Experimental and Theoretical Estimation of Fracture Toughness in Salt Rocks in Testing of Samples with Wedge-Shaped Cut
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Experimental and Theoretical Estimation of Fracture Toughness in Salt Rocks in Testing of Samples with Wedge-Shaped Cut V. N. Aptukova* and S. V. Volegova a
Perm State National Research University, Perm, 614000 Russia *e-mail: [email protected] Received February 10, 2020 Revised February 18, 2020 Accepted April 10, 2020
Abstract—The article presents the procedure for the experimental and theoretical estimation of fracture toughness in salt rocks in testing of samples with wedge-shaped cut and by numerical modeling of the tests in ANSYS. The values of the stress intensity factor and the energy release intensity factor in tensile fracturing are presented for salt rocks of the Upper Kama Potash Salt Deposit. Keywords: Salt rocks, sample with wedge-shaped cut, fracture toughness, mathematical modeling. DOI: 10.1134/S1062739120026613
INTRODUCTION
The practice of salt mines construction and operation proves brittle behavior of rock mass in the unfavorable conditions, with isolated or multiple fracturing in waterproof strata, in roof rocks in stopes and in pillars in case of massive dynamic failure [1]. The literature review shows the absence of calculations with regard to possible fracturing of salty rocks, deficiency of experimental determination of fracture toughness in salt rocks, and shortage of standard estimation procedures. In structurally heterogeneous bodies, in particular mineral aggregates, softening is governed by defects (cracks, pores, etc.) on different scales: inside crystals (
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