含双圆形孔洞砂岩单轴压缩力学特性试验研究

朱谭谭; 靖洪文; 苏海健; 尹乾; 杜明瑞

doi:10.11779/CJGE201506011

含双圆形孔洞砂岩单轴压缩力学特性试验研究 English Version

中国矿业大学深部岩土力学与地下工程国家重点实验室, 江苏徐州 221116

基金项目: 国家重点基础研究发展计划（973 计划）项目（2013CB036003）；国家自然科学基金项目（51374198）；江苏省普通高校研究生科研创新计划项目（CXZZ13_0935, SJLX_0637）

详细信息

作者简介:
朱谭谭(1989– ), 男, 硕士, 主要从事岩石力学与工程等方面的研究。E-mail: zhutantan01@126.com。

中图分类号: TU458
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出版历程
- 收稿日期: 2014-08-15
- 发布日期: 2015-06-18

Mechanical behavior of sandstone containing double circular cavities under uniaxial compression

State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China

摘要

摘要: 孔洞作为岩石内部微缺陷的基本形式之一, 其破裂演化机制是岩石力学领域研究的重要课题。对预制双圆形孔洞的板状砂岩试样进行室内单轴压缩试验, 研究孔心距2b和倾角α对砂岩强度、变形特征及破裂演化过程等的影响规律。试验结果表明：随孔心距2b的增大, 试样的峰值强度和弹性模量均表现为先增大后又减小的特征, 孔心距2b分别为22mm和27mm时峰值强度和弹性模量达到最大值；随倾角a的增大, 峰值强度和弹性模量整体表现为先减小后增大的趋势, 倾角α等于60°时峰值强度和弹性模量达到最小值。双圆形孔洞的初始破坏均表现为孔洞内壁塌落破坏, 而孔心距2b和倾角α对起裂应力水平、孔洞搭接方式及破裂演化过程均具有重要的影响。
- 双圆形孔洞 /
- 强度特征 /
- 破裂演化过程 /
- 起裂应力水平
Abstract: Hole is one of the basic forms of micro defects in rock, and its fracture evolution mechanisms have become an important research subject in the field of rock mechanics. The uniaxial compression tests on tabular sandstone samples with pre-existing double circular cavities are conducted in order to investigate the effect of circle center distance 2b and angle α on strength, deformation and fracture evolution process of sandstone. The results show that both the peak strength and the elastic modulus of sandstone increase first and then decrease with the increase of the circle center distance 2b, and the peak strength and the elastic modulus reach their maximum values respectively when the circle center distance is 22 and 27 mm. With the increase of angle α, both the peak strength and the elastic modulus first decrease and then increase, and both of them reach the minimum values when the angle is 60°. The initial damage forms of the double circular cavities samples are all the collapsing destruction from the inner wall of the holes, and both the circle center distance and the angle have great influences on the stress levels of crack initiation, lap ways of holes and fracture evolution process.
- double circular cavity /
- strength characteristic /
- fracture evolution process /
- crack initiation stress level

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参考文献(18)

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含双圆形孔洞砂岩单轴压缩力学特性试验研究 English Version

作者简介: 朱谭谭(1989– ), 男, 硕士, 主要从事岩石力学与工程等方面的研究。E-mail: zhutantan01@126.com。

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Mechanical behavior of sandstone containing double circular cavities under uniaxial compression

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作者简介:
朱谭谭(1989– ), 男, 硕士, 主要从事岩石力学与工程等方面的研究。E-mail: zhutantan01@126.com。