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<p>Stratified rock mass widely occurs during the process of engineering construction. The weak regions in engineering mainly include bedding plane and crack network, whose mechanical properties have a significant impact on the stability of geotechnical engineering. By adopting 3D printing technology and the coupled finite-discrete element method, this study revolves around the combined effect of bedding plane and precast crack on the mechanical properties of stratified rock mass. It has overcome a set of challenges, such as difficulty in sampling stratified rock mass, low success rate of precast cracks within stratified rock mass, and difficulty in controlling the geometric parameters of stratified rock specimens (e.g., the dip angle of bedding plane, the dip angle of precast crack, the length of precast crack, etc.). Firstly, compression tests are conducted on 3D printed specimens under the conditions of different drying times, glue saturations, and gypsum powder filling degrees to study the macroscopic mechanical response characteristics of 3D printed specimens. Based on this, an optimized printing scheme is formulated to ensure that the mechanical properties of the printed specimens bear a close resemblance to those of natural rock. Secondly, the strength characteristics and crack propagation patterns of stratified rock mass are examined by conducting compression tests on specimens with precast crack and numerical simulation tests as the dip angle of bedding plane varies. Additionally, a detailed comparison is made concerning the differences in the mechanical properties between stratified rock mass with precast crack and those without precast crack. Finally, when the dip angle of bedding plane, the dip angle of precast crack and the length of precast crack undergo changes, numerical simulations of the compression process of specimens with precast crack are carried out to explore the influence of each dominant factor on crack initiation stress, peak strength, and crack initiation ratio. According to the results of orthogonal test, the sensitivity of each dominant factor to the mechanical properties of specimens with precast crack is carefully evaluated. The research findings would lay a crucial theoretical foundation for deformation control and stability analysis in engineering practice associated with stratified rock mass and provide reference for the application of 3D printing technology and FDEM algorithm to rock mechanics.</p>

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Study on the mechanical properties of stratified rock mass based on 3D printing technology and FDEM algorithm

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月9日

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  • Yongchao Tian,
  • Kaifang Ren,
  • Fan He,
  • Yong Liu,
  • Penghai Deng,
  • Jiaqi Guo,
  • Feiyue Sun,
  • Xin Huang,
  • Jun Zhang

摘要

Stratified rock mass widely occurs during the process of engineering construction. The weak regions in engineering mainly include bedding plane and crack network, whose mechanical properties have a significant impact on the stability of geotechnical engineering. By adopting 3D printing technology and the coupled finite-discrete element method, this study revolves around the combined effect of bedding plane and precast crack on the mechanical properties of stratified rock mass. It has overcome a set of challenges, such as difficulty in sampling stratified rock mass, low success rate of precast cracks within stratified rock mass, and difficulty in controlling the geometric parameters of stratified rock specimens (e.g., the dip angle of bedding plane, the dip angle of precast crack, the length of precast crack, etc.). Firstly, compression tests are conducted on 3D printed specimens under the conditions of different drying times, glue saturations, and gypsum powder filling degrees to study the macroscopic mechanical response characteristics of 3D printed specimens. Based on this, an optimized printing scheme is formulated to ensure that the mechanical properties of the printed specimens bear a close resemblance to those of natural rock. Secondly, the strength characteristics and crack propagation patterns of stratified rock mass are examined by conducting compression tests on specimens with precast crack and numerical simulation tests as the dip angle of bedding plane varies. Additionally, a detailed comparison is made concerning the differences in the mechanical properties between stratified rock mass with precast crack and those without precast crack. Finally, when the dip angle of bedding plane, the dip angle of precast crack and the length of precast crack undergo changes, numerical simulations of the compression process of specimens with precast crack are carried out to explore the influence of each dominant factor on crack initiation stress, peak strength, and crack initiation ratio. According to the results of orthogonal test, the sensitivity of each dominant factor to the mechanical properties of specimens with precast crack is carefully evaluated. The research findings would lay a crucial theoretical foundation for deformation control and stability analysis in engineering practice associated with stratified rock mass and provide reference for the application of 3D printing technology and FDEM algorithm to rock mechanics.