考虑溶蚀作用的灰岩力学性质劣化模型

doi:10.13722/j.cnki.jrme.2022.1110

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Abstract 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.

Key words： rock mechanics limestone dissolution mechanical properties constitutive model elastic modulus

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	Articles by authors
	TANG Yanchun1
	2
	LIU Yang1
	2
	HE Chenghu1
	2
	SHANG Yufan1
	2

Cite this article:

TANG Yanchun1,2,LIU Yang1, et al. Deterioration model of mechanical properties of limestone considering dissolution[J]. , 2023, 42(S2): 4091-4098.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1110 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS2/4091

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