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Abstract For investigation on the mechanical characteristics of layered salt rocks in Huai¢an Salt Mine，Jiangsu Province，and in consideration of the laminative geological structural character of most salt mines in China，experimental studies of uniaxial and triaxial compressions are carried out on three kinds of rock samples which are rock salt，mudstone and salt-mudstone interlayer. The experiment results indicate that：(1) The strain-stress relationship of rock salt and salt-mudstone interlayer under uniaxial compression or triaxial compression performs obviously strain hardening-softening properties. (2) The rock salt and salt-mudstone interlayer have obvious plastic deformation ability. The elastic modulus measured by the cycle loading-unloading curve is better than that measured directly from the primeval loading curve. (3) For the rock salt，the cohesive force is getting smaller and smaller while the internal friction angle first increases and then decreases with the plastic shear deformation increasing. (4) The presence of mudstone interlayer affects the mechanical characteristics of samples remarkably. The primary phenomenon is the strength¢s increasing. The failure modes of the mudstone interlayer rock salt are determined by their states.
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Received: 20 March 2009
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