干湿循环作用对大理岩渗透性影响的试验研究
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摘要
本文以锦屏大理岩为研究对象,采用干湿循环处理,开展不同干湿循环次数和围压加卸载条件下大理岩气体渗透性试验,研究了大理岩渗透率随围压和干湿循环次数的变化规律.同时通过电镜扫描,探究了不同干湿循环作用对大理岩细观结构的影响效应,分析了干湿循环对大理岩的细观作用机理.试验结果表明:气体渗透性试验中,在相同围压下,大理岩渗透率随干湿循环次数的增加而递增,在同一干湿循环次数下,大理岩的渗透率随围压增大而减小;干湿循环次数越高,围压对渗透率的影响效应越显著;随着干湿循环次数增加,微裂纹不断扩展并相互搭接,大理岩块状构造逐步破碎化.
In order to study the permeability of Jinping marble after dry-wet cycling treatment,gas permeability tests under different dry-wet cycles with loading and unloading of confining pressure are carried out.Meanwhile,the effect of dry-wet cycling on the mesostructure of the marble are investigated by scanning electron microscopy(SEM);and the mesoscopic mechanism of wet-dry cycling on the marble is also analyzed.The results show that under the same confining pressure,the permeability of marble increases with the increase of the number of dry-wet cycles;and under the same number of dry-wet cycle,the permeability of marble decreases with the increase of confining pressure.The effect of confining pressure on permeability is significantly enhanced by dry-wet cycling.With the number of dry-wet cycle,the microcracks continue to expand and overlap,and the marble block structure gradually becomes fragmented.
In order to study the permeability of Jinping marble after dry-wet cycling treatment,gas permeability tests under different dry-wet cycles with loading and unloading of confining pressure are carried out.Meanwhile,the effect of dry-wet cycling on the mesostructure of the marble are investigated by scanning electron microscopy(SEM);and the mesoscopic mechanism of wet-dry cycling on the marble is also analyzed.The results show that under the same confining pressure,the permeability of marble increases with the increase of the number of dry-wet cycles;and under the same number of dry-wet cycle,the permeability of marble decreases with the increase of confining pressure.The effect of confining pressure on permeability is significantly enhanced by dry-wet cycling.With the number of dry-wet cycle,the microcracks continue to expand and overlap,and the marble block structure gradually becomes fragmented.
引文
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[13]常宗旭,赵阳升,胡耀青,等.裂隙岩体渗流与三维应力藕合的理论与实验研究[J].岩石力学与工程学报,2004,23(增2):4907-4911.
[14]王伟,龚传根,朱鹏辉,等.大理岩干湿循环力学特性试验研究[J].水利学报,2017,48(10):1175-1184.
[15]刘新荣,王子娟,傅晏,等.考虑干湿循环作用泥质砂岩的强度与破坏准则研究[J].岩土力学,2017,38(12):3395-3401.
[16]马芹永,郁培阳,袁璞.干湿循环对深部粉砂岩蠕变特性影响的试验研究[J].岩石力学与工程学报,2018,37(3):593-600.
[17]刘新荣,李栋梁,张梁,等.干湿循环对泥质砂岩力学特性及其微细观结构影响研究[J].岩土工程学报,2016,38(7):1291-1299.
[18]倪骁慧,李晓娟,朱珍德.不同温度循环作用后大理岩细观损伤特征的定量研究[J].煤炭学报,2011,36(2):248-254.
[19]巢志明,王环玲,徐卫亚,等.不同饱和度砂岩渗透率、孔隙度随应力变化规律研究[J].岩石力学与工程学报,2017,36(3):665-680.
[20]贾朝军,王环玲,徐卫亚,等.地下水封洞库围岩气体渗透特性及滑脱效应研究[J].工程力学,2015,32(8):50-57.
[2]王环玲,徐卫亚,左婧,等.低渗透岩石渗透率与孔隙率演化规律的气渗试验研究[J].水利学报,2015,46(2):208-215.
[3]黄远智,王恩志.低渗透岩石渗透率与有效围压关系的实验研[J].清华大学学报,2007,47(3):340-343.
[4]Olsen H W,Popp T.Darcy’s Law in Saturated Kaolinite[J].Water Resources Research,1966,2(6):287-295.
[5]Brace W F,Walsh J B,Frangos W T.Permeability of Granite under High Pressure[J].Journal of Geophysical Research,1968,73(6):2225-2236.
[6]李小春,高桥学,吴智深,等.瞬态压力脉冲法及其在岩石三轴试验中的应用[J].岩石力学与工程学报,2001,20(增1):1725-1733.
[7]王伟,徐卫亚,王如宾,等.低渗透岩石三轴压缩过程中的渗透性研究[J].岩石力学与工程学报,2015,34(1):40-47.
[8]曹亚军,王伟,徐卫亚,等.低渗透岩石流变过程渗透演化规律试验研究[J].岩石力学与工程学报,2015,34(增2):3822-3828.
[9]王恩志,韩小妹,黄远智.低渗岩石非线性渗流机理讨论[J].岩土力学,2003,24(增):120-124.
[10]陈亮,刘建锋,王春萍,等.压缩应力条件下花岗岩损伤演化特征及其对渗透性影响研究[J].岩石力学与工程学报,2014,33(2):287-295.
[11]Dong Jia Jyun,Hsu Jui Yu,Wu Wen Jie,et al.Stress Dependence of the Permeability and Porosity of Sandstone and Shale from TCDP Hole-A[J].International Journal of Rock Mechanics and Mining Sciences,2010,47(7):1141-1157.
[12]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.
[13]常宗旭,赵阳升,胡耀青,等.裂隙岩体渗流与三维应力藕合的理论与实验研究[J].岩石力学与工程学报,2004,23(增2):4907-4911.
[14]王伟,龚传根,朱鹏辉,等.大理岩干湿循环力学特性试验研究[J].水利学报,2017,48(10):1175-1184.
[15]刘新荣,王子娟,傅晏,等.考虑干湿循环作用泥质砂岩的强度与破坏准则研究[J].岩土力学,2017,38(12):3395-3401.
[16]马芹永,郁培阳,袁璞.干湿循环对深部粉砂岩蠕变特性影响的试验研究[J].岩石力学与工程学报,2018,37(3):593-600.
[17]刘新荣,李栋梁,张梁,等.干湿循环对泥质砂岩力学特性及其微细观结构影响研究[J].岩土工程学报,2016,38(7):1291-1299.
[18]倪骁慧,李晓娟,朱珍德.不同温度循环作用后大理岩细观损伤特征的定量研究[J].煤炭学报,2011,36(2):248-254.
[19]巢志明,王环玲,徐卫亚,等.不同饱和度砂岩渗透率、孔隙度随应力变化规律研究[J].岩石力学与工程学报,2017,36(3):665-680.
[20]贾朝军,王环玲,徐卫亚,等.地下水封洞库围岩气体渗透特性及滑脱效应研究[J].工程力学,2015,32(8):50-57.