| 低应力下岩石裂隙水力特性 |
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| 引用本文： | 刘才华,陈从新,冯夏庭,杨春和,付少兰.低应力下岩石裂隙水力特性[J].岩土力学,2004,25(8):1191-1194. |
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| 作者姓名： | 刘才华 陈从新 冯夏庭 杨春和 付少兰 |
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| 作者单位： | Geo-environmental Engineering Key Laboratory, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| 基金项目： | 国家自然科学重点基金(No.50239070)，国家重点基础研究发展规划项目(No.2002CB412704)，中国科学院岩土力学研究所领域前言基金项目(No.110217)。 |
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| 摘 要： | 针对地表附近30～50 m的岩体裂隙处于一种低围压状态（约1 MPa左右）这一情况，提出了低应力状态下裂隙变形的两点假设：（1）裂隙面处于线弹性状态；（2）隙宽减小量相对于初始力学隙宽是一个微小量。结合Barton公式，建立了低法向应力下裂隙渗流的半经验理论公式，并从实验的角度验证了该公式的合理性。实验结果和理论分析表明：低法向应力作用下，裂隙渗透系数随法向应力的增加而线性降低。此外，给出了一种间接确定裂隙初始力学隙宽的方法。
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| 关 键 词： | 法向应力 岩石裂隙 水力特性 |
| 文章编号： | 1000-7598-(2004)08-1191-04 |
| 收稿时间： | 2003-01-05 |
| 修稿时间： | 2003年1月5日 |
A study on hydraulic properties of a single rock joint under lower normal stresses |
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| LIU Cai-hua,CHEN Cong-xin,FENG Xia-ting,YANG Chun-he,FU Shao-lan.A study on hydraulic properties of a single rock joint under lower normal stresses[J].Rock and Soil Mechanics,2004,25(8):1191-1194. |
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| Authors: | LIU Cai-hua CHEN Cong-xin FENG Xia-ting YANG Chun-he FU Shao-lan |
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| Institution: | Geo-environmental Engineering Key Laboratory, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | Rock joints of 30—50 m away from the earth surface are under lower confining pressure which is about 1 MPa. So it is of actual significance to investigate the flow properties of rock joints under lower pressure. Two hypotheses for rock joint deformation under lower pressure are put forward, of which one is that rock joint is linear elastic, and another is that aperture decrement is much smaller than the initial mechanical aperture. With these hypotheses, a semi-empirical theoretical formula for rock joint under lower normal stresses is developed using Barton’s equation. Experimental tests of marble joints are performed; and the results are consistent with the formula. It is shown that the hypotheses are reasonable, and that hydraulic conductivity linearly decreases with normal stress increasing. Furthermore, an indirect method for measuring initial mechanical aperture is given. |
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| Keywords: | normal stress rock joint hydraulic characteristics |
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