Numerical simulation on the blasting of insoluble interlayer in bedded salt cavern

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (14) : 55-62.

PAN Yue1，LI Erbing1，YOU Yechao2，PU Shikun1，DUAN Jianli1，TAN Yuehu1

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Abstract

The controlled blasting of insoluble interlayer can eliminate hidden dangers in the cavity construction and speed it up.In order to study the blasting effect of insoluble interlayer in bedded salt cavern, the dynamic mechanical properties of mudstone interlayer were tested by the split Hopkinson pressure bar (SHPB) device with confined pressure，and the parameters of a plastic-kinematic model were obtained.The LS-DYNA finite element program was embedded in the simulation verification, and the numerical model for the bedded salt cavern insoluble interlayer blasting was established.The influences of different explosive equivalent at different explosive positions on the collapse range of interlayer blasting and the tightness of salt chamber were revealed by the numerical simulation model.The results show that the dynamic characteristics of mudstone can be well fitted by using the plastic-kinematic model in LS-DYNA.The stress wave acting on the surrounding rock of salt chamber is transmitted through the brine and interbed rock mass.The velocity of stress wave in rock mass is obviously faster than that in water.In the case，of the column radius 7.5 cm， height 6 m， explosive equivalent 76.8 kg， the interlayer can be controlledly collapsed when the explosive is put in the middle of the interlayer，and the closeness of the surrounding rock of the salt cavern is ensured.

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Key words：rock mechanics / layered salt cavern / insoluble interlayer;blasting effect / LS-DYNA

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PAN Yue1，LI Erbing1，YOU Yechao2，PU Shikun1，DUAN Jianli1，TAN Yuehu1. Numerical simulation on the blasting of insoluble interlayer in bedded salt cavern[J]. Journal of Vibration and Shock, 2019, 38(14): 55-62

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