Study on the Permeability Characteristics of Sandstone under Hydrostatic Pressure and Model Improvement

  • Lin Jian ,
  • Yang Yi ,
  • Cao Guangyong ,
  • Liu Yang ,
  • Shao Wanxing
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  • 1. Anhui Provincial Key Laboratory of Building Structure and Underground Engineering, Anhui Jianzhu University, Hefei 230601, P.R. China;
    2. Engineering Research Center of Underground Mine Construction, Ministry of Education (Anhui University of Science and Technology), Huainan, Anhui 232001, P.R. China;
    3. College of Civil Engineering, Anhui Jianzhu University, Hefei 230601, P.R. China

Received date: 2023-10-12

  Online published: 2024-07-15

Abstract

In order to explore the influence of stress state on the permeability of western weakly cemented sandstone, and to clarify the seepage and mechanical properties of rock strata during mining, the rock seepage test and nuclear magnetic resonance test under hydrostatic pressure were carried out, respectively. On this basis, the rock permeability was inversed, and the change law of the pore structure in the rock during the seepage process was analyzed, and then the nuclear magnetic permeability model was modified. The results show that: (1) The confining pressure has a significant effect on the permeability of rock, which makes the pore structure in rock change; The increase of the osmotic pressure difference will cause the expansion of the pores in the rock, increase the seepage channels and increase the permeability. (2) There is a limit value for the closure of micropores and fine pores caused by the increase of confining pressure, and the confining pressure required for micropores and fine pores to reach the closure limit is obviously lower than that of large pores; The influence of micropores and fine pores on rock permeability decreases with the increase of confining pressure; Macropore closure contributes the most to the decline of rock permeability. (3) The increase of confining pressure will lead to the transformation of large pores into micropores and micropores, and the T2 cut-off value will increase; The change of pore structure caused by the increase of confining pressure will lead to the transformation of free pores into bound pores in the rock, resulting in the change of permeability. (4) After considering the influence of confining pressure on the change of pore structure, the NMR permeability model is modified. The modified permeability model can better reflect the permeability of rocks, which provides an effective basis for the permeability inversion of this kind of rock in the NMR test.

Cite this article

Lin Jian , Yang Yi , Cao Guangyong , Liu Yang , Shao Wanxing . Study on the Permeability Characteristics of Sandstone under Hydrostatic Pressure and Model Improvement[J]. Chinese Journal of Underground Space and Engineering, 2024 , 20(3) : 776 -787 . DOI: 10.20174/j.JUSE.2024.03.08

References

[1]Fan L F, Ren F, Ma G W, et al. Experimental study on viscoelastic behavior of sedimentary rock under dynamic loading[J]. Rock Mechanics and Rock Engineering, 2012, 45(3):433-438.
[2]Li X B, Weng L. Numerical investigation on fracturing behaviors of deep-buried opening under dynamic disturbance[J]. Tunnelling and Underground Space Technology, 2016, 54: 61-72.
[3]Weng L, Huang L Q, Taheri A, et al. Rockburst characteristics and numerical simulation based on a strain energy density index: a case study of a roadway in Linglong gold mine, China[J].Tunnelling and Underground Space Technology, 2017, 69: 223-232.
[4]贾海梁,王婷,项伟,等.含水率对泥质粉砂岩物理力学性质影响的规律与机制[J].岩石力学与工程学报,2018,37(7):1618-1628.(Jia Hailiang,Wang Ting, Xiang Wei,et al. Influence of water content on the physical and mechanical behaviour of argillaceous siltstone and some microscopic explanations[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(7):1618-1628. (in Chinese))
[5]Roy D G,Singh T N,Kodikara J,et al. Effect of water saturation on the fracture and mechanical properties of sedimentary rocks[J]. Rock Mechanics and Rock Engineering,2017,50(10):2585-2600.
[6]俞缙,穆康,李宏,等.砂岩渗透性演化特性的孔隙率分布细观模拟分析[J].工程力学,2014, 31(11):124-131.(Yu Jin,Mu Kang,Li Hong,et al.The porosity distribution mesoscopic simulation analysis of the permeability evolution property of sandstone[J].Engineering Mechanics,2014,34(11):124-131. (in Chinese))
[7]俞缙,李宏,陈旭,等.渗透压–应力耦合作用下砂岩渗透率与变形关联性三轴试验研究[J].岩石力学与工程学报,2013,32(6):1203-1211.(Yu Jin,Li Hong,Chen Xu,et al. Triaxial experimental study of associated permeability-deformation of sandstone under hydro-mechanical coupling[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(6):1203-1211.(in Chinese))
[8]张凯,郭俊廷,滕腾.弱胶结砂质泥岩注水软化与渗流特性试验研究——以神东矿区为例[J].煤炭科学技术2022,20(2):195-201.(Zhang Kai, Guo Junting, Teng Teng.Experimental study on water-softening and seepage characteristics of weakly cemented sandy mudstone: taking Shendong Coal Mining Area as an example[J].Coal Science and Technology,2022, 50(2):195-201. (in Chinese))
[9]张二锋,杨更社,唐丽云,等.含水率对泥质粉砂岩损伤劣化规律影响研究[J].煤炭科学技术,2019,47(2):14-20.(Zang Erfeng, Yang Gengshe, Tang Liyun, et al.Study on influence of water content to damage and degradation laws of argillaceous siltstone [J].Coal Science and Technology, 2019, 47(2):14-20. (in Chinese))
[10]Xu P,Yang S Q. Permeability evolution of sandstone under short-term and long-term triaxial compression [J]. International Journal of Rock Mechanics and Mining Sciences, 2016, 85(5):152-164.
[11]张俊文,宋治祥,范文兵,等. 应力渗流耦合下砂岩力学行为与渗透特性试验研究[J].岩石力学与工程学报,2019,38(7):1364-1372. (Zhang Junwen,Song Zhixiang, Fan Wenbing,et al.Experimental study on mechanical behavior and permeability characteristics of sandstone under stress-seepage coupling[J].Chinese Journal of Rock Mechanics and Engineering,2019, 38(7):1364-1372.(in Chinese))
[12]Hu D W,Zhou H,Zhang F,et al. Evolution of poroelastic properties and permeability in damaged sandstone[J].International Journal of Rock Mechanics and Mining Sciences,2010,47(6):962-973.
[13]张玉,徐卫亚,赵海斌,等.渗流-应力流变耦合作用下破碎带砂岩渗透演化规律试验研究[J].中国石油大学学报,2014,38(4):154-161.(Zhang Yu,Xu Weiya,Zhao Haibin,et al. Investigation on permeability evolution of sandstone from fractured zone under coupling action of hydro-mechanical-creep[J].Journal of China University of Petroleum,2014,38(4):154-161. (in Chinese))
[14]张玉,于婷婷,张通,等.复杂应力路径下裂隙泥岩渗透演化规律试验研究[J].工程科学学报,2021,43(7):903-914.(Zhang Yu, Yu Tingting, Zhang Tong, et al. Experimental study of the permeability evolution of fractured mudstone under complex stress paths [J]. Chinese Journal of Engineering, 2021, 43(7):903-914. (in Chinese))
[15]Tan X, Konietzky H, Frühwirt T,et al. Laboratory observation and numerical simulation of permeability evolution during progressive failure of brittle rocks [J]. International Journal of Rock Mechanics and Mining Sciences, 2014, 68:167-176.
[16]Yu B C, Zhang D M, Xu B,et al . Experimental study on the effective stress law and permeability of damaged sandstone under true triaxial stress [J]. International Journal of Rock Mechanics and Mining Sciences, 2022, 157:105169.
[17]李宇白,翟越,李艳,等.冻融循环后砂岩抗冲击力学特性及数值模拟[J].地下空间与工程学报,2022,18(5):1580-1587.( Li Yubai, Zhai Yue, Li Yan, et al. Sandstone impact mechanical properties and numerical simulation after freeze-thaw cycles [J]. Chinese Journal of Underground Space and Engineering, 2022, 18(5):1580-1587. (in Chinese))
[18]赵阳,周宏伟,任伟光,等.循环荷载下深部煤层工作面顶板砂岩的渗透率演化规律[J].煤炭学报,2019,44(5):1495-1507.(Zhao Yang, Zhou Hongwei, Ren Weiguang,et al. Permeability evolution of roof sandstone at deep coal seam working face under cyclic loading[J]. Journal of China Coal Society,2019,44(5):1495-1507.(in Chinese))
[19]Yu J , Yao W, Duan K, et al. Experimental study and discrete element method modeling of compression and permeability behaviors of weakly anisotropic sandstones[J].International Journal of Rock Mechanics and Mining Science,2020,134:104437.
[20]武治盛,冯子军,张驰,等.两种有效应力下花岗岩和充填体渗透率变化规律研究[J].地下空间与工程学报,2021,17(5):1391-1398.(Wu Zhisheng, Feng Zijun, Zhang Chi, et al. Study on permeability of granite and backfill in two effective stress paths [J]. Chinese Journal of Underground Space and Engineering, 2021, 17(5):1391-1398. (in Chinese))
[21]张蕊,严磊,钱自卫,等.岩石变形与渗透率演化关系研究[J].地下空间与工程学报,2022,18(1):129-135.(Zhang Rui, Yan Lei, Qian Ziwei, et al. Study on the evolution relationship of the deformation mechanism and permeability of underground rock [J]. Chinese Journal of Underground Space and Engineering, 2022, 18(1):129-135. (in Chinese))
[22]Chen X, Yu J, Tang C A, et al. Experimental and numerical investigation of permeability evolution with damage of sandstone under triaxial compression [J]. Rock Mechanics and Rock Engineering, 2017, 50(6):1529-1549.
[23]田佳丽,王惠民,刘星星,等.基于NMR耦合实时渗流的砂岩渗透特性研究[J].岩土工程学报,2022,44(9):1671-1678.(Tian Jiali, Wang Huimin, Liu Xingxing, et al. Study on permeability characteristics of sandstone based on NMR coupling real-time seepage[J]. Journal of Geotechnical Engineering, 2022,44 (9): 1671-1678. (in Chinese))
[24]蒋长宝,余塘,魏文辉,等.加卸载应力作用下煤岩渗透率演化模型研究[J].岩土力学,2022,43(增1):13-22. (Jiang Changbao, Yu Tang, Wei Wenhui, et al. Permeability evolution model of coal under loading and unloading stresses [J]. Rock and Soil Mechanics, 2022,43(Suup.1):13-22. (in Chinese))
[25]林键.西部含水基岩段冻结立井井壁外荷载形成机理研究[D].淮南:安徽理工大学,2019.(Lin Jian.Study on formation mechanism of external load of frozen shaft in water-bearing bedrock section in western China [D]. Huainan:Anhui University of Science and Technology,2019.(in Chinese))
[26]Jia H, Ding S, Wang Y, et al. An NMR-based investigation of pore water freezing process in sandstone[J]. Cold Regions Science and Technology,2019,168:102893.
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