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In situ stress measurement by the stress relief technique using a multi-component borehole instrument

机译：使用多组分钻孔仪器通过应力消除技术进行原位应力测量

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We have developed a two-dimensional method for calculating principal stresses on a plane by measuring strain changes obtained by the stress relief technique using a multi-component borehole instrument. If the ratio of the radius of the core to that of the borehole is 1.4-2.0, a uniform strain change occurs in any stress field due to the overcoring. It is therefore desirable that the radius of the core obtained by overcoring is larger than that of the borehole by a few orders of magnitude. We applied the proposed calculation method to a stress measurement performed at the Hishikari mine, southwest Japan. The maximum and minimum principal stresses were determined to be 5.0 and -0.2 MPa, respectively. The nearly vertical stress was estimated to be 1.5 MPa, which was merely 30% of the predicted vertical stress (5.6 MPa). One of causes of the small vertical stress obtained in this study is considered to be the limitation of the two-dimensional method for calculating principal stresses.
机译：我们已经开发了一种二维方法，用于通过测量应力消除技术（使用多分量钻孔仪器）获得的应变变化来计算平面上的主应力。如果岩心半径与井眼半径之比为1.4-2.0，则由于过度取心，在任何应力场中均会发生均匀的应变变化。因此，期望通过过度取芯获得的岩心半径比钻孔的半径大几个数量级。我们将拟议的计算方法应用于在日本西南部Hishikari矿进行的应力测量。确定的最大和最小主应力分别为5.0和-0.2 MPa。估计的垂直应力约为1.5 MPa，仅为预测垂直应力（5.6 MPa）的30％。本研究中获得的较小垂直应力的原因之一被认为是二维计算主应力的方法的局限性。

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