非贯通裂隙岩体力学特性的损伤力学分析  

STUDY ON THE MECHANICAL CHARACTERISTICS OF INTERMITTENTLY CRACKED ROCK MASSES WITH DAMAGE MECHANICS

作　　者：凌建明[1] 蒋爵光[1] 傅永胜 

机构地区：[1]西南交通大学

出　　处：《岩石力学与工程学报》1992年第4期373-383,共11页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金

摘　　要：本文基于岩石应力-应变全过程曲线及其对应的声发射试验结果,以及岩石在加载条件下损伤的产生与演化的微观试验和三种不同应力条件下非贯通裂隙岩体模型的强度、变形破坏试验的结果,分析了非贯通裂隙岩体损伤的宏观力学响应和岩体损伤机制;探讨了岩体损伤的局部性及其力学效应。由大量模型试验。通过引入“局部损伤修正系数”,建立了非贯通裂隙岩体考虑损伤的强度预测公式,并用此公式预测了一些模型的三轴强度,结果与实测强度吻合较好。To master the damage mechanics characteristics of intermittently cracked rock mass, the authors performed some tests: (1)tests for determining the complete σ-ε_1 curve of brittle rock, (2)AE monitoring of marble, (3)microscopic investigation on damage initiation and evolution in rock materials during loading, and (4)model test of intermittently cracked rock mass under various stress conditions. Based on the test results mentioned above, this paper analyses the damage mechanism of intermittently cracked rock mass and its macromechanical response, and presents the characteristics of local damage in rock masses and its mechanical effect. On the basis of the test data and the introduction of a 'modifying coefficient of local damage', a strength predicting equation which takes damage into consideration is proposed for intermittently cracked rock masses. The triaxial strength predicted using the equation tallies well with test results.

关 键 词：非贯裂隙岩体 损伤力学 

分 类 号：TU452[建筑科学—岩土工程]