(1. 中南大學(xué) 資源與安全工程學(xué)院，長沙 410083；
2. 中國礦業(yè)大學(xué) 深部巖土力學(xué)與地下工程國家重點(diǎn)實驗室，徐州 221008；
3. 中南大學(xué) 高等研究中心，長沙 410083)
摘 要: 在考慮強(qiáng)度準(zhǔn)則參數(shù)粘聚力c、內(nèi)摩擦角φ和巖石材料常數(shù)m隨應(yīng)變率增加而變化的基礎(chǔ)上，分別提出了基于應(yīng)變率效應(yīng)的巖石動態(tài)Mohr-Coulomb準(zhǔn)則和Hoek-Brown準(zhǔn)則。花崗巖材料在6種圍壓下的三軸試驗結(jié)果表明：當(dāng)應(yīng)變率從10-4 s-1增加到100 s-1時，粘聚力c和巖石材料常數(shù)m均隨應(yīng)變率增加而增加，但是內(nèi)摩擦角φ則隨應(yīng)變率增加而減小。為此，給出了上述3項參數(shù)隨應(yīng)變率變化的函數(shù)關(guān)系，并在此基礎(chǔ)上，分別提出了考慮率效應(yīng)的動態(tài)Mohr-Coulomb準(zhǔn)則和Hoek-Brown準(zhǔn)則表達(dá)式。通過理論計算結(jié)果與試驗數(shù)據(jù)的對比，發(fā)現(xiàn)動態(tài)Mohr-Coulomb準(zhǔn)則適應(yīng)于低圍壓情況，而動態(tài)Hoek-Brown準(zhǔn)則在低圍壓和高圍壓情況下均適用。
關(guān)鍵字: 巖石力學(xué)；抗剪強(qiáng)度參數(shù)；應(yīng)變率；動態(tài)Mohr-Coulomb準(zhǔn)則；動態(tài)Hoek-Brown準(zhǔn)則
（1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory for Geomechanics and Deep Underground Engineering,
China University of Mining and Technology, Xuzhou 221008, China;
3. Advanced Research Center of CSU, Central South University, Changsha 410083, China）
Abstract:Considering the changes of strength criterion parameters cohesion c, internal friction angle φ and rock material constants m with the increase of strain rate, the rock dynamic Mohr-Coulomb criterion and Hoek-Brown criterion based on strain rate effect were proposed in this study. According to the triaxial experimental data of a granite under six confining pressures, the results show that, when the strain rate increases from 10-4 s-1 to 100 s-1, the cohesion c and rock material constants m increase, while the internal friction angle φ decreases with the increase of strain rate. The relationship between each strength criterion parameter and strain rate is given firstly. On this basis, the expression of dynamic Mohr-Coulomb criterion and Hoek-Brown criterion considering strain rate effect are presented, respectively. Through the comparison of theoretical calculation results with the experimental data, it can be concluded that the dynamic Mohr-Coulomb criterion is suitable for low confining pressure situation, while the dynamic Hoek-Brown criterion is applicable under low and high confining pressure conditions.
Key words: rock mechanics; shear strength parameters; strain rate; dynamic Mohr-Coulomb criterion; dynamic Hoek-Brown criterion
