›› 2015, Vol. 36 ›› Issue (2): 403-408.doi: 10.16285/j.rsm.2015.02.015

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Determination of residual strength of rocks by a brittle index

PENG Jun1, 2, RONG Guan1, 2, CAI Ming3, PENG Kun4   

  1. 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering, Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China; 3. Bharti School of Engineering, Laurentian University, Sudbury, Ontario P3E 2C6, Canada; 4. China Shipbuilding NDRI Engineering Co., Ltd., Shanghai 200063, China
  • Received:2013-10-10 Online:2015-02-11 Published:2018-06-13

PDF (Chinese)

2462

Abstract: Residual strength of rocks is an important parameter in rock mechanics, because it has a significant influence on accurately evaluating stability of underground excavations and optimizing design of rock mass support. Based on triaxial mechanical properties of the rock, an index, defined as the strength degradation coefficient, is proposed to describe the post-peak strength degradation of rock. In this paper, the index is in essence a brittle index for rocks. A power model is then proposed for the relationship between the strength degradation coefficient and the confinement stress. By fitting the data from 22 lab triaxial compression tests, it is found that the parameters in the model which are different in various rocks can be mainly related to the mineralogical composition and the structure of rocks. Furthermore, a strength degradation method based model is proposed for determining the residual strength of rocks. It is found that the proposed model fits triaxial compression test data of rocks better than the classical Mohr-Coulomb failure criterion does. Meanwhile, it can reflect the influence of structural properties on the residual strength of rocks.

Key words: residual strength, strength degradation, triaxial compression, brittleness

CLC Number: 

  • TU 45
[1] GAO Feng, CAO Shan-peng, XIONG Xin, ZHOU Ke-ping, ZHU Long-yin, . Brittleness evolution characteristics of cyan sandstone under freeze-thaw cycles [J]. Rock and Soil Mechanics, 2020, 41(2): 445-452.
[2] ZHOU Cui-ying, LIANG Ning, LIU Zhen, . Fractal characteristics of compression failure of red soft rock and cascading failure process [J]. Rock and Soil Mechanics, 2019, 40(S1): 21-31.
[3] XIE Hui-hui, XU Zhen-hao, LIU Qing-bing, HU Gui-yang, . Evolution of peak strength and residual strength of weak expansive soil under drying-wetting cycle paths [J]. Rock and Soil Mechanics, 2019, 40(S1): 245-252.
[4] ZHOU Hui, CHEN Jun, ZHANG Chuan-qing, ZHU Yong, LU Jing-jing, JIANG Yue, . Experimental study of the rockburst model material with low-strength and high-brittleness [J]. Rock and Soil Mechanics, 2019, 40(6): 2039-2049.
[5] SHAO Sheng-jun, CHEN Fei, DENG Guo-hua, . Seismic passive earth pressure against the retaining wall of structural loess based on plane strain unified strength formula [J]. Rock and Soil Mechanics, 2019, 40(4): 1255-1262.
[6] LI Xiao-zhao, QI Cheng-zhi, SHAO Zhu-shan, QU Xiao-lei, . Micromechanics-based model study of shear properties of brittle rocks [J]. Rock and Soil Mechanics, 2019, 40(4): 1358-1367.
[7] SONG Hong-qiang, ZUO Jian-ping, CHEN Yan, LI Li-yun, HONG Zi-jie, . Revised energy drop coefficient based on energy characteristics in whole process of rock failure [J]. Rock and Soil Mechanics, 2019, 40(1): 91-98.
[8] PENG Shou-jian, WANG Zhe, XU Jiang, OKUBO Seisuke, TANG Yang, . Experimental study on loading rate effect in post-failure region of water-saturated rock under triaxial compression [J]. Rock and Soil Mechanics, 2018, 39(S2): 72-82.
[9] CUI De-shan, CHEN Qiong, XIANG Wei, WANG Jing-e, . Experimental study of stress relaxation characteristics of saturated sliding zone soils of Huangtupo landslide under triaxial compression [J]. Rock and Soil Mechanics, 2018, 39(S2): 209-216.
[10] HUANG Hong-xiang, CHEN Yu-min, WANG Jian-ping, LIU Han-long, ZHOU Xiao-zhi, HUO Zheng-ge, . Ring shear tests on shear strength of calcareous sand [J]. , 2018, 39(6): 2082-2088.
[11] LI Lei, JIANG Ming-jing, ZHANG Fu-guang, . Quantitative simulation of triaxial test considering residual strength on deep rock using DEM and parameter analysis [J]. , 2018, 39(3): 1082-1090.
[12] MA Xu-qiang, SHI Xi-lin, YIN Hong-wu, YANG Chun-he, LI Yin-ping, MA Hong-ling，. Failure mechanisms of salt rock with an interlayer under triaxial compression [J]. , 2018, 39(2): 644-650.
[13] ZHANG Jin-xun, YANG Hao, SHAN Ren-liang, SUI Shun-meng, XUE Dong-chao，. Experimental research on triaxial compressive strength of frozen saturated sandy gravel [J]. , 2018, 39(11): 3993-4000.
[14] ZHANG Xi-wei, WANG Gang, CAI Ming, XU Quan，. Deformation behaviour and brittleness of Linghai granite [J]. , 2018, 39(10): 3515-3524.
[15] SUO Yu, GE Hong-kui, WANG Xiao-qiong, MENG Fan-bao, LIU Jun-rong. Instruments and methods with high-precision for wave velocity measurement on shale debris [J]. , 2018, 39(1): 385-392.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] CHU Xi-hua, XU Yuan-jie. Studies on transformation from M-C criterion to Drucker-Prager criterions based on distortion energy density[J]. , 2009, 30(10): 2985 -2990 .
[2] LIU Dou-dou, CHEN Wei-zhong, YANG Jian-ping, TAN Xian-jun, ZHOU X. Experimental research on strength characteristic of brittle rock unloading confining pressure[J]. , 2009, 30(9): 2588 -2594 .
[3] WANG Gui-yao，LI Bin，LUO Jun，FU Hong-yuan. Study of soil-water charactiristics and matric suction measurement device for unsaturated silty soil[J]. , 2010, 31(11): 3678 -3682 .
[4] LU Ying-fa, CHENG Zhu-lei, XIE Wen-liang, Lü Zhi-zhong. Application of geotechnics to sanitation landfill of refuse[J]. , 2009, 30(1): 91 -98 .
[5] JIA Qiang, YING Hui-qing, ZHANG Xin. Construction of basement in existing buildings by static bolt-pile[J]. , 2009, 30(7): 2053 -2057 .
[6] LU Jun-fu，WANG Ming-nian，JIA Yuan-yuan，YU Yu， TAN Zhong-sheng. Research on construction time of secondary lining of large section loess tunnel for high-speed railway[J]. , 2011, 32(3): 843 -848 .
[7] FANG Tao , LIU Xin-rong , GENG Da-xin , LUO Zhao , JI Xiao-tuan , ZHENG Ming-xin . Model testing study of vertical bearing behaviors for large diameter pile with variable cross-section (I)[J]. , 2012, 33(10): 2947 -2952 .
[8] HU Wan-yu ，CHEN Xiang-hao ，LIN Jiang ，KUANG Lei-qiang . In-situ drilling tests of seepage in gravel soil core wall during the first impoundment in Pubugou hydropower station[J]. , 2013, 34(5): 1259 -1263 .
[9] ZHU Xing ，XU Qiang ，TANG Ming-gao ，FU Xiao-min ，ZHOU Jian-bin . Experimental study of infrasound wave generated by typical rock fracture[J]. , 2013, 34(5): 1306 -1312 .
[10] PENG Chong ，ZHANG Zong-liang ，ZHANG Bing-yin ，YUAN You-ren . Deformation gradient finite element method for analyzing cracking in high earth-rack dam and its application[J]. , 2013, 34(5): 1453 -1458 .
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd