兰州理工大学学报

兰州理工大学学报 ›› 2025, Vol. 51 ›› Issue (3): 113-118.

• 建筑科学 • 上一篇    下一篇

交叉裂隙倾角对砂岩力学性质及扩展破坏的影响

陈祥1, 肖桃李*1, 折海成1,2   

  1. 1.长江大学 城市建设学院, 湖北 荆州 4340230;
    2.陕西省油气井及储层渗流与岩石力学重点实验室, 陕西 西安 710065
  • 收稿日期:2022-01-13 出版日期:2025-06-28 发布日期:2025-06-30
  • 通讯作者: 肖桃李(1978-),男,湖北天门人,教授,博士.Email:200536@yangtzeu.edu.cn
  • 基金资助:
    湖北省自然科学基金(2024AFB878),陕西省混凝土结构安全与耐久性重点实验室开放基金(SZ02105),陕西省油气井及储层渗流与岩石力学重点实验室开放基金(WSFRM20210101001)

Effect of cross fracture angle on mechanical properties and damage propagation failure of sandstone

CHEN Xiang1, XIAO Tao-li1, SHE Hai-cheng1,2   

  1. 1. School of Urban Construction, Yangtze University, Jingzhou 434023, China;
    2. The key laboratory of well stability and fluid & rock mechanics in oil and gas reservoir of Shaanxi Province, Xi’an 710065, China
  • Received:2022-01-13 Online:2025-06-28 Published:2025-06-30

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摘要： 交叉裂隙作为裂隙岩体中常见的形式之一,其交叉几何属性影响着岩体扩展破坏及灾变机理.以含单一组交叉裂隙岩样为研究对象,重点探讨了主、次裂隙倾角对岩样的力学性质和扩展破坏规律.结果表明:当主裂隙倾角小于等于45°时,主裂隙沿水平方向投影长度大于次裂隙,主裂隙倾角对岩样的峰值强度和弹性模量影响较大;当主裂隙倾角大于45°时,次裂隙向水平方向投影长度较大,次裂隙倾角对岩样峰值强度和弹性模量的影响较大.岩样表面宏观裂纹扩展主要以主裂隙尖端和次裂隙尖端裂纹为主,远场裂纹和表面剥落较少.岩样破坏模式受主、次裂隙向水平方向投影长度控制,即主裂隙投影长度大于次裂隙时,破坏由主裂隙控制,反之则由次裂隙控制.

关键词: 交叉裂隙, 裂纹扩展, 破坏模式

Abstract: Cross crack, as one of the common forms of fractured rock mass, the overlapping geometry properties affect the expansion damage of rock mass and the catastrophe mechanism. Taking rock samples containing a single group of cross fractures as the research object, the mechanical properties and propagation failure laws of rock samples affected by the dip angles of primary and secondary fractures are emphatically discussed. The results show that: when the inclination angle of the primary fracture is less than or equal to 45°, the horizontal projection length of the primary fracture is larger than that of the secondary fracture, and the inclination angle of the primary fracture has a great influence on the peak strength and elastic modulus of the rock sample. When the inclination angle of the primary fracture is greater than 45°, the horizontal projection length of the secondary fracture is larger, and the inclination angle of the secondary fracture has a great influence on the peak strength and elastic modulus of the rock sample.The macroscopic crack propagation on the surface of rock samples is mainly characterized by the cracks at the primary crack tip and the secondary crack tip, while the far-field cracks and surface spalling are less.The failure mode of rock samples is controlled by the horizontal projection length of the primary and secondary fractures, that is, when the projection length of the primary fracture is larger than the secondary fracture, the failure is controlled by the primary fracture. Otherwise, it is controlled by the secondary fracture.

Key words: cross crack, crack propagation, failure mode

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