Deterioration model of mechanical properties of limestone considering dissolution

被引：0
|
作者：
Tang Y. [1 ,2 ]
Liu Y. [1 ,2 ]
He C. [1 ,2 ]
Shang Y. [1 ,2 ]
机构：
[1] Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Hubei, Yichang
[2] School of Civil Engineering and Architecture, China Three Gorges University, Hubei, Yichang
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷
基金：
中国国家自然科学基金;
关键词：
constitutive model; dissolution; elastic modulus; limestone; mechanical properties; rock mechanics;
D O I：
10.13722/j.cnki.jrme.2022.1110
中图分类号：
学科分类号：
摘要：
At present, there are few tests and constitutive models on the mechanical properties of limestone under dissolution. In order to reveal the influence of dissolution on the deterioration of mechanical properties of limestone, a constitutive model suitable for describing the deterioration of mechanical properties of limestone under dissolution was established. Firstly, based on the results of uniaxial compression tests of limestone under dissolution, the mechanical properties of limestone are deeply analyzed, and the results show that the elastic properties and strength properties of limestone are affected by dissolution and plastic characteristics. Secondly, based on the strain softening model, the deterioration model of mechanical properties of limestone under dissolution(DLDM) was established from three aspects:elastic increment rule, yield criterion, and flow rule. Then, the method of FLAC3D-machine learning was used to obtain the specific change law of limestone mechanical parameters(elastic modulus, cohesion, internal friction angle) with dissolution action and equivalent plastic strain. Finally, the rationality of the DLDM model was verified by comparing the existing experimental values with the calculated values. The validation analysis indicates that the calculation results of the DLDM model are consistent with the uniaxial compression test results of limestone, Therefore, the deterioration evolution law of elastic modulus and strength parameters during the failure process of limestone can be accurately described. Besides, the theoretical basis for the stability analysis of surrounding rock of underground engineering in karst strata is provided. © 2023 Academia Sinica. All rights reserved.
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页码：4091 / 4098
页数：7
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