ケーブルボルトの構成方程式と支保設計への適用

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  • Constitutive Law of Fully-Grouted Cable Bolts and Its Application to Support Design
  • ケーブルボルト ノ コウセイ ホウテイシキ ト シホセッケイ エ ノ テキヨウ

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As a fundamental study for support design of underground space using cable bolt, a series of laboratory pull-out tests with fully-grouted seven-wire plane and bulb strand cable bolt were conducted. Based on the test results, a constitutive law is suggested using Shear Resistance Model (SRM) . The resistance shear stress is induced between cable bolt and grout annulus due to bond failure in this model. Its value is mainly dependent on Young's modulus of surrounding rock mass and is formularized as a power function of Young's modulus of rock mass.<BR>Showing the simulations of the laboratory pull-out tests is successfully performed using the SRM, it is confirmed that the SRM is appropriate for explaining the pull-out behavior of cable bolts.<BR>Finally the SRM is applied to the support design of cable bolt for rock mass with various Young's modulus. Then the effect of the embedment length of cable bolt and Young's modulus of rock mass on the pull-out load and the region of resistance are shown. Then the method of support design using the SRM is discussed.

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  • 資源と素材

    資源と素材 126 (7), 432-439, 2010

    一般社団法人 資源・素材学会

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