冻融荷载耦合作用下单裂隙岩体损伤模型研究

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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.

Key words： rock mechanics freeze-thaw uniaxial compression coupling effect jointed rock masses damage evolution model

Received: 21 May 2013

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http://www.rockmech.org/EN/Y2013/V32/I11/2307

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