Experimental study on seepage characteristics of columnar jointed rock mass with different cross-section shapes

NIU Zihao; ZHU Zhende; QUE Xiangcheng; XIE Xinghua; JIN Kai

doi:10.11779/CJGE20230925

Volume 46 Issue 12

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Chinese Journal of Geotechnical Engineering > 2024 > 46(12): 2610-2619. > DOI: 10.11779/CJGE20230925

NIU Zihao, ZHU Zhende, QUE Xiangcheng, XIE Xinghua, JIN Kai. Experimental study on seepage characteristics of columnar jointed rock mass with different cross-section shapes[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(12): 2610-2619. DOI: 10.11779/CJGE20230925

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Experimental study on seepage characteristics of columnar jointed rock mass with different cross-section shapes

NIU Zihao^{1, 2,},
ZHU Zhende³,
QUE Xiangcheng³,
XIE Xinghua⁴,
JIN Kai^{1, 2}

1.
Power China Huadong Engineering Corporation Limited, Hangzhou 311122, China
2.
Zhejiang Huadong Geotechnical Investigation and Design Institute Corporation Limited, Hangzhou 310014, China
3.
Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
4.
Department of Geotechnical Engineering, Nanjing Hydraulic Research Institute, Nanjing 210024, China

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Received Date: September 18, 2023
Available Online: April 17, 2024

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Abstract

Abstract

With the construction and commissioning of major hydropower projects represented by Baihetan of Jinsha River, it is of great significance to clarify the mechanical and seepage characteristics of engineering rock mass under complex stress environment with high confining pressure and high water pressure. Based on the field survey data and the structural characteristics of the columnar jointed basalt of dam foundation, two kinds of columnar joint similar material model samples with different dip angles β, quadrangular prisms and hexagonal prisms, are prepared, and the true triaxial stress-seepage coupling tests are carried out. The test results show that the columnar jointed rock mass with different cross-section characteristics has strong permeability anisotropy, and the permeability coefficient k is positively correlated with β at different loading stages. During the true triaxial loading process, the volume strain ε_V of the sample can be used as an effective characterization parameter of k. At the volume compression stage, k shows a low level, and at the volume expansion stage k shows a rapid growth trend. The final failure mode of the samples exhibits three typical forms, and the most dangerous failure mode is the structural failure dominated by the shear slip failure of the joint surface, which mainly occurs in the samples with β=45°, 60°. Correspondingly, the lateral support of this kind of rock mass should be strengthened in the construction design of surrounding rock of tunnels and rock mass of dam foundation.
- columnar joints,
- true triaxial stress-seepage coupling,
- anisotropy,
- failure mode

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References

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