PROBLEM TO BE SOLVED: To provide an in situ shear strength measuring device capable of easily measuring the in situ shear strength of a rock or a soil ground by simple structure. SOLUTION: This in situ shear strength measuring device 1 comprises a measuring bar 3 formed in a bar shape and driven into a body M to be measured, an extraction unit 5 for extracting the measuring bar 3 driven in to the body M, and a measuring unit 6 for measuring the displacement of the measuring bar 3 and a load (shearing force) required for the extraction when the measuring bar 3 is extracted from the body M. Irregularity along the axial direction is continuously formed on the periphery of the measuring bar 3. COPYRIGHT: (C)2008,JPO&INPIT
