RESEARCH ON DAMAGE MODEL OF SINGLE JOINTED ROCK MASSES UNDER COUPLING ACTION OF FREEZE-THAW AND LOADING
LI Xinping1,LU Yani1,2,WENG Yangjun1
(1. Key Laboratory of Roadway,Bridge and Structure Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China;2. School of Urban Construction,Hubei Engineering University,Xiaogan,Hubei 432000,China)
Abstract:For rock masses under freeze-thaw and loading in engineering structures in cold regions,using rock-like materials produced rock specimens with different geometric characteristics,based on the freeze-thaw experiments and uniaxial compression test,the influence of crack dip angle and crack length on the rock masses strength were studied;and combining mesoscopic damage theory and macroscopic statistical damage model,the damage model of freeze-thaw and loading rock masses were established;at the same time,damage degradation mechanism of jointed rock masses under the coupling action of freeze-thaw and loading were discussed. The research results show that:(1) The freeze-thaw damage is a process of fatigue damage;and loading damage is an uneven distribution process of stress field and deformation. (2) Freeze-thaw and loading with different mechanisms promote rock crack initiation and propagation;hence induced damages couple with each other,the coupling of the two will make the total damage deterioration. (3) Crack length and freeze-thaw cycles on total damage is larger;the influence of crack dip angle on the total damage is relatively small. (4) under the same cycles of freeze-thaw,damage degradation of cracking rocks is more serious than the intact samples.
李新平1,路亚妮1,2,王仰君1. 冻融荷载耦合作用下单裂隙岩体损伤模型研究[J]. 岩石力学与工程学报, 2013, 32(11): 2307-2315.
LI Xinping1,LU Yani1,2,WENG Yangjun1. RESEARCH ON DAMAGE MODEL OF SINGLE JOINTED ROCK MASSES UNDER COUPLING ACTION OF FREEZE-THAW AND LOADING. , 2013, 32(11): 2307-2315.
徐光苗,刘泉声. 岩石冻融破坏机制分析及冻融力学试验研究[J]. 岩石力学与工程学报,2005,24(17):3 076-3 082.(XU Guangmiao,LIU Quansheng. Analysis of mechanism of rock failure due to freezing-thawing cycling and mechanical testing study on frozen- thawed rocks[J]. Chinese Journal of Rock Mechanics and Engineering,2005,24(17):3 076-3 082.(in Chinese))
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