DEM simulations on wave propagation around a subsurface cavity influenced by force chains

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  • NAKATA Yusuke
    大成建設株式会社（元東京大学　工学系研究科　大学院学生）
  • ALI Umair
    元東京大学　工学系研究科　大学院学生
  • KUWANO Reiko
    東京大学生産技術研究所　人間・社会系部門
  • OTSUBO Masahide
    東京大学生産技術研究所　人間・社会系部門

Bibliographic Information

Other Title
  • 地中空洞まわりの応力伝達経路の影響を考慮したDEM弾性波伝播解析
  • チチュウ クウドウマワリ ノ オウリョク デンタツ ケイロ ノ エイキョウ オ コウリョ シタ DEM ダンセイハ デンパ カイセキ

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Abstract

<p>Subsurface cavities potentially cause a catastrophic consequence, such as road cave-in. As a countermeasure, groundpenetrating radar method has been used to find subsurface cavities in shallow ground, whereas no established method is available to detect a cavity in deep ground. To understand micromechanics of wave propagation around a cavity, discrete element method (DEM) simulations were performed. The DEM analyses revealed that P-waves propagate faster along soil arching, whereas S-wave velocity is less sensitive to soil arching. Overall, both P- and S-wave velocities decreased due to loosening of soil where number of contacts per particle dropped in the vicinity of the cavity.</p>

Journal

  • SEISAN KENKYU

    SEISAN KENKYU 72 (6), 397-400, 2020-11-01

    Institute of Industrial Science The University of Tokyo

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