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| RESEARCH ON SOFTENING LAW OF INSOLUBLE INTERLAYER DURING SALT CAVERN BUILDING |
| JIANG Deyi1，ZHANG Junwei1，CHEN Jie1，REN Song1，YANG Chunhe1，2 |
(1. State Key Laboratory for Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400044，China；
2. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，
Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract The uniaxial compression and Brazilian splitting tests on the argillaceous anhydrite from the interlayers of the mine at Yunying were conducted with the different time lengths of immersion in order to reveal the mechanical characteristics (such as the softening) of the insoluble interlayer upon brine immersion and to provide the theoretical guide for the prediction and control of the interlayer destruction during the process of the cavity building inside the rock salt. It was found that the mechanical strengths of interlayer deteriorated significantly with the increasing of the time length of brine immersion. The relationships of the uniaxial compressive strength，the elastic modulus and Poisson?s ratio with the time lengths of brine immersion were fit well with DoseResp function. While the relationship between the tensile strength and the time length of brine immersion was fit with Slogistic1 function. The failure modes of the specimens in the uniaxial compression and Brazilian split tests were gradually changed from the tension failure to the shear failure as the time length of immersion was increased. It was found from the results of the test that the softening effect of brine was closely related with the soluble content of interlayer，the heterogeneity of hydraulic swelling of the interlayer ingredients，the lubrication of brine and the softening effect on the crystal bonding of minerals. An equation of the damage evolution with the time of immersion for interlayers was derived according to the experimental data and a model for softened depth of interlayer in the axial and radial directions was established. The model was applied to determine the softened range of the insoluble interlayer during the process of cavity building in rock salt. In addition，a criterion of maximum tensile stress was presented for the determination and prediction of the local softening damage of interlayers based on the relationship between the tensile strengths and the time lengths of brine immersion.
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Received: 02 July 2013
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2014, Vol. 33 
