循环加卸载作用下砂岩孔隙度与渗透率演化规律试验研究

孔茜; 王环玲; 徐卫亚

doi:10.11779/CJGE201510018

循环加卸载作用下砂岩孔隙度与渗透率演化规律试验研究 English Version

1. 河海大学水利水电学院，江苏南京 210098;
2. 河海大学港口海岸与近海工程学院，江苏南京 210098;
3. 河海大学岩土工程科学研究所，江苏南京 210098

基金项目: 国家自然科学基金项目（11172090,11272113,11572110）; 江苏省自然科学基金项目(BK2012809)

详细信息

作者简介:
孔茜（1990- ），女，硕士研究生，从事岩石力学与工程研究。E-mail: kongqian1990@163.com。

中图分类号: A
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出版历程
- 收稿日期: 2014-10-27
- 发布日期: 2015-10-19

Experimental study on permeability and porosity evolution of sandstone under cyclic loading and unloading

1. Hydraulic and Hydro-Power Engineering, Hohai University, Nanjing 210098, China;
2. Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China;
3. Geotechnical Research Institute, Hohai University, Nanjing 210098, China

摘要

摘要: 研究砂岩在多次循环荷载作用下孔隙度及渗透率随荷载的变化规律，利用致密岩石惰性气体渗透率测试系统对砂岩进行了5次循环加卸载试验。试验结果表明：砂岩的孔隙度和渗透率随围压的增大而减小，循环加卸载过程中，砂岩的孔隙度、渗透率在加载阶段与卸载阶段的变化曲线均是不重合的。围压加载阶段孔隙度和渗透率随围压的变化关系均呈指数关系，在围压卸载阶段孔隙度与渗透率随围压变化均呈幂函数关系。砂岩在低围压条件下渗透率随围压变化的程度较大，在高围压条件下渗透率变化程度较小。加载阶段砂岩渗透率变化程度在第1次循环期间较大，从第2次循环开始由于岩样一定程度的压密渗透率随围压变化越来越小，而卸载阶段5次循环过程中渗透率随围压的减小而增大，但是循环次数增加过程中，渗透率的恢复程度相对于第一次循环越来越小。
- 循环加卸载 /
- 孔隙度 /
- 渗透率 /
- 围压 /
- 砂岩
Abstract: In order to investigate the evolution of porosity and permeability of sandstone during the cyclic loading and unloading, the cyclic loading and unloading tests on sandstone are carried out by using the test system of gas permeability measurement for compact rock. The test results show that the porosity and permeability of sandstone decrease with the increasing confining pressure. The permeability and porosity curve in the process of loading does not overlap that in the unloading process. In the process of loading, the relationship among porosity, permeability and confining pressure can be well described by an exponential function, and it can be well described by a power function in the process of unloading. The permeability changes faster under low confining pressure than that under high confining pressure. The permeability changes much more largely in the first cyclic loading, and from the second cyclic loading, due to the pre-compaction, the permeability changes with the decreasing confining pressure. But in the process of unloading, the permeability gradually increases with the decreasing confining pressure in the fifth cycles, and compared to that of the first cycle, the recovery of permeability is much smaller with the increase of cycles.
- cyclic loading and unloading /
- porosity /
- permeability /
- confining pressure /
- sandstone

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参考文献(16)

[1]	Y┃LD┃R┃M H, ERSAN H. Settlements under consecutive serices of cyclic loding[J]. Soil Dynamics and Earthquake Engineering, 2007, 27(6): 577-55.
[2]	蔡袁强, 王军. 双向循环荷载作用下饱和软黏土动力特性研究[J]. 湖南大学学报, 2008, 35(11): 62-65. (CAI Yuan-qiang, WANG Jun. Study on dynamie behaviors of soft clay under bidireetional cyclic loading[J]. Journal of Hunan University, 2008, 35(11): 62-65. (in Chinese))
[3]	周建, 龚晓南. 循环荷载作用下饱和软黏土应变软化研究[J]. 土木工程学报, 2000, 33(5): 75-78, 82. (ZHOU Jian, GONG Xiao-nan. Study on strain softening in saturated soft clay under cyclic loading[J]. China Civil Engineering Journal, 2000, 33(5):75-78, 82. (in Chinese))
[4]	魏新江, 张涛, 丁智, 等. 循环荷载下不同固结度饱和软黏土刚度变化试验研究[J]. 岩土工程学报, 2013, 35(增刊2): 675-679. (WEI Xin-jiang, ZHANG Tao, DING Zhi, et al. Experimental study on stiffness change of saturated soft clay with different degrees of consolidation under cyclic loading[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(S2): 675-679. (in Chinese) )
[5]	赵闯, 武科, 李术才, 等. 循环荷载作用下岩石损伤变形与能量特征分析[J]. 岩土工程学报, 2013, 35(5): 890-896. (ZHAO Chuang, WU Ke, LI Shu-cai, et al. Energy characteristics and damage deformation of rock subjected to cyclic loading[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(5): 890-896. (in Chinese))
[6]	吴凡, 孙黎娟, 何江. 孔隙度、渗透率与净覆压的规律研究和应用[J]. 西南石油学院学报, 1999, 21(4): 23-25. (WU Fan, SUN Li-juan, HE Jiang. The research and application of permeability, porosity and net overburden pressure laws[J]. Journal of Southwest Petroleum Institute, 1999, 21(4): 23-25. (in Chinese))
[7]	刘建军, 刘先贵. 有效压力对低渗透多孔介质孔隙度、渗透率的影响[J]. 地质力学学报, 2001, 7(1): 41-44. (LIU Jian-jun, LIU Xian-gui. The effect of effective stress on porosity and permeability of the low permeability porous medium[J]. Journal of Geomechanics, 2001, 7(1): 41-44. (in Chinese))
[8]	彭苏萍, 孟召平, 王虎, 等. 不同围压下砂岩孔渗规律试验研究[J]. 岩石力学与工程学报, 2003, 22(5): 742-746. (PENG Su-ping, MENG Zhao-ping, WANG Hu, et al. Testing study on pore ratio and permeability of sandstone under different confining pressures[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(5): 742-746. (in Chinese))
[9]	WANG H L, XU W Y, ZUO J. Compact rock material gas permeability properties[J]. Physica B: Condensed Matter, 2014, 449: 10-18.
[10]	胡大伟, 周辉, 潘鹏志, 等. 砂岩三周循环加卸载条件下的渗透率研究[J]. 岩土力学, 2010, 31(9): 2749-2754. (HU Da-wei, ZHOU Hui, PAN Peng-zhi, et al. Study of permeability of sandstone in triaxial cyclic stress tests[J]. Rock and Soil Mechanics, 2010, 31(9): 2749-2754. (in Chinese))
[11]	贺玉龙, 杨立中. 围压升降过程中岩体渗透率变化特性的试验研究[J]. 岩石力学工程学报, 2004, 23(3): 415-419. (HE Yu-long, YANG Li-zhong. Testing study on variational characteristics of rockmass permeability under loading- unloading of confining pressure[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(3): 415-419. (in Chinese))
[12]	许江, 鲜学福, 王鸿, 等. 循环加、卸载条件下岩石类材料变形特性的试验研究[J]. 岩石力学工程学报, 2006, 25(1): 3040-3045. (XU Jiang, XIAN Xue-fu, WANG Hong, et al. Experimental study on rock deformation characteristics under cycling loading and unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(1): 3040-3045. (in Chinese))
[13]	陈运平, 王思敬. 多级循环荷载下饱和岩石的弹塑性影响[J]. 岩土力学, 2010, 31(4): 1030-1034. (CHEN Yun-ping, WANG Si-jing. Elastoplastic response of saturated rocks subjected to multilevel cyclic loading[J]. Rock and Soil Mechanics, 2010, 31(4): 1030-1034. (in Chinese))
[14]	代平, 孙良田, 李闽. 低渗透砂岩储层孔隙度、渗透率与有效应力关系研究[J]. 天然气工业, 2006, 26(5): 93-96. (DAI Ping, SUN Liang-tian, LI Min, et al. Study on relation between porosity/permeability and effective stress of sand reservoir with low permeability[J]. Natural Gas Industry, 2006, 26(5): 93-96. (in Chinese))
[15]	MCKEE C R, BUMB A C, KOENIG R A. Stress-dependent permeability and porosity of coal and other geologic formations[J]. SPE Formation Evaluation, 1988, 3(1): 81-91.
[16]	黄远智, 王恩志. 低渗透岩石渗透率对有效应力敏感系数的试验研究[J]. 岩石力学工程学报, 2007, 26(2): 410-414. (HUANG Yuan-zhi, WANG En-zhi. Experimental study on coefficient of sensitiveness between percolation rate and effective pressure for low permeability rock[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(2): 410-414. (in Chinese))