人字形切槽巴西圆盘I型渐进断裂数值模拟研究

doi:10.13722/j.cnki.jrme.2014.1050

Abstract
Figure/Table
References (24)
Related Citation (15)

Download: PDF (1802 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract

The cracked chevron notched Brazilian disc(CCNBD) method，which is suggested by the International Society for Rock Mechanics(ISRM) for measuring mode-I fracture toughness of rocks，was numerically investigated by a code based on microscopic damage mechanics. Varying notch width，sample geometries，material parameters and inhomogeneity are considered，and the progressive fracture process of the CCNBD specimen was intuitively presented. Through the simulated stress distributions and acoustic emission activities，the straight- through crack assumption(STCA) was strictly assessed，which is used by traditional methods for calibrating the dimensionless stress intensity factor(SIF). Numerical results show that，crack fronts of CCNBD specimens are always curved regardless of rock heterogeneity，significantly violating the STCA. For the specimen with a more slender chevron ligament，the crack front is curved more severely. Traditional critical SIFs are found to be only 90 to 95 percent of the values that are calibrated by utilizing the simulated critical crack fronts. CCNBD samples always crack from two sides of the notch width of the chevron ligament tip，and thus the specimens with relatively smaller notch width are suggested，so that the realistic fracture route of CCNBD can align well with the ideal test principle. The numerical results call for more attention to the real fracture mechanism of the chevron notched samples. A better calibration of dimensionless SIFs should consider more realistic fracture characteristics for a better measure of fracture toughness.

Key words： rock mechanics fracture toughness cracked chevron notched Brazilian disc(CCNBD) straight-through crack assumption numerical simulation dimensionless stress intensity factor

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	DAI Feng1
	2
	WEI Mingdong1
	2
	XU Nuwen1
	2
	XU Yuan1
	2
	LI Biao1
	2

Cite this article:

DAI Feng1,2,WEI Mingdong1, et al. A NUMERICAL STUDY OF MODE-I PROGRESSIVE ROCK FRACTURE process OF CRACKED CHEVRON NOTCHED BRAZILIAN DISC[J]. , 2015, 34(S2): 3906-3914.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1050 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/IS2/3906

[1] 崔振东，刘大安，安光明，等. V形切槽巴西圆盘法测定岩石断裂韧度K_IC的实验研究[J]. 岩土力学，2010，31(9)：2 743–2 748.(CUI Zhendong，LIU Daan，AN Guangming，et al. Research for determining mode I rock fracture toughness K_IC using cracked chevron notched brazilian disc specimen[J]. Rock and Soil Mechanics，2010，31(9)：2 743–2 748.(in Chinese))

[2] 徐纪成，刘大安，孙宗颀，等. 岩石断裂韧度的国际联合实验研究[J]. 中南工业大学学报，1995，26(3)：310–313.(XU Jicheng，LIU Daan，SUN Zongqi，et al. International joint experiment study for the fracture toughness of rock materials[J]. Journal of Central South University of Technology，1995，26(3)：310–313.(in Chinese))

[3] DWIVEDI R D，SONI A K，GOEL R K，et al. Fracture toughness of rock under sub-zero temperature conditions[J]. International Journal of Rock Mechanics and Mining Sciences，2000，37(8)：1 267–1 275.

[4] IQBAL M J，MOHANTY B. Experimental calibration of ISRM suggested fracture toughness measurement techniques in selected brittle rocks[J]. Rock Mechanics and Rock Engineering，2007，40(5)：453–475.

[5] Erarslan N. A study on the evaluation of the fracture process zone in CCNBD rock samples[J]. Experimental Mechanics，2013，53(8)：1 475–1 489.

[6] Tutluoglu L，Keles C. Effects of geometric factors on mode I fracture toughness for modified ring tests[J]. International Journal of Rock Mechanics and Mining Sciences，2012，51：149–161.

[7] Sheity D K，Rosenfield A R，Duckworth W H. Fracture toughness of ceramics measured by a chevron-notch diametral- compression test[J]. Journal of the American Ceramic Society，1985，68(12)：C325–C327.

[8] Iqbal M J，Mohanty B. Experimental calibration of stress intensity factors of the ISRM suggested cracked chevron-notched Brazilian disc specimen used for determination of mode-I fracture toughness[J]. International Journal of Rock Mechanics and Mining Sciences，2006，43(8)：1 270–1 276.

[9] WANG Q Z，JIA X M，KOU S Q，et al. More accurate stress intensity factor derived by finite element analysis for the ISRM suggested rock fracture toughness specimen-CCNBD[J]. International Journal of Rock Mechanics and Mining Sciences，2003，40(2)：233–241.

[10] WANG Q Z，FAN H，GOU X P，et al. Recalibration and clarification of the formula applied to the ISRM—suggested CCNBD specimens for testing rock fracture toughness[J]. Rock Mechanics and Rock Engineering，2013，46(2)：303–313.

[11] CHEN J F. The development of the cracked-chevron-notched Brazilian disc methods for rock fracture toughness measurement[C]// Proceedings of 1990 SEM Spring Conference on Experimental Mechanics. Albuquerque，USA：[s.n.]，1990：18–23.

[12] XU C，FOWELL R J. Stress intensity factor evaluation for cracked chevron notched Brazilian disc specimen[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1994，31(2)：157–162.

[13] Cui Z，Liu D，An G，et al. A comparison of two ISRM suggested chevron notched specimens for testing mode–I rock fracture toughness[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(5)：871–876.

[14] WANG Q Z. Formula for calculating the critical stress intensity factor in rock fracture toughness tests using cracked chevron notched Brazilian disc(CCNBD) specimens[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(6)：1 006–1 011.

[15] Ouchterlony F. Suggested methods for determining the fracture toughness of rock[J]. International Journal of Rock Mechanics and Mining Sciences，1988，25(2)：71–96.

[16] 梁正召，唐春安，张永彬，等. 岩石三维破裂过程的数值模拟研究[J]. 岩石力学与工程学报，2006，25(5)：931–936.(LIANG Zhengzhao，TANG Chun¢an，ZHANG Yongbin，et al. 3D numerical simulation of failure process of rock[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(5)：931–936.(in Chinese))

[17] 林鹏，周雅能，李子昌，等. 含三维预置单裂纹缺陷岩石破坏实验研究[J]. 岩石力学与工程学报，2008，27(增2)：3 882–3 887.(LIN Peng，ZHOU Yaneng，LI Zichang，et al. Experimental study on failure behavior of rock containing three-dimensional single pre-existing flaw[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.2)：3 882–3 887.(in Chinese))

[18] ZHU W C，LI Z H，ZHU L，et al. Numerical simulation on rockburst of underground opening triggered by dynamic disturbance[J]. Tunnelling and Underground Space Technology，2010，25(5)：587–599.

[19] XU N W，TANG C A，LI L C，et al. Microseismic monitoring and stability analysis of the left bank slope in Jinping first stage hydropower station in southwestern China[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(6)：950–963.

[20] DAI F，CHEN R，IQBAL M J，et al. Dynamic cracked chevron notched Brazilian disc method for measuring rock fracture parameters[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(4)：606–613.

[21] Fowell R J. Suggested method for determining mode I fracture toughness using cracked chevron notched Brazilian disc(CCNBD) specimens[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1995，32(1)：57–64.

[22] 戴峰，王启智. 有限宽切槽对CCNBD断裂试样应力强度因子的影响[J]. 岩土力学，2004，25(3)：427–431.(DAI Feng，WANG Qizhi. Effects of finite notch width on stress intensity factor for CCNBD specimen[J]. Rock and Soil Mechanics，2004，25(3)：427–431.(in Chinese))

[23] 樊鸿，张盛，苟小平，等. 岩石断裂韧度试样CCNBD临界应力强度因子的全新数值标定[J]. 应用力学学报，2011，28(4)：416–423.(FAN Hong，ZHANG Sheng，GOU Xiaoping，et al. A new numerical calibration of the critical stress intensity factor for the CCNBD specimens used in rock fracture toughness test[J]. Chinese Journal of Applied Mechanics，2011，28(4)：416–423.(in Chinese))

[24] 贾学明，王启智. 断裂韧度试样CCNBD宽范围应力强度因子标定[J]. 岩土力学，2003，24(6)：907–912.(JIA Xueming，WANG Qizhi. Wide range calibration of the stress intensity factor for the fracture toughness specimen CCNBD[J]. Rock and Soil Mechanics，2003，24(6)：907–912.(in Chinese))