深部硬岩开挖损伤区时效行为的中间主应力效应研究  

Intermediate Principal Stress Effect on Time-dependent Behavior of Deep Hard Rock in Excavation Damage Zone

作　　者：郁培阳 丁秀丽[1] 潘鹏志[2] 黄书岭[1] YU Pei-yang;DING Xiu-li;PAN Peng-zhi;HUANG Shu-ling(Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan 430010,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]长江水利委员会长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《水电能源科学》2023年第8期170-174,共5页Water Resources and Power

基　　金：云南省重大科技专项计划项目(202002AF080003);中央级公益性科研院所基本科研业务费项目(CKSF2021457/YT)。

摘　　要：为探究中间主应力对深部硬岩开挖损伤区时效行为的影响,基于Perzyna弹粘塑性理论和应变能理论及考虑中间主应力的三维屈服准则,建立了硬岩蠕变全过程的粘塑性损伤耦合本构模型,并将其嵌入到工程岩体破裂过程分析软件(CASRock)中,通过比较模拟结果与试验结果,验证了模型和程序的有效性。进一步模拟了锦屏地下实验室二期工程#1实验室的时效行为,并探究了不同中间主应力作用下硬岩开挖损伤区的时效破裂过程,发现硬岩的时效破裂行为表现出明显的中间主应力区间效应;通过总粘塑性应变与中间主应力的等时曲线簇发现中间主应力的区间效应受时间影响;开挖损伤区的存在能促进其内部围岩时效破裂发展,从而扩大塑性区的范围。Based on elasto-viscoplastic theory of Perzyna and strain energy theory and 3D yield criterion considering the effect of intermediate principal stress,a mesoscopic coupled elasto-viscoplastic-damage model is developed in order to explore the intermediate principal stress effect on the time-dependent behavior of deep hard rock in excavation damage zone.The model is implemented in a software for engineering rockmass fracturing process(CASRock).By comparing modeling results with experimental results,the model and the code are validated.Furthermore,the time-dependent behaviour of#1 laboratory of CJPL-II project is simulated,and the time-dependent fracture process of hard rock in excavation damage zones under different intermediate principal stresses are investigated.The results show that the time-dependent fracture behavior of hard rock exhibits an obvious interval effect of intermediate principal stress.It is found that the interval effect of the intermediate principal stress is affected by time through the isochronous curve clusters of the total viscoplastic strain and the intermediate principal stress.Finally,the existence of the excavation damage zone can promote the development of time-dependent fracture of its internal surrounding rock,thereby expanding the scope of the plastic zone.

关 键 词：中间主应力 粘塑性损伤耦合蠕变模型 时效破裂 开挖损伤区 长期强度 

分 类 号：TV554[水利工程—水利水电工程] TU45[建筑科学—岩土工程]