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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摘要前溶蚀作用下灰岩的力学特性试验及其本构模型偏少，为揭示溶蚀作用对灰岩力学性质的劣化影响，建立适用于描述溶蚀作用下灰岩力学性质劣化的本构模型。首先，基于溶蚀作用下灰岩单轴压缩试验结果，深入分析灰岩的力学特性，结果表明灰岩弹性性质和强度性质会受溶蚀作用和塑性特征影响；其次，基于应变软化模型，从弹性增量法则、屈服准则和流动法则3个方面建立溶蚀作用下灰岩力学性质劣化模型(deterioration model of mechanical properties of limestone under dissolution，DLDM)；然后，采用FLAC3D–机器学习方法得到灰岩力学参数(弹性模量、黏聚力、内摩擦角)随溶蚀作用和等效塑性应变的具体变化规律；最后，对比已有试验值和模型计算值，验证DLDM模型合理性。验证表明，DLDM模型的计算结果与灰岩单轴压缩试验结果相吻合，能够准确地描述灰岩破坏过程中弹性模量、强度参数劣化演化规律，同时该模型可为岩溶地层中地下工程围岩稳定性分析提供理论依据。

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	汤艳春1
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	刘扬1
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	何城虎1
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	商妤凡1
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关键词 ：岩石力学, 灰岩, 溶蚀作用, 力学特性, 本构模型, 弹性模量

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

引用本文:

汤艳春1，2，刘扬1，2，何城虎1，2，商妤凡1，2. 考虑溶蚀作用的灰岩力学性质劣化模型[J]. 岩石力学与工程学报, 2023, 42(S2): 4091-4098.
TANG Yanchun1，2，LIU Yang1，2，HE Chenghu1，2，SHANG Yufan1，2. Deterioration model of mechanical properties of limestone considering dissolution. , 2023, 42(S2): 4091-4098.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.1110 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/4091

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