Baoji, Shaanxi 721000, China
  • Received:2014-01-03 Online:2015-03-11 Published:2018-06-13

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Abstract: When drilling is executed in the deep rock mass, rock is mainly subjected to loads with medium and low strain rates. However the medium and high strain rates damage constitutive model is still used instead, which doesn’t adapt to the real situation. The dynamic characteristics of rock under medium and low strain rates are analyzed from engineering background and practical experiments. A parallel model of rock, which is made up of Maxwell element, Bingham element and damage element, is proposed. The damage parameter based on degradation of pore and fissure is introduced with Laplace transformation. A new dynamic damage constitutive model of rock is derived. The proposed model is used to fit the stress-strain curves of argillaceous sandstone and granite at strain rates of 87 s-1, 382 s-1 and 673 s-1. By comparing fitting results with the experimental data and literature results, it is shown that the proposed model is suitable for the behavior of rock under medium and low strain rates. With analyzing the fitting parameters, the proposed model can actively adapt to medium and low strain rates. The variations of constitutive curves and damage parameters are in agreement with the practical situation.

Key words: rock mechanics, medium and low strain rate, damage, dynamic constitutive model, curve fitting

CLC Number: 

  • P634.1
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