大尺寸试件岩爆试验碎屑分形特征分析

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摘要通过自主研发的岩爆模拟试验装置对大尺寸试件进行岩爆试验，研究不同加卸载路径下产生岩爆碎屑的质量和形状分布特征，探讨试件发生岩爆的烈度与碎屑分形维数的关系。结果表明：(1) 大尺寸试件在不同加卸载条件下产生的碎屑形状分布不同，碎屑量不同；(2) 大尺寸试件岩爆的碎屑具有分形特征；(3) 试件在低围压环境卸载时，岩爆碎屑的分形维数值比其在高围压环境下卸载时的大，岩爆储存能量相对较少，岩爆烈度相对也小；(4) 在相同围压下卸载时，试件所受的竖向加载速率越大，试件产生的岩爆范围相对越小，试件岩爆时所受竖向荷载值相对越小，岩爆碎屑的大块率相对越少，分形维数值相对越大。

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关键词 ：岩石力学, 大尺寸试件, 岩爆试验, 岩爆烈度, 分形维数, 碎屑分形特征

Abstract：Rockburst tests on specimens of large-diameter using the device developed were carried out under different loading and unloading conditions. The weight distribution and the fractal characteristics of rock fragments after rockburst，and the relationship between the rockburst intensity and the fractal characteristics were studied. The fragments from specimens of large-diameter after each test were found to have different shapes and quantities. The fragments from specimens of large-diameter have fractal characteristics. The fractal dimension of fragments from the unloading tests of low confining pressure is larger than that of high confining pressure. Accordingly，the dissipation energy required is comparatively smaller and the intensity of rockburst produced is relatively smaller. The range of rockburst decreases as the increasing of the loading rate if the confining pressure is the same. The number of fragments of large size is small if the vertical loading is small，while the fractal dimension is larger.

Key words： rock mechanics specimens of large-diameter rockburst test intensity of rockburst fractal dimension fractal characteristics of fragments

收稿日期: 2013-07-20

引用本文:

夏元友1，吝曼卿1，廖璐璐1，熊文2，王智德1. 大尺寸试件岩爆试验碎屑分形特征分析[J]. 岩石力学与工程学报, 2014, 33(7): 1358-1365.
XIA Yuanyou1，LIN Manqing1，LIAO Lulu1，XIONG Wen2，WANG Zhide1. FRACTAL CHARACTERISTIC ANALYSIS OF FRAGMENTS FROM ROCKBURST TESTS OF LARGE-DIAMETER SPECIMENS. , 2014, 33(7): 1358-1365.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/I7/1358

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