Development of Cross-Sectional Borehole Deformation Method (CBDM) for Measurement of Rock Stress Change

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Other Title
  • 岩盤応力変化測定のための孔壁変位測定法（ＣＢＤＭ）の開発
  • ガンバン オウリョク ヘンカ ソクテイ ノ タメノ コウヘキ ヘンイ ソクテイホウ CBDM ノ カイハツ
  • Development of cross-sectional borehole deformation method

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Abstract

Knowledge of rock stress, such as initial stress, induced stress and stress change, is one of fundamental importance for designing and constructing rock structure, since the mechanical behavior of rock mass around it is affected by these stresses. In order to measure initial stress and induced stress, many methods have been suggested. On the other hand, there are a few methods for stress change around an opening under construction. Only stress in one direction in a plane perpendicular to a borehole axis is measured in most measurements of stress change. Furthermore, the instrument for the measurement has a rigidity which affects on measured results. <BR>In this paper, a method for measurement of stress change is developed to monitor rock stress using a borehole. Two dimensional state of stress change within rock mass in a plane perpendicular to a borehole axis can be measured by this method. This method was named the Cross-sectional Borehole Deformation Method (CBDM) . Firstly, the theory of the CBDM is described, and the required specification of instrument for measurement is clarified by the theory of elasticity. Secondly, the prototype instrument with the laser displacement sensor is developed, based on the analysis of the required specification. Furthermore, the influence factors on measurement result are analyzed theoretically. As a result, it made clear that the rock stress change in a plane perpendicular to the borehole axis can be measured by the CBDM.

Journal

  • Journal of MMIJ

    Journal of MMIJ 127 (1), 20-25, 2010

    The Mining and Materials Processing Institute of Japan

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