Excavation-induced microseismicity in the columnar jointed basalt of an underground hydropower station

Xiao, Yuzhou; Feng, Xia‐Ting; Chen, Bingrui; Feng, Guang-Liang; Yao, Zhibin; Hu, Lianxing

doi:10.1016/j.ijrmms.2017.04.012

Cited by 31 publications

(15 citation statements)

References 23 publications

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“…The internal structures of rock mass are generally complex and contain defects such as pores, joints, and fissures that directly affect the strength, deformation, and seepage characteristics of the rock mass, which are closely related to the stability of rock engineering [5][6][7][8]. Therefore, the mechanical behavior and failure characteristics of complex structural rock masses have become the key factors of rock mass engineering design, construction, safety, and stability evaluation [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

et al. 2021

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In the engineering of underground construction, the discontinuous structures in rock mass have important influences on the mechanical behaviors of the subsurface of rock mass. The acquisition of mechanical parameters is the basis of rock mass engineering design, construction, safety, and stability evaluation. However, the mechanical parameters and failure characteristics of the same rock mass under different mechanical conditions cannot be obtained due to the limitations of specimen preparation techniques. In recent years, with the continuous development of 3D printing (3DP) technology, it has been successfully applied to the repetitive preparation of rock mass samples. The combinations of 3DP and other techniques, such as 3D scanning and CT scanning, provided a new approach to study the mechanical behavior of complex structural rock masses. In this study, through a comprehensive review of the technical progress, equipment situation, application fields, and challenges of the use of 3DP technology, the following conclusions were obtained: (1) 3DP technology has advantages over traditional rock mass specimen preparation techniques, and the verification of test results using 3D printed samples shows that the 3DP has broad application prospects in geotechnical engineering. (2) The combination of 3DP and other advanced techniques can be used to achieve the accurate reconstruction of complex structural rock masses and to obtain the mechanical and failure characteristics of the same rock mass structure under different mechanical boundary conditions. (3) The development of 3DP materials with high strength, high brittleness, and low ductility has become the major bottleneck in the application of 3DP in geotechnical engineering. (4) 3D printers need to meet the high precision and large size requirements while also having high strength and long-term printing ability. The development of 3D printers that can print different types of materials is also an important aspect of the application of 3DP in geotechnical engineering.

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Section: Introductionmentioning

confidence: 99%

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

et al. 2021

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“…erefore, investigating the mechanical behaviors of CJB has become urgent matters in recent years due to their particular damage modes and mechanical behaviors during the CJB tunneling and excavation, which poses adverse effects on project stability. For example, in tunnel projects, during the excavation process of underground tunnels in CJB, collapses may easily occur due to their unfavorable mechanical properties [7][8][9][10]; in dam projects, the dam foundation bears substantial hydraulic pressure during the operation period, but rock mass materials of the dam foundation are normally prone to failure due to excavation and mechanical loading, especially in CJB geological conditions [11,12]. Hence, evaluating the mechanical properties and construction stability of CJB is necessary and essential [13].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on the Mechanical Properties of Columnar Jointed Basalt

Zhu

He²,

Peng³

et al. 2020

Advances in Civil Engineering

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Columnar jointed basalts (CJB) are featured by the joint network of discontinuities, which is hard for geotechnical design and construction. Therefore, investigating the mechanical behaviors of CJB is significant for the long-term use of the engineering structures. In this paper, field research studies, such as the rigid bearing plate tests and acoustic tests, were employed, to obtain the deformation modulus and the acoustic velocity of columnar jointed basalts, and the formula expressed by deformation modulus and acoustic velocity was then established, which would be a useful guidance for the site operation. Based on the monitoring and testing data of CJB, several numerical simulation models with different joint angles and weak thickness were built to further discuss the mechanical behaviors of CJB. The numerical simulation results show that the joint angle of 30° ∼ 60° presents weak antipressure abilities, for the shearing slipping force and interformational sliding are remarkable in them. Besides, the small material property difference is helpful for the compressive strength of rock masses. After adopting the most unfavorable joint angle and width to model the tunneling process in CJB, it suggests that it is easily damaged along the directions of rock joints in CJB when constructing in tunnels.

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“…In practical engineering projects, CJRM often bear cyclic loading and unloading of confinement pressure [5]. Taking Baihetan hydropower station as an example, as a hydropower plant with high impounding water level, in the impounding process, columnar joints are closed under the effect of high hydraulic pressure, while in the process of discharging water, the columnar joints are open due to the decrease of hydraulic pressure [6]. e repeated impounding and discharging water causes the cyclic loading and unloading of confinement pressure on CJRM, which has nonnegligible influence on the anisotropic permeability properties of CJRM [7].…”

Section: Introductionmentioning

confidence: 99%

“…e specimens are more homogeneous and easier to reproduce. Also, specimens with different dip angles can be obtained easily, and the anisotropic permeability of CJRM can be obtained effortlessly by measuring the permeability of CJRM with different columnar dip angles [6]. Additionally, the rock-like analogue model materials of CJRM have been adopted by some scholars to research the mechanical properties of CJRM [27].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Anisotropic Permeability and Porosity of CJRM considering Different Confinement Loading Pressures

Chao

et al. 2020

Advances in Civil Engineering

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An innovative method is proposed to prepare artificial columnar jointed rock masses (CJRM) with different columnar dip angles, and laboratory physical model tests are conducted to investigate anisotropic permeability and porosity characteristics of the prepared artificial CJRM. In the physical model experiment, permeability and porosity of artificial CJRM with different columnar dip angles is measured during three times cyclic loading and unloading of confinement pressure. Based on the results of the laboratory model tests, the Equivalent Continuum Media Model was applied to analyse anisotropic permeability of CJRM. The main conclusions are summarized as follows. In the first loading phase of confinement pressure, the impacts of confinement pressure on the anisotropic permeability of artificial CJRM, porosity, and the major and minor principle permeability coefficients (PPCs) are significant, while in the following stages of confinement pressure loading and unloading, the change of them is small, with stable value. Permeability of artificial CJRM gradually increases with rise of columnar dip angle, and the permeability anisotropy of artificial CJRM under low confinement pressure is higher than that under low confinement pressure.

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Excavation-induced microseismicity in the columnar jointed basalt of an underground hydropower station

Cited by 31 publications

References 23 publications

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

Experimental and Numerical Studies on the Mechanical Properties of Columnar Jointed Basalt

Investigation of Anisotropic Permeability and Porosity of CJRM considering Different Confinement Loading Pressures

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