Scholarlink

<p>To investigate the Brazilian splitting mechanical response and crack evolution pattern of different types of rock under different loading fixtures as well as the behaviour of multi-fractured rock tested under the same test fixture, this study employed secondary development of ABAQUS software using Python programming to globally embed cohesive elements into solid elements. Laboratory Brazilian tests and digital image correlation (DIC) tests were carried out using a GCTS rock testing system (RTR-1000), and the results of these tests were used to verify the numerical simulation results. Numerical simulation studies were subsequently performed under multiple working conditions. (1) With respect to limestone and granite, the variation trends of the stress‒strain curves and the failure process generated by numerical simulations are highly consistent with those obtained from laboratory tests. (2) Under the action of flat loading fixtures, point loading fixtures, and arc loading fixtures, cracks in both limestone and granite initiate at positions approximately 0.66R–0.86<i>R</i> above or below the specimen centre (where <i>R</i> represents the radius), with the initiation dominated by a tension‒shear composite mode. (3) The crack propagation modes of the multifractured limestone and granite exhibit a “two-stage”–“three-stage”–“two-stage” pattern with variations in the fracture dip angle. At different crack dip angles, the main cracks of both the limestone and the granite initiate at or near the lower left side of Fracture 3 and extend along the loading direction. The findings of this study provide an important reference for elucidating the Brazilian rock splitting behaviour and improving the safety assessment of rock mass engineering projects.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mechanical behavior and fracture mechanism of rock under Brazilian splitting test via the FEM-CZM method

  • 期刊论文

  • 发表日期：

    2026年5月7日

查看全文
  • Zhang Huijian,
  • Liu Yongde,
  • Zhou Xuemin,
  • Wang Fei,
  • Chen Zekun

摘要

To investigate the Brazilian splitting mechanical response and crack evolution pattern of different types of rock under different loading fixtures as well as the behaviour of multi-fractured rock tested under the same test fixture, this study employed secondary development of ABAQUS software using Python programming to globally embed cohesive elements into solid elements. Laboratory Brazilian tests and digital image correlation (DIC) tests were carried out using a GCTS rock testing system (RTR-1000), and the results of these tests were used to verify the numerical simulation results. Numerical simulation studies were subsequently performed under multiple working conditions. (1) With respect to limestone and granite, the variation trends of the stress‒strain curves and the failure process generated by numerical simulations are highly consistent with those obtained from laboratory tests. (2) Under the action of flat loading fixtures, point loading fixtures, and arc loading fixtures, cracks in both limestone and granite initiate at positions approximately 0.66R–0.86R above or below the specimen centre (where R represents the radius), with the initiation dominated by a tension‒shear composite mode. (3) The crack propagation modes of the multifractured limestone and granite exhibit a “two-stage”–“three-stage”–“two-stage” pattern with variations in the fracture dip angle. At different crack dip angles, the main cracks of both the limestone and the granite initiate at or near the lower left side of Fracture 3 and extend along the loading direction. The findings of this study provide an important reference for elucidating the Brazilian rock splitting behaviour and improving the safety assessment of rock mass engineering projects.