Development of a shear-flow test apparatus and determination of coupled properties for a single rock joint
Development of a shear-flow test apparatus and determination of coupled properties for a single rock joint
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DOI：
10.1016/s0148-9062(99)00044-3
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发表时间：
1999-07-01
影响因子：
7.2
通讯作者：
Jing, L
中科院分区：
文献类型：
--
作者：
Esaki, T;Du, S;Jing, L
提出了一种新的岩石节理剪切-渗流耦合试验技术，并利用该技术研究了节理剪切变形和裂隙水动力对岩石节理渗透系数的耦合影响。这种技术被用来进行耦合剪切流试验与人工创建的花岗岩联合样本下恒定的法向载荷和残余剪切变形20毫米。水力传导率估计通过使用有限差分法和近似方程假设立方定律。剪切流试验结果表明，渗透系数的变化与接头的渗透性变化基本相似。水力传导率迅速增加，对于第一个5 mm的剪切位移，增加约1.2-1.6个数量级。在通过残余剪应力后，随着剪切位移的增加，渗透系数逐渐趋于一个恒定值。另一方面，剪切后的导水率比剪切前大一个数量级左右。在初始剪切过程中，试验得到的剪切-流动耦合特性与巴顿模型预测的趋势一致。然而，增加岩石节理样品的实测和预测的水力传导率之间的偏差已观察到增加剪切位移。(C)1999 Elsevier Science Ltd.保留所有权利。
A new laboratory technique for coupled shear-flow tests of rock joints was developed and used to investigate the coupled effect of joint shear deformation and dilatancy on hydraulic conductivity of rock joints. This technique was used to carry out coupled shear-flow tests with an artificial created granite joint sample under constant normal loads and up to residual shear deformations of 20 mm. The hydraulic conductivity was estimated by using a finite difference method and an approximate equation assuming the cubic law. The shear-flow testing results revealed that the change of hydraulic conductivity is approximately similar to that of the dilatancy of a joint. The hydraulic conductivity increases rapidly, by about 1.2-1.6 orders of magnitude for the first 5 mm of shear displacement. After passing the residual shear stress, the hydraulic conductivity becomes gradually a constant value with increasing shear displacement. On the other hand, the hydraulic conductivity after shearing is about one order of magnitude larger than that prior to shearing. Shear-flow coupling characteristics obtained from these tests have a consistent trend with Barton's model prediction during the initial shear process. However, increasing deviation between measured and predicted hydraulic conductivity of rock joint samples has been observed with increasing shear displacement. (C) 1999 Elsevier Science Ltd. All rights reserved.