[1]康亚明,贾延,罗玉财,等.三轴压缩时岩石破裂面方位角理论值与实验值研究[J].西安建筑科技大学学报(自然科学版),2017,49(05):665-0670.[doi:10.15986/j.1006-7930.2017.05.008]
　KANG Yaming,JIA Yan,LUO Yucai,et al.Research on the heoretical and experimental value of azimuth angle of the fracture surface for the rock subjected to triaxial Compression[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2017,49(05):665-0670.[doi:10.15986/j.1006-7930.2017.05.008]
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三轴压缩时岩石破裂面方位角理论值与实验值研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
49
期数:
2017年05期
页码:
665-0670
栏目:
出版日期:
2017-10-28

文章信息/Info

Title:
Research on the heoretical and experimental value of azimuth angle of the fracture surface for the rock subjected to triaxial Compression
文章编号:
1006-7930(2017)05-0665-07
作者:
康亚明1; 贾延2; 罗玉财1; 陈静波3
(1:北方民族大学化学与化学工程学院,宁夏 银川 750021;2:北方民族大学数学与信息科学学院,宁夏 银川 750021;3:宁夏旭日众粒环保科技有限公司,宁夏 银川 750200)
Author(s):
KANG Yaming1;  JIA Yan2;  LUO Yucai1;  CHEN JINGbo3
(1School?of?Chemistry?and Chemical Eng. , North Minzu University, Yinchuan 750021,China2School of Mathematics and Information Science, North Minzu UniversityYinchuan 750021,China; 3: Ningxia XU RI ZHONG LI environmental protection technology co., LTD, Yinchuan 750200,China )
关键词:
岩石力学; 三轴压缩; 莫尔-库仑准则; 破裂形态; 边界条件; 应力集中; 剪切带
Keywords:
rock mechanics;  triaxial compression;  Mohr-Coulomb criterion;  fracture morphology;  boundary condition ;  stress concentration;  shear zone
分类号:
TU451
DOI:
10.15986/j.1006-7930.2017.05.008
文献标志码:
A
摘要:
考虑边界条件对试样破裂路径的影响，分析了粗砂岩理论破裂面与实际破裂面不一致的机理，并在莫尔-库仑准则下对比了不同破裂面上强度差异的机制，结果表明：莫尔-库仑准则下粗砂岩的破裂面方位角理论值在67.45°附近，但实际破裂面被边界约束限制在了对角线所在的63°附近，而不同剪切破裂面上对应着不同的强度，破裂面理论值与真实值的不一致最终影响了强度，导致实验值比理论值偏大，且这种偏离随围压的增大而增大.消除这种差异可以通过增大试件高径比来实现，而国内普遍采用国标（GB/T 502662013）推荐值的下限，也即二倍高径比的圆柱试件，建议国内岩石强度试验采用国标推荐值的上限（25∶1），既可以消除端部约束对真实强度的影响，也与国际岩石力学学会推荐值更加接近.
Abstract:
Considering the influence of boundary condition on the rupture path of the drill core, the mechanism of inconformity of the theoretical and experimental fracture surface was analyzed, and the mechanism of the strength difference of different fracture surfaces was compared under the Mohr-Coulomb criterion. The results showed that the theoretical value of the fracture surface azimuth of the coarse sandstone under the Mohr-Coulomb criterion is near 67.45°, but the actual fracture surface was restricted by the boundary constraint at the 63° (namely near the diagonal) . However, the different shear fracture surfaces corresponded to the different strength, so the inconsistency between the theoretical and experimental fracture surface will affect the strength ultimately. This inconformity made the experimental value was larger than the theoretical value, and this deviation tendency enlarged with the increase of confining pressure. The elimination of this difference can be realized by increasing the ratio of height to diameter, but the lower limit of the recommended value of the national standard (GB/T 50266-2013) is widely used in China at present, that is the cylinder specimen that the height to width ratio is 2:1. It is suggested that the rock strength test is based on the upper limit (2.5:1) of the national standard of China. It can eliminate the influence of end constraints on real strength, and also it is more close to the recommended values of the International Institute of rock mechanics

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备注/Memo

备注/Memo:
收稿日期：2016-11-03 
修改稿日期:2017-08-25
基金项目:国家自然基金资助项目（51369001;51569001）
第一作者:康亚明（1980-），男，博士，副教授，主要从事脆性材料断裂与损伤的研究. E-mail: scu.kym@foxmail.com
更新日期/Last Update: 2017-11-09