Abstract
To study the mechanical behavior of apparent fissures in salt rock, tests on the rock mechanics were conducted on an RMT-150B multifunctional system. The effects of the apparent fissures on the strength and deformation, as well as the apparent fissure propagation behavior of the salt rock and its coalescence pattern, were analyzed. The propagation evolution of the apparent fissures was divided into two types. The main fissures extending from the initial apparent fissures of the salt rock specimens comprised the first type. The second type was that the initial apparent fissures of specimens were closed. Then, new microfissures initiated from the initial apparent fissures gathered together, and formed main fissures. Simultaneously, the secondary fissures grew slowly. The tensile coalescence pattern and tension-shear coalescence pattern are the main coalescence patterns of salt rock with apparent fissures. Pressured coalescence patterns and other coalescence patterns did not appear. Owing to the compactness of the structure, the paths of fissure coalescence present an obvious zigzag line. The influence of vertical transfixion fissures on the deformation modulus of salt rock is greater than the influence of inclined fissures.
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