围压和渗压加卸载作用下石灰岩裂隙渗流特性试验研究

    甘磊, 金洪杰, 沈振中, 徐磊, 马洪影

    甘磊, 金洪杰, 沈振中, 徐磊, 马洪影. 围压和渗压加卸载作用下石灰岩裂隙渗流特性试验研究[J]. 岩土工程学报, 2023, 45(10): 2062-2071. DOI: 10.11779/CJGE20220910
    引用本文: 甘磊, 金洪杰, 沈振中, 徐磊, 马洪影. 围压和渗压加卸载作用下石灰岩裂隙渗流特性试验研究[J]. 岩土工程学报, 2023, 45(10): 2062-2071. DOI: 10.11779/CJGE20220910
    GAN Lei, JIN Hongjie, SHEN Zhenzhong, XU LEI, MA Hongying. Experimental study on seepage characteristics of rough fracture of limestone under loading-unloading of confining and osmotic pressures[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(10): 2062-2071. DOI: 10.11779/CJGE20220910
    Citation: GAN Lei, JIN Hongjie, SHEN Zhenzhong, XU LEI, MA Hongying. Experimental study on seepage characteristics of rough fracture of limestone under loading-unloading of confining and osmotic pressures[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(10): 2062-2071. DOI: 10.11779/CJGE20220910

    围压和渗压加卸载作用下石灰岩裂隙渗流特性试验研究  English Version

    基金项目: 

    国家自然科学基金项目 52179130

    国家自然科学基金项目 51609073

    江苏省自然科学基金项目 BK20201312

    水利部堤防安全与病害防治工程技术研究中心项目 DFZX2020003

    详细信息
      作者简介:

      甘磊(1987—),男,博士,教授,主要从事工程渗流分析方面的教研工作。E-mail:ganlei2015@hhu.edu.cn

      通讯作者:

      沈振中, E-mail: zhzhshen@hhu.edu.cn

    • 中图分类号: TU452

    Experimental study on seepage characteristics of rough fracture of limestone under loading-unloading of confining and osmotic pressures

    • 摘要: 裂隙面粗糙程度和加卸载环境对裂隙渗流特性的影响不可忽视。为研究不同裂隙面节理粗糙度系数(JRC)和围压、渗透压力(渗压)加卸载对石灰岩粗糙单裂隙渗流演化规律的影响,制备5组不同JRC石灰岩单裂隙试样,利用自研岩体裂隙渗流试验系统,开展了不同JRC裂隙试样在围压、渗压加卸载作用下的渗流试验研究。结果表明:不同JRC裂隙试样的渗流量和渗透率随围压增大而减小,加载时各试样渗透率均与围压呈幂函数关系,R2最小为0.9583,围压卸荷时存在明显滞回效应,卸载时JRC对滞回程度影响较大,与下降量和回升量呈对数关系;渗压加卸载过程,裂隙渗流量变化同渗压正相关,渗透率持续下降;一次渗压加卸载循环后的裂隙渗流量下降值与JRC相关性良好,提出了渗压加卸载后的裂隙渗流量预测模型。
      Abstract: The influences of the roughness of fracture surface and the loading-unloading environment on seepage characteristics of fracture cannot be ignored. To study the influences of the fracture surface with different joint roughness coefficients (JRC) and loading-unloading of confining and osmotic pressures on the seepage evolution laws of rough single fracture of limestone, five groups of limestone samples with a single fracture with different JRCs are prepared. The self-developed seepage test system for the fractured rock mass is used to conduct a seepage test of the fractured samples with different JRCs under loading-unloading of confining and osmotic pressures. The results show that the seepage flow and permeability of different fractured samples decrease with the increase of the confining pressure, and the permeability of each sample has a power function relationship with the confining pressure, with the minimum R2 of 0.9583. There is an obvious hysteretic effect during the unloading of the confining pressure. The JRC has a great influence on the hysteretic degree during unloading, which is logarithmic with the decline and recovery. During the process of loading-unloading of pressure, the change of seepage flow through the single fracture is positively correlated with the osmotic pressure, while the permeability decreases continuously. There is a good correlation between the decreased value of seepage flow through the single fracture and the JRC after a cycle of loading-unloading of pressure. A prediction model for seepage flow of fracture after loading-unloading of osmotic pressure is proposed.
    • 图  1   不同JRC的裂隙面数字化图像

      Figure  1.   Digital images of fracture surfaces with different JRCs

      图  2   制备阶段的试样形态图

      Figure  2.   Shapes of samples during preparation process

      图  3   试验系统主要装置图

      Figure  3.   Diagram of main device of test system

      图  4   渗流量随围压变化曲线

      Figure  4.   Curves of seepage flow with confining pressure

      图  5   渗透率与围压变化曲线

      Figure  5.   Curves of permeability and confining pressure

      图  6   渗透率与围压Pa的拟合关系曲线

      Figure  6.   Fitting curves between permeability and confining pressure

      图  7   试验参数ab与JRC的拟合关系曲线

      Figure  7.   Fitting curves of test parameters a, b and JRC

      图  8   klkf随JRC变化的关系曲线

      Figure  8.   Curves of kl and kf with JRC

      图  9   裂隙渗流量随渗压加卸载变化曲线

      Figure  9.   Curves of seepage flow of fracture with loading and unloading of seepage pressure

      图  10   JRC与渗流量下降量拟合关系

      Figure  10.   Fitting relationship between JRC and decrease of seepage discharge

      图  11   JRC与初始渗流量的拟合关系

      Figure  11.   Fitting relationship between JRC and initial seepage rate

      图  12   裂隙渗透率随渗压加卸载变化曲线

      Figure  12.   Curves of fracture permeability with seepage pressure under loading and unloading conditions

      图  13   试验前后试样裂隙(JRC = 11.40)形貌特征图

      Figure  13.   Characteristics of morphologies of fracture surface of samples with JRC of 11.40 before and after tests

      表  1   石灰岩物理性质

      Table  1   Physical properties of limestone

      物理量 计量单位 平均值
      密度 g/cm3 2.70
      吸水率 % 0.21
      抗压强度 MPa 87.50
      抗拉强度 MPa 8.20
      抗弯强度 MPa 9.11
      下载: 导出CSV

      表  2   不同加卸载条件下渗流试验方案

      Table  2   Schemes of seepage test under different loading and unloading conditions

      试样编号 JRC 围压/MPa 渗压/MPa 加载速率/(MPa·s-1)
      M-1 2.64 2,3,4,6,8,10,8,6,4,3,2 0.5 0.005
      M-2 7.78
      M-3 11.40
      M-4 15.47
      M-5 19.51
      H-1 2.64 3 0.2,0.5,0.8,1.0,1.2,1.5,1.2,1.0,0.8,0.5,0.2 0.001
      H-2 7.78
      H-3 11.40
      H-4 15.47
      H-5 19.51
      下载: 导出CSV
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    出版历程
    • 收稿日期:  2022-07-21
    • 网络出版日期:  2023-10-16
    • 刊出日期:  2023-09-30

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