双衬套钻孔应变测量的计算
CALCULATIONS OF STRAIN OBSERVATION IN THE BOREHOLE WITH TWO CASES
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摘要: 本文讨论了在双层衬套钻孔中进行地壳应变测量的有关问题,阐述了钻孔径向测量的物理意义。推导了在外应力作用下,钻孔衬套内壁的径向位移和体积应变的计算公式,以及在起潮力作用下,双衬套钻孔中应变理论值的计算方法。同时,还给出了依据水平面内三个不同向元件的测值变化,求取被测地区附加主应力大小和方向的计算公式。Abstract: In this paper, the problems about strain observation in a borehole with two cases have been discussed. The physidal sense of rhdial observation in the borehole is described. The authors derived the expressions for radial displasment and volume strain on the interior wall of the bore hole case due to the external stresses. We gave the calculating method of the theoretical values of strain in the borehole under the tide generating forces and the formulas for calculating the values and the directions of additional principal stresses in the observed regions, according to the variation of observation values of three elements in different directions at the horizontal plane.
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