复杂地下水环境下石膏岩溶蚀特性分析  

Analysis of Gypsum Karst Erosion Characteristics in Complex Groundwater Environment

作　　者：何潇 周建伟 彭鑫 He Xiao;Zhou Jianwei;Peng Xin(Chengdu Surveying Geotechnical Research Institute,Chengdu 610023,China)

机构地区：[1]中冶成都勘察研究总院,成都610023

出　　处：《黑龙江科学》2025年第2期84-86,91,共4页Heilongjiang Science

基　　金：四川省科技计划资助项目(四川省自然科学基金2023NSFSC0787);中冶成都勘察研究总院资助项目(ZYCK2022-B001)。

摘　　要：为分析复杂地下水环境中的石膏岩溶蚀特性,采用干湿循环装置,通过干湿循环模拟地下水流动环境,以水流速度为变量,对直径45 mm、高度120 mm的圆柱体石膏岩试样干湿循环处理5 d,对比水流速度0 L/h、5 L/h、10 L/h、15 L/h下的石膏岩密度及成分变化。结果表明,石膏岩密度随地下水流速的增加而降低,完整度也逐渐降低,成分逐渐减少,说明水流速度对石膏岩溶蚀具有重要影响,随着水流速度的增加,石膏岩溶蚀速率逐渐增加,尤其是在10~15 L/h阶段石膏岩溶蚀速率大幅度提升,在静水或低流速环境中化学溶蚀是主要的溶蚀机制,在高流速环境中机械侵蚀作用显著增强,与化学溶蚀共同作用促进岩石的溶蚀。In order to analyze the characteristics of gypsum karst erosion in complex groundwater environment,the study simulates the groundwater flow environment through dry and wet cycle with a dry and wet cycle device.With water velocity as variable,a cylindrical gypsum rock sample with a diameter of 45 mm and a height of 120 mm is cycled through dry and wet treatment for 5 days,and the density and composition changes of gypsum rock are compared under water velocity of 0 L/h,5 L/h,10 L/h and 15 L/h.The results show that the density of gypsum rock decreases with the increase of groundwater velocity,and the integrity and composition of gypsum rock decrease gradually,indicating that the water velocity has an important effect on the karst erosion of gypsum.With the increase of water velocity,the karst erosion rate of gypsum increases gradually,especially at the stage of 10~15 L/h.Chemical corrosion is the main corrosion mechanism in still water or low flow rate environment,while mechanical erosion enhances significantly in high flow rate environment.It works with chemical corrosion to promote rock dissolution.

关 键 词：复杂地下水环境 石膏岩 溶蚀特性 水流速度 溶蚀速率 机械侵蚀 

分 类 号：O416.1[理学—理论物理]