离心机模拟中渗流相似率的试验验证  

Modelling seepage flow velocity in centrifuge models

作　　者：王秋生[1,2] 陈祖煜[3] 隋海宾[4] 侯瑜京[3] 梁建辉[3] 

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124 [3]中国水利水电科学研究院,北京100048 [4]黄河勘测规划设计有限公司,河南郑州450003

出　　处：《岩土工程学报》2011年第8期1235-1239,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家重点基础研究发展规划"973"项目(2007CB714102);国家自然科学基金资助项目(50779073)

摘　　要：结合黏性土的压缩特性和Kozeny-Carman方程,考虑离心加速度变化对土体固有渗透率的影响,推导了渗流速度和离心加速度的关系式。参考常规渗流试验装置的构造,并结合离心模型试验的特点,研制了常水头离心渗流试验装置。应用该装置针对糯扎渡高心墙堆石坝的心墙黏土,分别进行了常规渗流试验和10g,20g,30g常水头离心渗流试验。试验结果表明:Ng(N倍重力加速度)和1g条件下渗透系数的比值随离心加速度的增大逐渐减小,但变化范围不大,接近于N。研究结果对于深入认识离心模型试验中的渗流相似准则具有重要意义。Based on the characteristics of clay compression and the Kozeny-Carman equation,the relation between seepage flow velocity and centrifugal accelerations is deduced considering the change of intrinsic permeability.An apparatus for constant head seepage tests is developed considering the set-up of conventional seepage test apparatus and the characteristics of centrifugal model tests.A series of seepage tests（1g,10g,20g,30g） are performed on Nuozhadu core-wall clay by means of the apparatus.It is concluded that the ratio of Ng and 1g hydraulic conductivity decreases with the increase of centrifugal acceleration,but the variation is small and the ratio is close to N.The research results are important for understanding the scaling of seepage flow velocity in centrifuge models.

关 键 词：离心模型试验 渗流 相似准则 渗透系数 固有渗透率 

分 类 号：TU411[建筑科学—岩土工程]