INITIAL STRESS MEASURING MEANS USING OVERCORING AND ROCK BED INITIAL STRESS MEASUREMENT METHOD USING SAME

摘要

The present invention relates to initial stress measuring means capable of accurately measuring rock bed initial stress with improved means and methods applied to be capable of measuring a multi-axis strain with accuracy. The present invention provides initial stress measuring means including a piston unit (200) having a rod portion (220) that is inserted into one side of a drilling hole and is in contact with an end portion side and a body that is formed to extend to the other side of the rod portion; a body portion (100) having an accommodating portion (120) where a body of the piston unit is inserted into an inner circumferential side and a plurality of strain gauges (300) that are arranged in a circumferential direction and are oriented to have at least three angles with respect to a central axis; a cable (130) that extends to the other side of the body portion and outputs strain gauge detection signals to the outside; a first sealing unit (110) that has the shape of a ring which is formed to protrude in an outer circumferential direction on the other side of the body portion and has a radius corresponding to an inner circumference of the drilling hole; and a second sealing unit (210) that has the shape of a ring which is formed to protrude in an outer circumferential direction on one side of the body of the piston unit and allows a curing material to be injected between the second sealing unit and the first sealing unit. Accordingly, accurate fixing with respect to the drilling hole is possible and the strain with respect to multiple directions can be accurately measured.;COPYRIGHT KIPO 2014