(1. 長沙交通學(xué)院巖土研究所，長沙 410076; 2. 中南工業(yè)大學(xué)，長沙410083
3. 耒宜高速公路公司，郴州423000)
摘 要: 在應(yīng)用斷裂力學(xué)原理分析巖體裂隙擴(kuò)展特點的基礎(chǔ)上，分析討論了巖爆發(fā)生機(jī)理，提出了隧道圍巖應(yīng)力強(qiáng)度因子等值線的概念，認(rèn)為隧洞巖爆將沿該應(yīng)力強(qiáng)度因子等值線KⅡθ=KⅡC圈定的范圍崩落，巖體裂隙失穩(wěn)擴(kuò)展導(dǎo)致隧洞巖爆的必要條件為同時滿足裂紋開裂判據(jù)KⅡ=KⅡC及裂紋失穩(wěn)擴(kuò)展判據(jù)k+f'(δ)＜0，并指出同時滿足這兩個條件的巖體裂隙有臨界開裂和臨界止裂兩個長度。
關(guān)鍵字: 巖爆機(jī)理；斷裂力學(xué)；預(yù)測方法
（1. Geotech. Eng. Inst, Changsha Comunications University, Changsha 410076, P. R. China
2. Central South University of Technology, Changsha 410083, P. R. China
3. Leiyi Highway Construction Company, Chenzhou 423000, P. R. China）
Abstract:Based on the analysis for crack propagation in rockmass, the rock burst mechanism was analysed and the concept of stress intensity isogram for cavern's surrounding rockmass was proposed. The rock burst limits will be enclosed by this stress intensity isogram. The essential conditions for rock burst which caused by unstable crack propagation was simultaneously satisfied crack propagation criterion KⅡθ=KⅡC and unstable crack propagation criterion k+f'(δ)<0. The cracks which simultaneously satisfied these criteria exist critical initial fracture length and critical stop fracture length.
Key words: rock burst mechanism; fracture mechanics; predictions method
