Document

Research on initiation stress of jointed rock mass under triaxial compression test

Hang Zhao a

Xinping Li b

Tingting Liu b

Yi Luo b

a. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, ChinaSchool of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, China
b. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, China
* Author to whom correspondence should be addressed
2023.2(1); https://doi.org/10.58396/cmce020105
Received: 03 May 2023 / Accepted:28 May 2023 / Published: 06 Jun 2023

Journal Browser

Announcements

more >

Discount on article processing charges

2023-12-20

Abstract

On the basis of the experimental study about the elastic wave propagation characteristics in jointed rock mass under triaxial compression test, Firstly, the initiation stress is determined by the comparison of the experimental results. After that, on the basis of fracture mechanics theory, the fracture development process of rock mass is studied, and the initiation strength equation of fractured rock mass is established. Finally, combined with experimental data, verification and analysis of the initiation strength equation. Research shows:(1) In intact rock mass, the opening and closing of microscopic cracks have less effect on the amplitude of the elastic wave, but in jointed rock mass, that have great effect on the amplitude of the elastic wave. (2) Under different confining pressures of triaxial compression test, as the cracks in the rock mass start breaking, the axial compressive stress is linear with confining pressure. (3) The initiation strength equation of jointed rock mass is in accordance with the experimental results, the research results have some guidance significance to practical engineering.

Keywords:

Elastic wave, triaxial compression, initiation stress, confining pressures.

References

[1] Zhang C, Chen X, Hou J, et al. STUDY OF MECHANICAL BEHAVIOR OF DEEP-BURIED MARBLE AT JINPING II HYDROPOWER STATION[J]. Chinese Journal of Rock Mechanics & Engineering, 2010, 29(10):1999-2009.

[2] MARTIN C D. The strength of massive Lac du Bonnet granite around underground opening [Ph. D. Thesis] [D]. Winnipeg,Canada: University of Manitoba, 1993.

[3] BRACE W F, BYERLEE J D. Recent experimental studies of brittle fracture of rocks[C]// Proceedings of the 8th U.S.Symposium on Rock Mechanics. Minneapolis: [s. N.],1966: 58-81.

[4] CAI M, KAISER P K, TASAKA Y M, et al. Generalized crack initiation and crack damage stress thresholds of brittle rock masses near underground excavations[J]. International Journal of Rock Mechanics and Mining Sciences, 2004, 41(5): 833-847. DOI：10.1016/j.ijrmms.2004.02.001

[5] EBERHARDT E, SREAD D, STIMPSON B. Quantifying progressive pre-peak brittle fracture damage in rock during uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences, 1999, 36(3): 361-380. DOI：10.1016/S0148-9062(99)00019-4.

[6] ZHOU Hui, MENG Fanzhen, ZHANG Chuanqing, YANG Fanjie, LU Jingjing. Characteristics and mechanism of occurrence of stress thresholds and corresponding strain for hard rock[J]. Chinese Journal of Rock Mechanics and Engineering,2015,34(8):1513-1521. DOI：10.13722/j.cnki.jrme.2014.0338

[7] ZHANG Xiaoping, WANG Sijing, HAN Gengyou, et al. Crack propagation study of rock based on uniaxial compressive test-A case study of schistose rock[J]. Chinese Journal of Rock Mechanics and Engineering,2011,30(9):1 772-1 781. DOI：10.1111/j.1759-6831.2010. 00113.x

[8] LIU Ning, ZHANG Chunsheng, CHU Weijiang. Fracture characteristics and damage evolution law of Jinping deep marble[J]. Chinese Journal of Rock Mechanics and Engineering,2012, 31(8):1 606-1 613.

[9] ZHANG Chun-sheng, CHEN Xiang-rong, HOU Jing, et al. Study of mechanical behavior of deep-buried marbleat Jinping II Hydropower Station[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(10): 1999-2009.

[10] LI Xinping, ZHAO Hang, LUO Yi, et al. Experimental study of propagation and attenuation of elastic wave in deep rock mass with joints [J]. Chinese Journal of Rock Mechanics and Engineering, 2015,34(11):2319-2326.DOI：10.13722/j.cnki.jrme.2015.0868

[11] Zhu Weishen, He Manchao. Book review to work of "Stability of Rock Surrounding in Complex Condition and Dynamic Construction Mechanics". The Hong Kong Instituation of Engineers. 2000