In recent years, there has been an increased use of rock salt caverns as a medium for various storage purposes. These salt caverns are deep and may range from 300 to 2000 m from the surface where the temperature of the host rock may vary by the kind of its uses. The study presents and discusses the uniaxial compression tests carried out on the rock salt at various temperatures between RT to 250 ℃ on a newly temperature-controlled testing device. A brief description of the experimental setup and test results is presented and the influence of temperature on mechanical characteristics such as stress–strain curve, failure strain, failure stress, stiffness, and modes of failure are discussed in detail. The correlation of the effect of the elevated temperature on the intrinsic creep behaviour of rock salt is also presented. The results show there is a distinct variation in the effect of temperature on the mechanical characteristics of rock salt such as UCS, modulus, failure strain and mode of failure at temperatures exceeding 100° and has a considerable effect on the displacement field around the cavern opening due to an increased creep rate.

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Effect of Temperature on Mechanical Characteristics of Rock Salt

  • Chandan Kumar,
  • Atul Nanda

摘要

In recent years, there has been an increased use of rock salt caverns as a medium for various storage purposes. These salt caverns are deep and may range from 300 to 2000 m from the surface where the temperature of the host rock may vary by the kind of its uses. The study presents and discusses the uniaxial compression tests carried out on the rock salt at various temperatures between RT to 250 ℃ on a newly temperature-controlled testing device. A brief description of the experimental setup and test results is presented and the influence of temperature on mechanical characteristics such as stress–strain curve, failure strain, failure stress, stiffness, and modes of failure are discussed in detail. The correlation of the effect of the elevated temperature on the intrinsic creep behaviour of rock salt is also presented. The results show there is a distinct variation in the effect of temperature on the mechanical characteristics of rock salt such as UCS, modulus, failure strain and mode of failure at temperatures exceeding 100° and has a considerable effect on the displacement field around the cavern opening due to an increased creep rate.