摘要
为分析老挝东泰钾盐矿区开发过程中遇到的地下水渗漏问题,采用岩土渗流-侵蚀-应力耦合试验装置,对采自矿区的岩盐原样进行压力-溶解耦合作用下的渗透特性演变规律试验。试验结果表明:岩盐试样的平均渗流速度随着水力梯度的增大先减小后增大;岩盐试样的渗透系数随着水力梯度的增大先快速减小,然后缓慢增大,最后逐渐趋于稳定的趋势;岩盐渗透特性的演化规律受到溶解作用和围压作用的共同影响,溶解作用促进渗流通道的形成,增强岩盐试样的渗透性,而围压作用则使渗流通道趋于闭合,降低岩盐试样的渗透性,这是一个相互促进、相互抑制的过程;溶解作用会促使岩盐试样内部进一步向不均匀的集中渗流通道发展,深刻影响岩盐的渗透特性的演变规律。
To analyze the seepage problem of groundwater during the development of potash salt mining area in Dongtai,Laos,a geotechnical seepage-erosion-stress coupling experimental device was used to study the permeability evolution of the rock salt collected from the mining area under pressure-dissolution coupling effect.The experimental results indicate that the average seepage velocity of the rock salt samples decreases first and then increases with the increase of hydraulic gradient during the experiment.The permeability coefficient of the rock salt samples decreases rapidly with the increase of hydraulic gradient at first,then increases slowly and finally tends to be stable.The permeability evolution of the rock salt is affected by both dissolution and confining pressure.The dissolution promotes the formation of seepage channels and enhances the permeability of the rock salt sample.The confining pressure makes the seepage channel close and reduces the permeability of the rock salt sample.It is a process of mutual promotion and mutual inhibition.Dissolution can promote the development of inhomogeneous concentrated seepage channels interior of the rock salt specimen,profoundly affecting the permeability evolution of the rock salt.
作者
盛金昌
王珂
袁小龙
刘艺召
罗玉龙
詹美礼
SHENG Jinchang;WANG Ke;YUAN Xiaolong;LIU Yizhao;LUO Yulong;ZHANG Meili(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China;China Water Resources Beifang Investigation,Design and Research Co.,Ltd.,Tianjin 300222,China)
出处
《水利水电科技进展》
CSCD
北大核心
2018年第6期44-48,共5页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金(51579078
51474204
51679070)
关键词
岩盐
渗透特性
压力溶解耦合作用
渗透系数
水力梯度
rock salt
permeability characteristic
pressure-dissolution coupling effect
permeability coefficient
hydraulic gradient
