层状盐岩储气库运营压力失控全过程稳定性分析

doi:10.13722/j.cnki.jrme.2014.0775

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摘要为研究极端荷载作用下深部层状盐岩储气库(群)的非线性响应特征，针对金坛盐岩地质构造，建立层状盐岩储气库水溶建腔、注采运营至失控井喷卸压全过程数值分析模型，运用自定义盐岩黏弹塑性损伤模型计算失控卸压对储库单、双腔渐进破坏、变形收敛及地表沉降的影响。结果表明，夹层位置围岩破损深度要显著大于其他部位，且极端卸压造成的腔周破损区达到10 a循环注采运营阶段的5～10倍；失控卸压阶段溶腔平均体积收敛速率达0.012 %/d～0.013 %/d，为正常注采运营阶段的6.0～6.5倍；地表沉降呈漏斗状曲线分布，极端卸压影响范围在两倍溶腔直径范围之内。双腔分析揭示出两倍溶腔直径安全矿柱宽度下相邻腔体间的相互作用已不明显。

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	马林建1
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	许宏发1
	王明洋1
	李二兵3

关键词 ：岩石力学, 层状盐岩, 储气库, 蠕变损伤, 失控卸压, 稳定性

Abstract：To investigate the nonlinear response of deep bedded salt cavern(group) subjected to extreme loads，the numerical model considering the complete process of water solution，cyclic operation，and internal pressure runaway was established according to the geological structure of Jintan deposit. The effects of rapid unloading on the progressive failure，the volume convergence of single and double cavern，as well as the surface subsidence were calculated utilizing a new elasto-viscoplastic damage model for rock salt. The results reveal that the damage and failure region extends much deeper in the mudstone than that in the host salt. The damage and failure volume of surrounding salt induced by unloading process is 5–10 times larger than that of 10-year cyclic injection- ejection. The average volume convergence rate of salt cavern reaches 0.012%/d–0.013%/d. It is 6.0–6.5 times faster than that caused by cyclic operation. The surface subsidence presents a typical funnel curve. The influenced range of surface subsidence due to rapid unloading is about two times the maximum cavern diameters. The double cavern analysis indicates that the interaction between adjacent caverns is not obvious given the pillar width is larger than two times the maximum cavern diameters.

Key words： rock mechanics bedded rock salt gas storage creep damage uncontrolled unloading stability

引用本文:

马林建1，2，许宏发1，王明洋1，李二兵3. 层状盐岩储气库运营压力失控全过程稳定性分析[J]. 岩石力学与工程学报, 2015, 34(S2): 4108-4115.
MA Linjian1，2，XU Hongfa1，WANG Mingyang1，LI Erbing3. NUMERICAL STUDY OF GAS STORAGE STABILITY IN BEDDED ROCK SALT DURING THE COMPLETE PROCESS OF OPERATING PRESSURE RUNAWAY. , 2015, 34(S2): 4108-4115.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.0775 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/4108

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