长江科学院院报 ›› 2014, Vol. 31 ›› Issue (11): 26-30.DOI: 10.3969/j.issn.1001-5485.2014.11.0062014,31(11):26-30

• 岩石力学特性与试验 • 上一篇    下一篇

非均匀介质在动荷载作用下的裂缝扩展研究

钟波波,张永彬,白象元,李宏   

  1. 大连理工大学 土木工程学院,辽宁 大连 116024
  • 收稿日期:2014-08-02 修回日期:2014-11-05 出版日期:2014-11-01 发布日期:2014-11-05
  • 作者简介:钟波波(1990-),男,山西大同人,硕士研究生,研究方向为岩石破裂与失稳,(电话)18018985202(电子信箱)ytgczbb@163.com。
  • 基金资助:
    国家重点基础研究发展计划(973)项目(2011CB013503, 2014CB047100);国家自然科学基金(51274053)

Crack Propagation Mechanism of Inhomogeneous Medium under Dynamic Load

ZHONG Bo-bo,ZHANG Yong-bin,BAI Xiang-yuan,LI Hong   

  1. School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2014-08-02 Revised:2014-11-05 Online:2014-11-01 Published:2014-11-05

摘要: 运用岩石破裂过程分析软件RFPA-dynamic,通过对模型预置一组裂纹,研究裂纹倾角、岩桥倾角及双向荷载对裂纹扩展方式的影响。结果表明①单向动荷载作用下,裂纹倾角和岩桥倾角对裂纹扩展方式几乎没有影响,裂纹大致沿与荷载垂直的方向扩展;②单向动荷载作用下,声发射释放累积能量的过程大致分为4个阶段;③双向动荷载作用下,随着荷载比率的减小,裂纹的弯曲弧度增大,逐渐与水平荷载垂直;④双向动荷载作用下,岩桥倾角一定时,随着裂纹倾角的增大,裂纹扩展偏向竖直方向;⑤单向静荷载作用下,裂纹倾角和岩桥倾角对裂纹扩展方式有显著影响,而单向动荷载作用下,其对裂纹扩展方式却几乎无影响。

关键词: 岩石力学, 非均匀介质, 动态荷载, 裂纹扩展, 数值模拟

Abstract: The influences of crack inclination angle, rock bridge’s inclination angle and biaxial load on rock crack propagation mode were studied by using Rock Failure Process Analysis(RFPA-dynamic) on rock samples with pre-existing cracks. The results show that 1) under uniaxial dynamic load, crack inclination angle and rock bridge's inclination angle have little effect on crack propagation , and the crack expands in the direction perpendicular to load; 2) the release of accumulated energy of acoustic emission can be divided into four stages under axial dynamic load; 3) under biaxial load, along with the decrease of load ratio, the bending radian of crack increase and the crack is gradually perpendicular to the horizontal load; 4) when the inclination angle of rock bridge is constant with the increase of crack inclination angle, crack tends to the vertical direction under biaxial dynamic load; 5) under uniaxial static load, crack inclination angle and rock bridge’s inclination angle have significant effect on crack propagation mode but have little effect under uniaxial dynamic load.

Key words: rock mechanics, inhomogeneous medium, dynamic load, crack propagation, numerical simulation

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