Statistical Damage Model of Rock Based on Compaction Stage and Post-Peak Shape under Chemical-Freezing-Thawing-Loading

被引：6

作者：

Hu, Bin ^{[1
,2
]}

Zhang, Zhen ^{[1
,2
]}

Li, Jing ^{[1
,2
]}

Xiao, Huiping ^{[3
]}

Cui, Kai ^{[1
,2
]}

机构：

[1] Wuhan Univ Sci & Technol, Sch Resources & Environm Engn, Wuhan 430081, Peoples R China

[2] Hubei Key Lab Efficient Utilizat & Agglomerat Met, Wuhan 430081, Peoples R China

[3] Huangshi Construct Market Management Stn, Huangshi 435000, Hubei, Peoples R China

来源：

JOURNAL OF MARINE SCIENCE AND ENGINEERING | 2022年 / 10卷 / 05期

基金：

中国国家自然科学基金;

关键词：

chemical erosion; freeze-thaw cycles; constitutive model; Weibull distribution; pore compaction; post-peak shape; CONSTITUTIVE MODEL; DEGRADATION; PARAMETERS;

D O I：

10.3390/jmse10050696

中图分类号：

U6 [水路运输]; P75 [海洋工程];

学科分类号：

0814 ; 081505 ; 0824 ; 082401 ;

摘要：

The deterioration of rock mechanical properties under chemical-freezing-thawing-loading will seriously threaten the stability and safety of engineering rock mass, so the study of its constitutive model has very important theoretical and engineering application significance. In view of the deficiency that the existing statistical damage constitutive model cannot describe the nonlinear characteristics of the compaction stage and the post-peak shape, the compaction index is introduced to measure the stress-strain nonlinear characteristics caused by the iso-compression of the pores in the rock, and the post-peak correction coefficient is introduced to optimize the post-peak shape of rock loading. Assuming that the strength and failure of rock microunits obey the Weibull distribution, on the basis of using the Drucker-Prager strength criterion to measure the strength of rock microunits, a statistical damage model for rock considering the compaction stage and post-peak shape under chemical-freezing-thawing-loading is established. Finally, it is compared with the test curve. The results show that the calculation curve of the established chemical-freezing-thawing-loading rock statistical damage model has the same trend as the rock uniaxial compression test curve. Furthermore, it can better describe the rock stress-strain law with different chemical solutions and different freeze-thaw cycles, which fully reflects the rationality and accuracy of the constructed constitutive model. The research results can provide a theoretical basis for the calculation of deformation and failure of rocks under chemical-freezing-thawing-loading.

引用

页数：18