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用USBM钻孔变形计测量岩石应力此法旨在根据套孔法测量时中心孔径的变化来确定岩石应力,并根据弹性性质和变形测量结果计算垂直于孔轴平面内的应力,岩心的长度必须至少是套孔直径的两倍。测孔深度一般不大于30米,但垂直向下孔的测量深度已达70米。根据测量结果可求出垂直于钻孔平面内的应力分量。井下在单孔中进
Rock Stress Measurement with a USBM Drill Deformer This method aims to determine the rock stress based on the change in the center hole diameter measured by the sleeve method and to calculate the stress perpendicular to the plane of the hole based on the elastic properties and deformation measurements. The core length must be at least Is twice the diameter of the sleeve hole. Hole depth measurement is generally not more than 30 meters, but the vertical down hole measurement depth has reached 70 meters. According to the measurement results can be obtained perpendicular to the drilling plane stress components. Downhole in a single hole into