METHOD FOR INITIAL ROCK STRESS MEASUREMENT AND APPARATUS THEREFOR

摘要

According to the present invention, there is provided a method of measuring an initial stress of a rock, comprising the steps of drilling a first borehole in a subject and drilling a second borehole having a diameter smaller than that of the first borehole in a joint of the first borehole; Inserting in the second borehole a plurality of strain gauges for three dimensional stress measurement; a data storage module and a battery for storing the measurements of the plurality of strain gauges; Fixing the measurement probe to the second bore hole such that the plurality of strain gauges are in close contact with the air bore of the second bore hole and performing switching of the strain gauge to start measurement of the strain gauge; Separating a cable connected to the measurement probe; Performing overcooring around the second bore hole; And separating and recovering the stressed core sleeve by the overcoring and calculating local stress through the results stored in the data storage module.;