基于新型茂木式试验机的真三轴试验及加载边界效应研究

doi:10.13722/j.cnki.jrme.2014.0341

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摘要介绍新研制的茂木式岩石真三轴试验机，并利用互扣式端部垫块对大理岩进行真三轴试验。利用试验和模拟相结合方法对真三轴试验机的加载边界效应进行研究。研究表明：随中间主应力的增大，岩石峰值强度增大，达到一定值后随着中间主应力的增大而减小；同时，岩样脆性随中间主应力的增大而增强，扩容现象延后。传统式垫块加载真三轴试验过程中，由于空白角的存在，产生应力集中，对岩样应力、应变分布造成明显影响，岩样将在空白角处产生不均匀变形。岩样在互扣式垫块加载方式下的强度略大于在传统式垫块加载方式下的强度。

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关键词 ：岩石力学, 真三轴试验, 边界效应, 空白角效应, 端部垫块

Abstract：A new developed Mogi-type true triaxial test apparatus was introduced. True triaxial tests for marble with mutually overlapping platens were presented. True triaxial tests and three dimensional FE modelling study were carried out on the loading boundary effect. The results indicate that the peak value of strength increases with the ?2(intermediate principal stress). When the strength reaches its maximum value，it tends to decrease. The brittleness increases with increasing ?2. The intermediate principal stress retards the dilatancy onset. The influence of corner effect on the stress and strain distributions of rock specimen subjected to the traditional platens is apparent in true triaxial test due to stress concentration in the corner. And the strength of rock specimen subjected to the mutually overlapping platens is a bit larger than that subjected to traditional platens.

Key words： rock mechanics true triaxial test boundary effect the corner effect end platens

引用本文:

何浩宇，石露，李小春，白冰. 基于新型茂木式试验机的真三轴试验及加载边界效应研究[J]. 岩石力学与工程学报, 2015, 34(s1): 2837-2844.
HE Haoyu，SHI Lu，LI Xiaochun，BAI Bing. TRUE TRIAXIAL TESTS WITH NEW MOGI-TYPE TRUE TRIAXIAL TEST APPARATUS AND ITS LOADING BOUNDARY EFFECT. , 2015, 34(s1): 2837-2844.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0341 或 http://www.rockmech.org/CN/Y2015/V34/Is1/2837

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