EXPERIMENTAL STUDIES OF ELASTIC-WAVE PROPAGATION IN A COLUMNAR-JOINTED ROCK MASS*

1986 ◽  
Vol 34 (8) ◽  
pp. 1185-1199 ◽  
Author(s):  
M.S. KING ◽  
L.R. MYER ◽  
J.J. REZOWALLI
Keyword(s):  
Wave Propagation ◽  
Rock Mass ◽  
Elastic Wave ◽  
Experimental Studies ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Elastic Wave Propagation ◽  
Columnar Jointed Rock Mass

Experimental studies in wave propagation across a jointed rock mass

2011 ◽  
Vol 71 (2) ◽  
pp. 231-234 ◽  
Author(s):  
Cengiz Kurtuluş ◽  
Maral Üçkardeş ◽  
Umut Sarı ◽  
Ş. Onur Güner
Keyword(s):  
Wave Propagation ◽  
Rock Mass ◽  
Experimental Studies ◽  
Jointed Rock ◽  
Jointed Rock Mass

scholarly journals The Method of Determining Excavation Damaged Zone by Acoustic Test and the Application in Engineering Cases

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Qian-Cheng Sun ◽  
Hao-Sen Guo ◽  
Zhi-Hua Xu ◽  
Yue Liu ◽  
Xiao Xu
Keyword(s):  
Rock Mass ◽  
Damage Evolution ◽  
Hard Rock ◽  
Damage Zone ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Surrounding Rock ◽  
Excavation Damaged Zone ◽  
Damaged Zone ◽  
Columnar Jointed Rock Mass

It is very important to accurately determine the depth of excavation damaged zone for underground engineering excavation and surrounding rock stability evaluation, and it can be measured by acoustic test, but there is no quantitative method for analysis of the results, and it relies heavily on the experience of engineers, which leads to the low reliability of the results and also limits the application of the acoustic method. According to substantial field test data and the feedback of surrounding rock support parameters, the boundary method is proposed to determine the depth of excavation damaged zone in surrounding rock based on the relation between the ultrasonic velocity of measured point and the background wave velocity of rock mass. When the method is applied to the columnar jointed rock mass of Baihetan and the deep-buried hard rock of Jinping, the excavation damaged zone was well judged. The results in the Baihetan project show that the proposed method of determining excavation damage zone by the acoustic test can well demonstrate the anisotropy characteristics of the columnar jointed rock mass, and the damage evolution characteristics of jointed rock mass at the same position can also be obtained accurately. Moreover, the method also can accurately reveal the damage evolution process of the deep-buried hard rock under the condition of high ground stress, which proved the applicability of this method in jointed or nonjointed rock masses.

scholarly journals Experimental Study on Seepage Anisotropy of a Hexagonal Columnar Jointed Rock Mass

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Yanxin He ◽  
Zhende Zhu ◽  
Wenbin Lu ◽  
Yuan Tian ◽  
Xinghua Xie ◽  
...  
Keyword(s):  
Rock Mass ◽  
Principal Stress ◽  
Material Model ◽  
Jointed Rock ◽  
Maximum Principal Stress ◽  
Jointed Rock Mass ◽  
Good Correspondence ◽  
Columnar Jointed Rock Mass ◽  
Seepage Characteristics ◽  
The Relationship

Many columnar jointed rock masses (basalt) are present at the Baihetan hydropower dam site, and their seepage characteristics have a significant impact on the project’s safety and stability. In this study, model samples consisting of material similar to the columnar jointed rock mass with different inclination angles (0°–90°) were prepared and laboratory triaxial seepage tests were performed to study the seepage characteristics of the columnar jointed rock mass under maximum axial principal stress. The experimental results showed that the similar material model samples of columnar jointed rock mass showed obvious seepage anisotropy. The nonlinear seepage characteristics were well described by the Forchheimer and Izbash equations, and the fitting coefficients of the two equations were in good correspondence. The curves describing the relationship between the inherent permeability and the stress of the samples with different dip angles were U-shaped and L-shaped, and a one-variable cubic equation well described the relationship. The 45° angle specimen had the highest sensitivity to the maximum principal stress, and its final permeability increased by 144.25% compared with the initial permeability. The research results can provide theoretical support for the stability evaluation of the Baihetan hydropower station.

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