酸性环境干湿循环作用下石灰岩的物理力学特性及损伤本构模型研究  

Physical and Mechanical Properties and Damage Constitutive Model of Limestone under Dry-wet Cycle in Acidic Environment

作　　者：周文强 张翔 范翔 ZHOU Wen-qiang;ZHANG Xiang;FAN Xiang(School of Architecture and Planning,Yunnan University,Kunming 650504,China)

机构地区：[1]云南大学建筑与规划学院,昆明650504

出　　处：《科学技术与工程》2025年第8期3372-3381,共10页Science Technology and Engineering

基　　金：云南省科技厅基础研究专项面上项目(202401AT070446);云南大学第十三届研究生科研创新项目(2021Y288)。

摘　　要：为探究酸性干湿交替作用对石灰岩物理力学性能的影响,评价石灰岩岩体在此环境中的长期稳定性,以重庆市南川区金佛山甑子岩的石灰岩为研究对象,对中性与酸性环境干湿循环处理后的石灰岩岩样进行质量损失试验、吸水性试验、单轴压缩试验和抗拉试验。结果表明:在同一pH的浸泡溶液条件下,随着干湿循环次数的增加,岩样的质量损失率和饱水率增加;抗拉强度、单轴抗压强度和弹性模量逐渐降低;在相同干湿循环次数条件下,浸泡溶液的pH越低,岩样的物理力学性能损失越严重。基于试验结果,采用损伤理论、Weibull分布、Lemaitre应变等效假说以及M-C(Mohr-Coulomb)强度准则,用二次函数表征石灰岩应力-应变曲线压密阶段的非线性特征,建立并验证了石灰岩的损伤本构模型。In order to explore the effect of dry-wet cycles in acidic environment on the physical and mechanical properties of limestone,and to evaluate the long-term stability of limestone rock mass in this environment,the limestone of the Jinfo Mountain of the Nanchuan District in Chongqing was selected as research subject.The limestone specimens were exposed to dry-wet cycles under neutral and acidic environments.The specimens were treated through mass loss test,hygroscopic property test,uniaxial compression test and tensile test.The results show that under the condition of the same pH of the soaking solution,with the increase of the times of dry-wet cycles,the mass loss rate and saturation water absorption rate of specimens increase;the tensile strength,uniaxial compressive strength and elastic modulus gradually decrease;with the same times of dry-wet cycles,the lower the pH of the soaking solution leads to the more serious the loss of physical and mechanical properties.Based on the experimental results,the damage theory,Weibull distribution,Lemaitre strain equivalence hypothesis and Mohr-Coulomb(M-C)strength criterion,the damage constitutive model of limestone by using a quadratic function to characterize the nonlinear features of the compaction stage of stress-strain curve was established and validated.

关 键 词：石灰岩 酸性环境 干湿循环 物理力学特性 损伤本构模型 

分 类 号：TU452[建筑科学—岩土工程]