CURRENT EQUIPMENT OF MEASURING AND COMPUTING COMPLEX “GIDRORAZRYV” AND ITS APPLICATION IN INVESTIGATION OF ACTUAL STRESS FIELDS IN SALT ROCK MASS

Abstract

The paper describes the updated outfit of measuring and computing complex “Gidrorazryv” designed at the Institute of Mining, of SB of RAS in the 1980s. The complex includes an in situ data recording and processing system with the wireless transmission of data and control commands between the recording unit and portable computer, as well as a software to support experiments based on LabView graphic programming package. For the experimental determination of actual stresses components in salt rocks in mines of URALKALI, Gidrorazryv-complex is equipped with two measuring probes of new design. Furthermore, there is a probe with four packers and two cylinders for axial compression of the packers, and a probe fitted with packers reinforced by springs. In 2016 Gidrorazryv-complex was used in 75 hydraulic fracturing stress measurement tests in SKRU Mines 1, 2 and 3 of URALKALI. As an example the paper describes the experimentation conditions and results obtained in SKRU Mine-2. The tests were carried out at two measurement points at the depth of 200 m in the main haulage drift. All in all,
24 hydrobreacking tests were performed in that mine. The experimentation in SKRU Mines 1, 2 and 3 of URALKALI
in 2016 prove the successful applicability of measuring and computing complex “Gidrorazryv” to determine stress state field parameters in deep-level of salt rock mass. The experimentally estimated vertical stresses were close in value to the calculated vertical stress component due to the weight of the overburden rock mass, and the horizontal stresses exceeded the vertical stresses by 2–3 times.