水化-冻融耦合作用下大理岩蠕变长期强度  

Creep Long-Term Strength of Marble Under Coupling Effect of Hydration Freezing-Thaw

作　　者：赵越 牛心玉 齐晓磊 华玉涵 Zhao Yue;Niu Xinyu;Qi Xiaolei;Hua Yuhan(Mining Institute,Liaoning Technical University,Fuxin 123000,Liaoning,China;College of Innovation and Practice,Liaoning Technical University,Fuxin 123000,Liaoning,China;Liaoning Province Nonferrous Geology 103 Team Co.,Ltd.,Dandong 118008,Liaoning,China;Liaoning Team of Geological Survey Center of China Building Materials Industry,Shenyang 110004,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]辽宁工程技术大学创新实践学院,辽宁阜新123000 [3]辽宁省有色地质一○三队有限责任公司,辽宁丹东118008 [4]中国建筑材料工业地质勘查中心辽宁总队,沈阳110004

出　　处：《吉林大学学报(地球科学版)》2025年第1期188-198,共11页Journal of Jilin University:Earth Science Edition

基　　金：国家自然科学基金项目(51704139);中国科协青年托举工程项目(2023QNRC001);辽宁省教育厅基本科研项目(青年项目)(JYTQN2023212);辽宁省经济社会发展研究课题(2024lslqnrckt-017,2024lslybwzzkt-002)。

摘　　要：为合理确定大理岩在水化-冻融耦合作用下的蠕变长期强度σ_(s),以鄂西北地区某露天边坡为研究背景,以酸、中、碱三种溶液环境和不同冻融循环次数为试验控制因素,首先开展了大理岩单轴压缩试验和单轴压缩蠕变试验,然后采用过渡蠕变法、等时应力-应变曲线簇法、稳态蠕变速率-应力关系法、强度-破坏时间关系法求取了大理石长期强度,最后提出了两种新方法——基于应力-应变曲线的长期强度预测方法和改进的稳态蠕变速率-应力关系法,并对各方法进行了对比。结果表明:1)在同一冻融循环次数下,酸性环境下的瞬时强度和长期强度均最小,碱性次之,中性最大。2)采用过渡蠕变法、等时应力-应变曲线簇法、稳态蠕变速率-应力关系法、基于应力-应变曲线的长期强度预测方法、改进的稳态蠕变速率-应力关系法得到研究区大理岩在不同溶液环境和冻融循环次数下的长期强度平均值分别为46.70、41.21、39.74、43.92、43.67 MPa。3)本文提出的基于应力-应变曲线的长期强度预测方法无需开展耗时较长的蠕变试验,仅通过压缩试验确定的应力-应变曲线便可快速预测岩石长期强度;改进的稳态蠕变速率-应力关系法相比传统方法,杜绝了取拐点方式的较强主观性。In order to reasonably determine the creep long-term strength σ_(s) of marble under the coupling effect of hydration freeze-thaw,uniaxial compression tests and uniaxial compression creep test were carried out with three solution environments of acid,medium and alkali and different freeze-thaw cycles as the experimental control factors in an open-pit slope in northwest Hubei Province.Then,the long-term strength of marble was compared and analyzed by combining transition creep method,isothermal stress-strain curve cluster method,steady-state creep rate stress relationship method,strength failure time relationship method,and two new methods(long-term strength prediction method based on stress-strain curve and improved steady-state creep rate stress relationship method).The results show as follows:1)under the same number of freeze-thaw cycles,the instantaneous and long-term strength under acidic environment is the smallest,followed by alkaline environment,and the neutral environment is the largest.2)By using transition creep method,isothermal stress-strain curve cluster method,steady-state creep rate stress relationship method,long-term strength prediction method based on stress-strain curve,and improved steady-state creep rate stress relationship method,the average long-term strength values of the marble under different solution environments and freeze-thaw cycles is 46.70,41.21,39.74,43.92 and 43.67 MPa,respectively.3)The long-term strength prediction method based on stress-strain curve does not require time-consuming creep test,and can quickly predict the long-term strength of rocks based solely on the stress-strain curve determined by compression tests.Compared with traditional methods,the improved steady-state creep rate stress relationship method eliminates the strong subjectivity of taking inflection points.

关 键 词：水化-冻融 大理岩 蠕变 长期强度 瞬时强度 单轴压缩试验 单轴压缩蠕变试验 

分 类 号：TU452[建筑科学—岩土工程]