Problem to be solved: to provide a method of accurately measuring a three-dimensional stress element acting on a ground at a predetermined depth through a slope well.In the well formed by excavating the groundThe ground located at a prescribed depth from the ground surface is removed from the inner surface of the well.Columnar side wall coreTo the side wall coreAt least the first to be separated in the longitudinal directionSet the second and third measurement sectionsThese firstThe dimensions of the second and third measuring sections are measured to measure the maximum diameter of the measured diameters for the reference circle diameter of each measurement sectionAnd the minimum diameter of the smallest strain amount to the reference circle diameter is collectedAn equation representing the difference between the maximum stress and the minimum stress acting on the sidewall core along each measurement cross sectionThe equation of the angle between the excavation direction of the well and the direction of action of the maximum stress in each measurement sectionSix independent components of the stress tensor are obtained.Diagram
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