The constitutive model was modified and the state parameters were self-defined in FLAC3D. A new stability criterion based on the partitions is proposed. Based on the yield–dilatancy–failure model, the rock surrounding an underground gas storage (UGS) is divided into four zones: elastic, plastic, permeability and failure zone. A no-broken condition was imported into the Mohr–Coulomb criterion. When the confining pressure is equal or greater than 5 MPa, the rock salt never breaks, even when the axial strain reaches 20 %. The results indicate that failure depends on confining pressure. Splitting failure was analyzed based on the elastic theory for thick cylinders. Shear and splitting failures were observed in the compression tests. It is found that the dilatancy boundary for the Jianghan rock salt is different from the results in the previous studies, especially under high stresses.
The dilatancy boundary was estimated in each experiment by determining the volume turnover point from compression to dilatation. From the perspective of yielding, the rock salt acts like metals, while from the perspective of failure it acts like rocks. The result shows that the rock salt is an isotropic hardening material. The second invariant of the plastic strain was used as the hardening parameter to analyze the hardening behavior of the rock salt. The experimental results showed that the yield function is a straight line and thus the Tresca yield criterion can be used to describe the yield behavior of the tested rock salt. Accurate description of the yield and failure behaviors is helpful to reduce the space between storage caverns and offer more storage in a salt mine of limited extent. Ma, Hongling Yang, Chunhe Li, Yinping Shi, Xilin Liu, Jianfeng Wang, Tongtaoīased on uniaxial and triaxial compression experiments, the yield, dilatancy and failure behaviors of the Jianghan rock salts were investigated. Stability evaluation of the underground gas storage in rock salts based on new partitions of the surrounding rock Stability evaluation of the underground gas storage in rock salts based on new partitions of the.
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