摘要
强酸性废水对碳酸盐岩有很强的腐蚀性,可以导致碳酸盐岩的物理力学性质发生重大改变。为了研究酸性淋滤液对碳酸盐岩的溶蚀损伤和力学损伤,通过开展不同流速条件下,不同时长磷石膏酸性淋滤液对灰岩的溶蚀试验研究,分析了试验前后岩样的表观特征、质量、孔隙度、单轴抗压强度以及声发射计数等指标的变化规律,揭示了酸性淋滤液对碳酸盐岩物理力学特性的影响。试验结果表明:岩样的溶蚀率、孔隙度增量与溶蚀时间及淋滤液流速均成正相关关系,力学强度与溶蚀时间及淋滤液流速均成负相关关系。随着溶蚀的进行,岩样表面会附着越来越厚的萤石矿物,使得岩样的溶蚀速率变慢。单轴试样的破坏形式由剪切破坏向张拉破坏逐渐转变。在磷石膏淋滤液溶蚀的酸性环境下,灰岩内部矿物成分被溶解,从而引起宏观力学参数的变化。研究结果可为酸性废水影响条件下岩溶介质稳定性分析、酸性废水处理、尾矿工程安全设计等方面提供理论与试验数据依据。
Strongly acidic wastewater exhibits significant corrosivity toward carbonate rocks,inducing substantial alterations in their physical and mechanical properties.[Objective]This study investigates the dissolution and mechanical degradation of carbonate rocks under the influence of acidic leachate.[Methods]Limestone samples are subjected to acidic leachate under varying flow conditions and durations.The dissolution effects are evaluated through comprehensive analyses of apparent characteristics,mass loss,porosity,uniaxial compressive strength,acoustic emission activity,and other key indicators.These measurements elucidate the impact of the acidic leachate on the physical and mechanical properties of carbonate rocks.[Results]Experimental results demonstrate that the dissolution rate and porosity of the rock samples increase with prolonged exposure time and higher flow rates,whereas the mechanical strength exhibits a corresponding decline.As dissolution progresses,the formation of increasingly thicker fluorite mineral layers on the rock surfaces is observed,which subsequently attenuates the dissolution rate.Furthermore,the failure mode of uniaxial samples shifts from shear-dominated to tensile-dominated damage.The acidic environment of phosphogypsum leachate induces the dissolution of internal minerals within limestone,resulting in significant changes to macromechanical properties.[Conclusion]These findings provide critical theoretical and experimental insights for assessing the stability of karst media under acidic wastewater conditions,as well as for optimizing the safety design of acidic wastewater treatment and tailings management systems.
作者
宗劭康
褚学伟
张佳欣
梁柱
杨凤竹
ZONG Shaokang;CHU Xuewei;ZHANG Jiaxin;LIANG Zhu;YANG Fengzhu(College of Resource and Environmental Engineering,Ministry of Education,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Geological Resources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,China)
出处
《地质科技通报》
2025年第5期225-233,共9页
Bulletin of Geological Science and Technology
基金
国家自然科学基金项目(42062016)。
关键词
灰岩
酸性溶蚀
溶蚀率
力学损伤
声发射
碳酸盐岩
酸性淋滤液
limestone
acidic dissolution
dissolution rate
mechanical damage
acoustic emission
carbonate rock
acidic leache
作者简介
第一作者:宗劭康,E-mail:z13930715698@126.com;通信作者:褚学伟,E-mail:28409807@qq.com。
