摘要
为研究在化学腐蚀和冻融循环复合作用下岩石的能量演化规律,以大理岩为研究对象,分析冻融腐蚀岩样能量演化过程,建立与强度衰减参数、pH、冻融次数相关的能量耗散模型,以期为长期服役岩石力学工程安全稳定性评价提供理论支持。研究结果表明:化学腐蚀冻融复合作用下,腐蚀孔隙为水增加了入渗通道,冻胀裂隙同时也为腐蚀溶液提供了贯穿的通道,加剧了岩石内部结构的崩解与裂隙扩展贯通;相同冻融循环次数下,HNO_(3)溶液中的腐蚀岩石弹性模量降幅最高,NaCl溶液次之,NaOH溶液最低;腐蚀岩石弹性应变能的吸收和耗散能的释放,随着冻融循环次数的增大而减小;建立的能量耗散模型对于岩石峰后阶段耗散能具有较高的准确性,能较好地模拟岩石峰后能量转化特征。
In order to study the energy evolution law of rock under the combined action of chemical corrosion and freeze-thaw cycle,taking marble as the research object,the energy evolution process of freeze-thaw corrosion rock samples was analyzed.The energy dissipation models related to the strength attenuation parameters,pH and freeze-thaw cycles were established to provide theoretical support for the safety and stability evaluation of rock mechanics engineering in long-term service.The results showed that under the combined action of chemical corrosion and freeze-thaw,the corrosion pores increased the infiltration channel for water,and the frost heaving cracks also provided a penetrating channel for the corrosion solution,which aggravated the disintegration of the internal structure of rock and the fracture propagation.Under the same freeze-thaw cycles,the decrease in the elastic modulus of corroded rock in HNO_(3) solution was the highest,followed by NaCl solution,and NaOH solution was the lowest.The absorption of elastic strain energy and release of dissipated energy of corroded rock decreased with the increase of freeze-thaw cycles.The established energy dissipation model had high accuracy for the dissipation energy of rock in after peak stage,and it could better simulate the energy conversion characteristics of rock after peak.
作者
张淑坤
王来贵
唐楠楠
ZHANG Shukun;WANG Laigui;TANG Nannan(School of City and Architecture Engineering,Zaozhuang University,Zaozhuang Shandong 277160,China;School of Mechanics and Engineering,Liaoning Technical University,Fuxin Liaoning 123000,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2022年第6期148-154,共7页
Journal of Safety Science and Technology
基金
国家自然科学基金青年基金项目(51704143)
辽宁省自然科学基金项目(2020-MS-302)。
关键词
化学腐蚀
冻融循环
岩石
能量耗散模型
chemical corrosion
freeze-thaw cycle
rock
energy dissipation model
