利用RQD估算岩体不同深度的平均渗透系数和平均变形模量  

Estimation of depth-dependent hydraulic conductivity and deformation modulus using RQD

作　　者：蒋小伟[1] 万力[1] 王旭升[1] 武雄[1] 程惠红[1] 

机构地区：[1]中国地质大学水资源与环境学院,北京100083

出　　处：《岩土力学》2009年第10期3163-3167,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.50639090;No.40528003)资助

摘　　要：渗透系数是进行裂隙岩体渗流模拟的必备参数,变形模量是工程岩体数值模拟的必备参数。大量研究中忽视了渗透系数和变形模量随深度变化这一重要规律,从而影响模拟结果的可靠性。为此,探讨了利用极易获取的RQD(岩石质量指标)资料估算不同深度的渗透系数和变形模量的可行性。通过以某花岗岩体为例,研究发现,RQD均值随深度增大,渗透系数均值随深度减小,其相关性很好。因此,利用RQD估算不同深度的平均渗透系数是可行的。根据RQD随深度的变化,利用经验公式估算了不同深度的变形模量均值和变化范围。估算得到的变形模量与实测结果基本一致。Hydraulic conductivity is indispensable for groundwater modeling in fractured rock masses while deformation modulus is required for stability evaluation of rock masses. Unfortunately, the variations in hydraulic conductivity and deformation modulus with depth are usually ignored, which would lead to inaccurate results. The feasibility of estimating hydraulic conductivity and deformation modulus using the rock quality design （RQD） at different depths is discussed. In a granite rock mass, it is found out that the mean RQD would increase with depth, while the mean hydraulic conductivity would decrease with depth. Moreover, there is a high correlation between mean RQD and mean hydraulic conductivity. Therefore, it is practical to estimate depth-dependent hydraulic conductivity using RQD data. Furthermore, based on empirical equations, the deformation modulus is successfully estimated using the variations in mean RQD with depth.

关 键 词：RQD 渗透系数 变形模量 深度 

分 类 号：TU443[建筑科学—岩土工程]