干湿循环作用下裂隙岩体渗流特性演化规律研究
Seepage characteristics of fractured rock mass under dry-wet cycling action
施炎 1王团乐 1宛良朋 2孙旭曙 3左小鹏 3郭晓萍3
作者信息
- 1. 长江三峡勘测研究院有限公司(武汉),湖北 武汉 430074
- 2. 中国三峡建工集团有限公司,四川 成都 610041
- 3. 三峡大学 三峡库区地质灾害教育部重点实验室,湖北 宜昌 443002
- 折叠
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.
Abstract
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 fis-sure 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 coeffi-cient and permeability tensor decreased,the radius of permeability ellipse increased,and the principal permeability direction re-mains unchanged after water-rock interaction.
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Key words
fractured rock/seepage characteristics/seepage flow/anisotropy/permeability ellipse/dry-wet cycling/wud-ongde Reservoir area引用本文复制引用
基金项目
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)
出版年
2024
国家科技期刊平台
NSTL
万方数据