Experimental study on compressive strength and fracture characteristics of sandstone containing double circular cavities

被引：0
|
作者：
Han G.-S. [1 ]
Jing H.-W. [1 ]
Su H.-J. [1 ]
Zhu T.-T. [2 ]
Du M.-R. [1 ]
Xiong F. [1 ]
Wu J.-Y. [1 ]
机构：
[1] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou
[2] School of Civil Engineering, Chongqing University, Chongqing
来源：
Meitan Xuebao/Journal of the China Coal Society | 2017年 / 42卷 / 04期
关键词：
Acoustic emission; Double circular cavities; Failure pattern; Rock mechanics; Strength parameters;
D O I：
10.13225/j.cnki.jccs.2016.0792
中图分类号：
学科分类号：
摘要：
A large number of micro cracks, holes and other defects appear in the rock material because of the complexity of its natural formation process. In order to study the interaction mechanism between the cavities and the effect of the cavities on the mechanical behavior of rock, the uniaxial compression tests were conducted on the sandstone samples with the different geometric arrangements of holes and the diameters of the side holes to obtain their strength, deformation and fracture evolution laws. The result demonstrates that both the peak strength and elastic modulus of the samples show the trend of first decrease then increase with the increase of the angle. The minimum and maximum values reach at α=30° and α=90°; the peak strength and elastic modulus show a gradually decrease with the increase of the diameter of the side hole. The damage form of the sandstone containing double circular cavities is affected by the angle and the side hole diameter, mainly in the three aspects of crack initiation forms of the samples, the fracturing behavior of the central hole and the coalescence mode of the double circular cavities. The interaction between the central hole and the side hole gradually increases and then gradually decreases with the increase of the angle, the increase of the diameter of the side hole can also enhance the interaction between the central hole and the side hole, and this has been confirmed in the void coalescence. © 2017, Editorial Office of Journal of China Coal Society. All right reserved.
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页码：871 / 878
页数：7
相关论文
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