Falling behavior and application of interlayer-collapse-formed blocks during solution mining in salt cavern storages
GE Xinbo1，2，3，LI Yinping3，LI Jinlong4，SHI Xilin3，MA Hongling3
(1. College of Energy and Mining Engineering，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；
2. State Key Laboratory Breeding Base for Mining Disaster Prevention and Control，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；3. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；4. Center for Hypergravity Experiment and Interdisciplinary Research，Zhejiang University，Hangzhou，Zhejiang 310058，China)
Abstract：During cavern leaching in layered salt rock of China，the falling blocks formed by interlayer collapse may collide with the leaching tubing. The falling blocks are deposited on the cavern bottom to form accumulation characteristics. Therefore，laboratory experiments of free-falling homogeneous aluminum blocks in water were carried out using photography，in order to study the free-falling motion behavior of typical interlayer blocks. Based on the repeated block-falling experiment，distribution characteristics of block-falling points were preliminarily analyzed，and the probability of blocks colliding with the leaching tubing was qualitatively evaluated. The results show that：(1) The motion behavior of the free-falling block in still water can be divided into four types：steady falling，zigzag motion，tumbling motion and chaotic motion. (2) The motion behavior of free-falling blocks is greatly affected by its own geometric size ratio(such as length-to-width ratio，thickness-to-width ratio)，and is sensitive to initial conditions(such as initial angle). (3) For blocks with a thickness-to-width ratio of not more than 0.2 and a length-to- length ratio of not less than 2 falling in the cavern，there is a high probability of colliding with the leaching tubing. The research results may be expected to be applied to optimize the simulation software of cavern leaching，so that the shape prediction of salt caverns is more in line with the engineering reality，and the accident of leaching tubing broken by the block is reduced.
葛鑫博1，2，3，李银平3，李金龙4，施锡林3，马洪岭3. 盐穴储库水溶造腔夹层垮塌块体下落性态及应用[J]. 岩石力学与工程学报, 2023, 42(4): 918-929.
GE Xinbo1，2，3，LI Yinping3，LI Jinlong4，SHI Xilin3，MA Hongling3. Falling behavior and application of interlayer-collapse-formed blocks during solution mining in salt cavern storages. , 2023, 42(4): 918-929.
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2023, Vol. 42 
