Study on Non-Darcian Flow in Interlayer Shear Weakness Zones in the Basalt by High-Pressure Packer Tests

The interlayer shear weakness zone (ISWZ) is a special structural plane with different widths and spacing in stratified rock masses, it has higher permeability compared with surrounding rocks which is a risk factor for the safety of the hydropower station project. The high-pressure packer test (HPPT...

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Autores principales:	Qi Shen, Zhifang Zhou, Meng Chen, Zhe Wang, Yabing Li
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi-Wiley 2021
Materias:	Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/2f5e289e40624e2b840ec61fa004ac23
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spelling	oai:doaj.org-article:2f5e289e40624e2b840ec61fa004ac232021-11-08T02:36:57ZStudy on Non-Darcian Flow in Interlayer Shear Weakness Zones in the Basalt by High-Pressure Packer Tests1468-812310.1155/2021/3584654https://doaj.org/article/2f5e289e40624e2b840ec61fa004ac232021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/3584654https://doaj.org/toc/1468-8123The interlayer shear weakness zone (ISWZ) is a special structural plane with different widths and spacing in stratified rock masses, it has higher permeability compared with surrounding rocks which is a risk factor for the safety of the hydropower station project. The high-pressure packer test (HPPT) by step injection is always applied to characterize the permeability of ISWZ. However, the non-Darcian flow is easy to appear under high pressure, which makes the Darcy law model no longer applicable. In this study, two non-Darcian flow analytical methods for confined aquifer were proposed to investigate the non-Darcian flow permeability parameters. The equivalent permeability coefficients of different non-Darcian models were derived as well. The in situ tests were conducted on the ISWZs at the Baihetan hydropower station to verify the proposed methods. The results indicate that the flow is non-Darcian flow in the test section from integrity to destruction during the whole HPPT process. Izbash’s law has a better fit than Forchheimer’s law in this complicated test situation. The equivalent permeability coefficients after destruction are one or two orders of magnitude larger than those before. Meanwhile, it is necessary to pay attention to the increased difference of two expressions of the equivalent permeability coefficients under higher gradient (i) or velocity (v). In general, these methods can be used to evaluate the characteristic of ISWZ to analyze the impact on engineering stability.Qi ShenZhifang ZhouMeng ChenZhe WangYabing LiHindawi-WileyarticleGeologyQE1-996.5ENGeofluids, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geology QE1-996.5
spellingShingle	Geology QE1-996.5 Qi Shen Zhifang Zhou Meng Chen Zhe Wang Yabing Li Study on Non-Darcian Flow in Interlayer Shear Weakness Zones in the Basalt by High-Pressure Packer Tests
description	The interlayer shear weakness zone (ISWZ) is a special structural plane with different widths and spacing in stratified rock masses, it has higher permeability compared with surrounding rocks which is a risk factor for the safety of the hydropower station project. The high-pressure packer test (HPPT) by step injection is always applied to characterize the permeability of ISWZ. However, the non-Darcian flow is easy to appear under high pressure, which makes the Darcy law model no longer applicable. In this study, two non-Darcian flow analytical methods for confined aquifer were proposed to investigate the non-Darcian flow permeability parameters. The equivalent permeability coefficients of different non-Darcian models were derived as well. The in situ tests were conducted on the ISWZs at the Baihetan hydropower station to verify the proposed methods. The results indicate that the flow is non-Darcian flow in the test section from integrity to destruction during the whole HPPT process. Izbash’s law has a better fit than Forchheimer’s law in this complicated test situation. The equivalent permeability coefficients after destruction are one or two orders of magnitude larger than those before. Meanwhile, it is necessary to pay attention to the increased difference of two expressions of the equivalent permeability coefficients under higher gradient (i) or velocity (v). In general, these methods can be used to evaluate the characteristic of ISWZ to analyze the impact on engineering stability.
format	article
author	Qi Shen Zhifang Zhou Meng Chen Zhe Wang Yabing Li
author_facet	Qi Shen Zhifang Zhou Meng Chen Zhe Wang Yabing Li
author_sort	Qi Shen
title	Study on Non-Darcian Flow in Interlayer Shear Weakness Zones in the Basalt by High-Pressure Packer Tests
title_short	Study on Non-Darcian Flow in Interlayer Shear Weakness Zones in the Basalt by High-Pressure Packer Tests
title_full	Study on Non-Darcian Flow in Interlayer Shear Weakness Zones in the Basalt by High-Pressure Packer Tests
title_fullStr	Study on Non-Darcian Flow in Interlayer Shear Weakness Zones in the Basalt by High-Pressure Packer Tests
title_full_unstemmed	Study on Non-Darcian Flow in Interlayer Shear Weakness Zones in the Basalt by High-Pressure Packer Tests
title_sort	study on non-darcian flow in interlayer shear weakness zones in the basalt by high-pressure packer tests
publisher	Hindawi-Wiley
publishDate	2021
url	https://doaj.org/article/2f5e289e40624e2b840ec61fa004ac23
work_keys_str_mv	AT qishen studyonnondarcianflowininterlayershearweaknesszonesinthebasaltbyhighpressurepackertests AT zhifangzhou studyonnondarcianflowininterlayershearweaknesszonesinthebasaltbyhighpressurepackertests AT mengchen studyonnondarcianflowininterlayershearweaknesszonesinthebasaltbyhighpressurepackertests AT zhewang studyonnondarcianflowininterlayershearweaknesszonesinthebasaltbyhighpressurepackertests AT yabingli studyonnondarcianflowininterlayershearweaknesszonesinthebasaltbyhighpressurepackertests
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Study on Non-Darcian Flow in Interlayer Shear Weakness Zones in the Basalt by High-Pressure Packer Tests

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