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| EXPERIMENTAL STUDY OF MECHANICAL CHARACTERISTICS OF MOLDED SALT ROCK WITH WEAK INTERLAYER |
| JIANG Deyi1，REN Tao1，CHEN Jie1，REN Song1，FAN Xueqin1，YANG Chunhe1，2 |
(1. State Key Laboratory of 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 In order to study the influence of different interlayer characteristics on mechanical properties of molded salt rock with weak interlayer，regularly molded layered salt rock was made by pressing the molded salt rock，and uniaxial and triaxial compression tests were carried out，considering that samples are not easy to be obtained by coring in field. The results show that the mechanical parameters，such as strength，elastic modulus，and Poisson?s ratio and the formation and failure characteristics of molded salt rock with weak interlayer change regularly to a certain extent as the interlayer?s thickness ratio and distribution characteristics change regularly. The following experimental results can be drawn. (1) The uniaxial compressive strength and elastic modulus of molded salt rock with weak interlayer decline with the increase in interlayer?s thickness ratio. (2) When the interlayer?s thickness remains unchanged，the strength of molded salt rock with three interlayers is higher than that of molded salt rock with one or two interlayers. As the distance between interlayers increases，the strength and elastic modulus of molded salt rock with weak interlayer decrease gradually. (3) The pure salt rock with high strength has stronger radial strain than the interlayer with low strength，and the failure surface is always generated from the pure salt rock. Generally speaking，these results can provide a new method for analysis of mechanical properties of layered salt rock and stability of underground salt rock storage.
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Received: 27 April 2012
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2012, Vol. 31 
