夹层力学特性对盐岩储库稳定性影响的模拟分析  

Simulation and Analysis on the Effect of Interlayer's Mechanical Properties to Stability of Salt-rock Storage Cavern

作　　者：喻超[1] 黄小兰[1,2] 马洪岭[2] 

机构地区：[1]武汉工业学院土木与建筑工程学院,湖北武汉430023 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室,湖北武汉430071

出　　处：《矿业研究与开发》2012年第5期85-90,共6页Mining Research and Development

基　　金：国家自然科学基金青年项目(51104108);国家重点基础研究发展规划(973)项目(2009CB724600);博士后科学基金(20090450786);岩土力学与工程国家重点实验室开放基金(Z010902)

摘　　要：针对在层状盐岩构造中修建储库时,夹层对储库长期稳定性具有重要影响这一关键问题,建立储库三维单腔模型,通过数值试验,讨论了含不同厚度软、硬夹层的盐岩储库在不同运行内压长期作用下的稳定性,详尽分析了各种工况下的腔体收缩率,围岩塑性区及腔体最大位移分布。结果表明:随腔体含软夹层厚度增大,腔体收缩率呈略微上涨,而随硬夹层厚度增大,则出现较明显的下降。软夹层厚度的变化对围岩塑性区影响并不明显,硬夹层厚度的变化则会带来比较明显的影响,且含软、硬夹层腔体塑性区分布在夹层处存在显著差异,另外软夹层对塑性区的影响要比硬夹层小得多,且塑性区对随内压增加而减小的现象反应更为敏感,硬夹层在低压下比软夹层更容易破裂。含软夹层腔体最大位移量发生在夹层处,含硬夹层腔体最大位移量发生在盐岩处。最后综合分析发现,小厚度的硬夹层,大厚度的软夹层,对腔体的稳定性更为不利。Interlayer have important impact on the long-term stability of salt-rock storage cavern which is constructed in layered salt formation with soft interlayer and hard interlayer.Three dimensional model of single salt-rock storage cavern was built,by numerical experiment,considering different thickness of soft interlayer and hard interlayer,the stability of salt-rock storage cavern under the long-term effect of operation internal-pressures was discussed,the shrinkage rate,plastic zone and maximum displacement of storage cavern under various operating conditions were analyzed in detail.The results indicated that： the shrinkage rate of cavern increased appreciably with the increase of thickness of soft interlayer,but decreased significantly with the increase of thickness of hard interlayer;the change of plastic zone was not obvious with the increase of thickness of soft interlayer,but was obvious with the increase of thickness of hard interlayer,and when storage cavern was in salt-rock with soft interlayer and hard interlayer,the distribution of plastic zone at soft interlayer was very different with that at hard interlayer,the effect of soft interlayer on plastic zone was less than that of hard interlayer,the decrease of plastic zone was more sensitive to the increase of internal-pressure than hard interlayer,hard interlayer was more easier to fracture than soft interlayer under lower pressure;the maximum displacements of cavern with soft interlayer happened at the interlayer,the maximum displacements of cavern with hard interlayer happened at the salt-rock.After comprehensive analysis,it was found that hard interlayer with a small thickness and soft interlayer with a great thickness were more unfavorable to the stability of salt-rock storage cavern.

关 键 词：层状盐岩 蠕变 储库 稳定性 数值模拟 

分 类 号：TE822[石油与天然气工程—油气储运工程]