摘要
为了研究水库消落带岩体的渗流特性,以乌东德库区白云岩为研究对象,开展干湿循环水-岩作用试验。基于单裂隙渗流试验研究了干湿循环作用下裂隙岩体渗流特性演化规律,采用理论分析方法研究了裂隙岩体各向异性渗透特性。研究结果表明:当围压恒定时,单裂隙渗流量随渗透水压力的增加线性增加;当渗透水压力恒定时,随着围压的增加渗流量呈指数函数关系递减;随着水-岩作用周期的增加,裂隙渗流量呈先骤减小后缓慢增大的变化规律。裂隙岩体渗透特性存在明显的各向异性特征,并且水-岩作用后主渗透系数和渗透张量减小,渗透椭圆半径增加,渗透主方向保持不变。
In order to study the seepage characteristics of fractured rock mass in the water-level fluctuation zone of reservoirs,the dry-wet cycling water-rock interaction test was carried out on dolomite in Wudongde Reservoir area.Based on the single fissure seepage test,the evolution law of seepage characteristics of fractured rock mass under the action of dry-wet cycling was studied,and the anisotropic seepage characteristics of fractured rock mass were studied by theoretical analysis method.The results showed that when the confining pressure was constant,the seepage flow of single crack increased linearly with the increase of seepage water pressure.When the seepage water pressure was constant,the seepage flow decreased exponentially with the increase of confining pressure.With the increasing of water-rock interaction period,the fracture seepage flow decreased suddenly and then slowly increased.The permeability characteristics of fractured rock mass had obvious anisotropy,the principal permeability coefficient and permeability tensor decreased,the radius of permeability ellipse increased,and the principal permeability direction remains unchanged after water-rock interaction.
作者
施炎
王团乐
宛良朋
孙旭曙
左小鹏
郭晓萍
SHI Yan;WANG Tuanle;WAN Liangpeng;SUN Xushu;ZUO Xiaopeng;GUO Xiaoping(Three Gorges Survey and Research Institute Co.,Ltd.,Wuhan 430074,China;China Three Gorges Construction Group Co.,Ltd.,Chengdu 610041,China;Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of MoE,China Three Gorges University,Yichang 443002,China)
出处
《人民长江》
北大核心
2024年第7期198-203,共6页
Yangtze River
基金
中国三峡建工(集团)有限公司科研项目(WDD/0569)
国家自然科学基金联合基金项目(U2034203)
国家自然科学基金青年基金项目(52009067)。
关键词
裂隙岩体
渗流特性
渗流量
各向异性
渗透椭圆
干湿循环
乌东德库区
fractured rock
seepage characteristics
seepage flow
anisotropy
permeability ellipse
dry-wet cycling
wudongde Reservoir area
