An evaluation method of rock brittleness based on the whole process of elastic energy evolution

被引：0
|
作者：
Chen G. [1 ]
Wu J. [1 ]
Jiang W. [1 ]
Li S. [2 ]
Qiao Z. [3 ]
Yang W. [3 ]
机构：
[1] State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, Sichuan
[2] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, Hubei
[3] China Railway 12 Bureau Group Co., Ltd., Taiyuan, 030024, Shanxi
来源：
| 1600年 / Academia Sinica卷 / 39期
基金：
中国国家自然科学基金;
关键词：
Energy evolution; Post-peak elastic energy-releasing rate; Pre-peak elastic energy accumulating rate; Rock brittleness evaluation; Rock mechanics;
D O I：
10.13722/j.cnki.jrme.2019.0778
中图分类号：
学科分类号：
摘要：
Brittle failure is an important mechanical behavior of rocks, and hence, it is of great significance to establish an accurate brittle evaluation method for rock engineering. Due to that the evolution characteristics of the elastic energy stored in rock before the peak directly determine the property of brittle failure after the peak, in this paper, a brittleness evaluation index based on the whole process of elastic energy evolution was proposed by comprehensively considering the characteristics of pre-peak elastic energy accumulating and post-peak elastic energy releasing. The brittleness evaluation index was used to evaluate the brittleness characteristics of different rocks under uniaxial compression, conventional triaxial compression and hydrostatic pressure conditions. The results show that the brittleness evaluation index established in this paper can fully reflect the brittleness characteristics of rocks. This index can accurately evaluate the difference of brittle characteristics of all kinds of rocks under the condition of uniaxial compression. The accumulating rate of the pre-peak elastic energy and the dissipating rate of the post-peak elastic energy of marble and quartz sandstone decrease with increasing of the confining pressure under the condition of conventional triaxial compression. It is also shown that the brittleness index of quartz sandstone increases with increasing the water pressure and the influence of the water pressure on brittleness index decreases gradually with rising the confining pressure. The rationality of the index was verified by the experimental results. The research work enriches the evaluation method of rock brittleness. © 2020, Science Press. All right reserved.
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页码：901 / 911
页数：10
相关论文
共 37 条
  • [1] ZHANG Jingjian, FU Bingjun, Rockburst and its criteria and control, Chinese Journal of Rock Mechanics and Engineering, 27, 10, pp. 2034-2042, (2008)
  • [2] BECK D A, BRADY B H G., Evaluation and application of controlling parameters for seismic events in hard-rock mines, International Journal of Rock Mechanics and Mining Sciences, 39, 5, pp. 633-642, (2002)
  • [3] SUN Jianmeng, HAN Zhilei, QIN Ruibao, Et al., Log evaluation method of fracturing performance in tight gas reservoir, Acta Petrolei Sinica, 36, 1, pp. 74-80, (2015)
  • [4] WANG Sheng, LIU Bo, FU Xiaofei, Et al., Evaluation of the brittleness and fracturing characteristics for tight clastic reservoir, Oil and Gas Geology, 39, 6, pp. 1270-1279, (2018)
  • [5] ZOU Caineng, YANG Zhi, ZHANG Guosheng, Et al., Conventional and un-conventional petroleum "orderly accumulation": Concept and practical significance, Petroleum Exploration and Development, 41, 1, pp. 14-27, (2014)
  • [6] MORLEY A., Strength of materials, pp. 71-72, (1944)
  • [7] HETENYI M., Handbook of experimental stress analysis, pp. 23-25, (1966)
  • [8] RAMSAY J G., Folding and fracturing of rocks, pp. 44-47, (1967)
  • [9] OBERT L, DUVALL W I., Rock mechanics and the design of structures in rock, pp. 78-82, (1967)
  • [10] TARASOV B G, RANDOLPH M F., Superbrittleness of rocks and earthquake activity, International Journal of Rock Mechanics and Mining Sciences, 48, 6, pp. 888-898, (2011)
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