爆破作用下层状盐穴难溶夹层垮塌效应解析分析

doi:10.13722/j.cnki.jrme.2018.0091

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摘要层状盐穴储库难溶夹层在自然条件下的垮塌具有不可控性，给水溶建腔和储库运营带来了诸多安全隐患，通过控制爆破可以促使难溶夹层可控垮塌，加快建腔速度。为分析难溶夹层的垮塌效应，在弹性力学理论基础上，分别建立夹层中间和板面装药2种情况的力学简化计算模型，推导难溶夹层板在爆破作用下的应力分量表达式。同时对爆破作用下夹层垮塌效应进行分析，根据材料的强度破坏准则，得到2种装药情况下夹层破坏的范围。针对某工程实例，应用推导的公式对爆破作用下夹层垮塌进行理论计算分析，结果表明：夹层中间装药时，不耦合系数从1.0变化到2.0，粉碎区半径为2～4倍钻孔半径，破裂区半径为6～9倍钻孔半径；夹层板面装药时，夹层下部的破坏范围比上部大，且夹层上边缘会发生受拉破坏。

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	蔡舒凌1
	李二兵1
	谭跃虎1
	尤业超2
	段建立1
	濮仕坤1

关键词 ：岩石力学, 难溶夹层, 模型简化, 力学计算, 垮塌分析, 强度准则, 爆破作用, 破坏范围

Abstract：In the bedded salt cavern reservoir，the insoluble interbed collapsed under natural conditions is uncontrollable and brings potential danger to the cavern making with water solution and to the operation of storage. Controlled blasting can promote the steerable collapse of the insoluble interbed and speed up the construction of cavity. In order to analyze the effect of the insoluble interbed collapse，a simplified mechanical model for two cases with placing explosives in the interbed and on the interbed plate respectively were established on the basis of the theory of elasticity. The expressions of stress component in the insoluble interbed under blasting loading were derived. Besides，the effect of the interbed collapse under blasting loading was analyzed. In the light of the strength failure criterion of the material，the radii of the broken zones under two kinds of explosive locations were obtained. Theoretical analysis to the interbed collapse in a salt cavern under blasting loading was carried out with the derived formula. The results show that when the explosive is placed in the interbed，the range of decoupling coefficient is between 1.0 to 2.0，the radius of crush zone is 2–4 times of the borehole radius，the radius of rupture zone is 6–9 times of the borehole radius. When the explosive is placed on the interbed plate，the lower part of damage range is larger than the upper part，and tensile failure will occur on the upper edge of the interbed.

Key words： rock mechanics insoluble interbed model simplification collapse analysis strength criterion blasting loading damage zone

引用本文:

蔡舒凌1，李二兵1，谭跃虎1，尤业超2，段建立1，濮仕坤1. 爆破作用下层状盐穴难溶夹层垮塌效应解析分析[J]. 岩石力学与工程学报, 2018, 37(8): 1873-1883.
CAI Shuling1，LI Erbing1，TAN Yuehu1，YOU Yechao2，DUAN Jianli1，PU Shikun1. Analytical analysis on collapse effect of insoluble interbed in bedded salt cavern under blasting loading. , 2018, 37(8): 1873-1883.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0091 或 http://www.rockmech.org/CN/Y2018/V37/I8/1873

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