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用钻孔法测量地应力时,传感元件测量的是钻孔的径向位移,得到的数据是井下传感元件的电学值,目前采用的压磁型探头,得到的数据是元件的电感值。当元件夹角为45°时,由元件测值的变化来计算σ_1(最大主应力)、σ_2(最小主应力)和ψ(最大主应力方向)的公式如下υ: 元件测值的变化(L_2—L_1)除以元件的灵敏系数K得“记录应力值”S(K由实验室
When using borehole method to measure in-situ stress, the sensing element measures the radial displacement of the borehole. The data obtained is the electrical value of the sensing element in the well. The currently used piezomagnetic sensor obtains the inductance of the element . When the included angle is 45 °, the formula for calculating σ_1 (maximum principal stress), σ_2 (the smallest principal stress) and ψ (the direction of the maximum principal stress) is calculated from the variation of the measured value of the component. Υ: L_1) divided by the element’s sensitivity coefficient K “to record the stress value” S (K by the laboratory