盐岩屈服–破坏特征的试验及理论研究

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Abstract The scopes of yield zone and failure zone of surrounding rock are the important factor in design of the space between underground gas storages in rock salt formation. Accurate description of yield and failure property is helpful for reducing the space between storages and building more storages in a limited rock salt zone. Based on the uniaxial compression tests and axial compression tests，yield property and failure characteristics were analyzed and surrounding rock is divided into elastic zone，plastic zone and failure zone. Experiment results show that yield function is a linear curve and Tresca yield criterion can be used to describe the yield characteristics of rock salt. The second invariant of plastic strain was used as harden parameter to analyze the harden property of rock salt，and the result shows that rock salt is a isotropic hardening material. In terms of yield，rock salt acts like metal，in terms of failure，it?s like rock. Shear failure and split failure were observed in compression tests. Split failure observed in axial compression test was analyzed based on the theory of thick cylinder. Failure property was confining pressure dependent，and when confining pressure is equal or greater than 5 MPa，the rock salt would never break even the axial strain move to 20%. A non-broken criterion was imported into Mohr-Coulomb criterion and a new failure criterion was built which contain tensile failure criterion，shear failure criterion and non-broken criterion. Based on the failure criterion，the stress space was divided into three parts：tensile failure zone，shear failure zone and non-broken zone. The constitutive model was modified and state parameters were self-defined in FLAC3D. A simple model was constructed to verify new yield function and modified failure criterion. Elastic zone，plastic zone and failure zone were found in the surrounding rock，which is the same as the surrounding rock zones divided above.

Key words： rock mechanics rock salt yield failure Mohr-Coulomb criterion

Received: 02 May 2012

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http://www.rockmech.org/EN/Y2012/V31/Is2/3747

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