灰岩单裂隙非饱和渗流–应力耦合特性试验研究

doi:10.13722/j.cnki.jrme.2021.0823

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摘要为研究不同应力条件下岩体裂隙非饱和渗流特性及其影响因素，基于自主研发的岩体裂隙非饱和渗流试验系统，对4组灰岩裂隙试样开展变饱和度和不同围压条件下的渗透试验。试验结果表明：(1) 随着围压的增加，裂隙进气值增大，非饱和渗透系数–毛细压力关系曲线下降斜率及幅度均减小，在相同毛细压力下，高围压对应的裂隙非饱和渗透系数要高于低围压的情况；(2) 通过对比毛细压力、围压这2个因素对非饱和渗透系数的影响发现，随着毛细压力的增加，围压对非饱和渗透系数的影响降低；同样，随着围压的增加，毛细压力对非饱和渗透系数的影响降低；(3) 随着粗糙度的增大，裂隙饱和渗透系数降低，残余饱和度有小幅增长；(4) 基于不同围压和毛细压力下的裂隙非饱和渗流试验数据，对裂隙非饱和渗透系数与毛细压力和围压的关系式进行拟合，从拟合曲面与试验实测数据的对比来看，拟合关系式可以较为准确地描述试验测得的裂隙非饱和渗透系数随毛细压力和围压的变化。本文对变应力条件下裂隙非饱和渗流过程及规律的研究成果可为降雨入渗条件下的工程岩体稳定分析提供依据。

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	胡云进1
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	杨申东1
	2
	3
	钟振1
	2
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	王小宇1
	2
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	张拓威4
	周如杰1
	2
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关键词 ：岩石力学, 灰岩单裂隙, 非饱和渗流, 围压, 非饱和渗透系数, 毛细压力

Abstract：In order to investigate the properties and influencing factors of unsaturated flow through a single rock fracture under different confining stress，unsaturated flow experiments are performed on four single limestone fractures under various saturations and confining pressures by use of the self-developed rock fracture unsaturated flow test system. The experimental results show that：(1) With the increase of confining pressure，the air entry pressure increases，and the decline slope and amplitude of unsaturated permeability coefficient and capillary pressure relationship curve decrease. Under the same capillary pressure, the fracture unsaturated permeability coefficient corresponding to high confining pressure is higher than that under low confining pressure. (2) By comparing the effects of capillary pressure and confining pressure on unsaturated permeability coefficient，it is found that the effect of confining pressure on unsaturated permeability coefficient decreases with the increase of capillary pressure. Similarly，with the increase of confining pressure，the effect of capillary pressure on unsaturated permeability decreases. (3) With the increase of roughness，the fracture saturated permeability coefficient decreases and the residual saturation increases slightly. (4) Based on the fracture unsaturated flow test data under different confining pressures and capillary pressures，the relationship between fracture unsaturated permeability coefficient and capillary pressure and confining pressure is fitted. From the comparison between the fitting surface and the test data, the fitting relationship can accurately describe the change of fracture unsaturated permeability coefficient with capillary pressure and confining pressure. The research results on the process and law of unsaturated flow in fractures under variable stress can provide a basis for the stability analysis of engineering rock mass under the condition of rainfall infiltration.

Key words： rock mechanics a single limestone fracture unsaturated flow confining stress unsaturated permeability coefficient capillary pressure

引用本文:

胡云进1，2，3，杨申东1，2，3，钟振1，2，3，王小宇1，2，3，张拓威4，周如杰1，2，3. 灰岩单裂隙非饱和渗流–应力耦合特性试验研究[J]. 岩石力学与工程学报, 2022, 41(S1): 2846-2856.
HU Yunjin1，2，3，YANG Shendong1，2，3，ZHONG Zhen1，2，3，WANG Xiaoyu1，2，3，ZHANG Tuowei4，ZHOU Rujie1，2，3. Experimental study on unsaturated flow properties through a single limestone fracture under confining pressure. , 2022, 41(S1): 2846-2856.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0823 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/2846

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