盐岩地下储气库群间距数值计算分析

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摘要为确保储气库群的安全性及使用功能，各储存库之间应该保证有足够的距离。盐岩储库群地质条件及运行工况复杂，材料参数变异性强，随机特性对结构安全性影响较大。从稳定性和密闭性两方面出发，以莫尔–库仑准则和损伤扩容准则作为主要失效准则，建立两腔储库群数值计算模型，计算不同储库间距和运行内压下塑性区及损伤扩容区分布。采用响应面法，结合蒙特卡罗方法计算储库群腔周矿柱单元失效概率。结果表明，正常运行状态下，随储库间距减小，损伤扩容区范围明显增大，塑性区范围及腔周矿柱单元失效概率计算结果均明显增大，尤其在低压时更可能产生损伤连通区。对于运行过程中存在的注、采气不同步情况，随着储库间距的增大，压力差对腔周矿柱单元失效概率的影响逐渐减弱。根据稳定性和密闭性分析结果，建议储气库最小间距为2D。

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关键词 ：岩石力学, 盐岩, 储库间距, 莫尔&ndash, 库仑准则, 损伤扩容准则, 失效概率, 响应面法

Abstract：Reasonable distance between caverns is indispensable for the safety and normal operation of underground storage caverns. Many factors such as complex geological and operation conditions，high variability and stochastic behavior of material parameters influence the safety of caverns. In this paper，taking account of stability and sealability，Mohr-Coulomb criterion and damage-dilatancy criterion are used as main failure criterion. Then distributions of plastic area and damage-dilatancy area under different conditions under different distances between gas storage caverns and operating pressures are calculated by a two-gas storage cavern numerical calculation model. Failure probabilities of elements nearby the caverns are also calculated by response surface method combining with Monte-Carlo method. The calculation results indicate that：at normal operation conditions，plastic area and failure probabilities of elements nearby the caverns increase obviously with the decreasing distance between storage caverns. At the same time，damage-dilatancy area increases remarkably with the decreasing distance between storage caverns；the damage-dilatancy area even connects the two caverns when operation pressure is low. When operation pressures of two caverns are different，the influence of differential pressure on failure probabilities of elements nearby the caverns diminishes gradually with the increasing distance between storage caverns. According to the calculation results of stability and sealability，taking two times of cavern diameter as the minimum distance between gas storage caverns is reasonable.

Key words： rock mechanics salt rock distance among storage caverns Mohr-Coulomb criterion damage- dilatancy criterion failure probability response surface method

收稿日期: 2010-07-30

引用本文:

刘健1，宋娟1，张强勇1，张文倩1，贾超1，李术才1，杨春和2. 盐岩地下储气库群间距数值计算分析[J]. 岩石力学与工程学报, 2011, 30(S2): 3413-3420.
LIU Jian1，SONG Juan1，ZHANG Qiangyong1，ZHANG Wenqian1，JIA Chao1，. NUMERICAL CALCULATION AND ANALYSIS OF DISTANCE AMONG SALT ROCK UNDERGROUND GAS STORAGE CAVERNS. , 2011, 30(S2): 3413-3420.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS2/3413

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