| 平顶山地下盐穴储气库泥岩夹层稳定性评价 |
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| 引用本文： | 王志荣,王永春,高志俭,陈玲霞.平顶山地下盐穴储气库泥岩夹层稳定性评价[J].高校地质学报,2019,25(1):116. |
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| 作者姓名： | 王志荣 王永春 高志俭 陈玲霞 |
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| 作者单位： | 郑州大学水利与环境学院,郑州,450001;河南省地矿建设工程(集团)有限公司,郑州,450000 |
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| 基金项目： | 国家自然科学基金;河南省自然科学基金 |
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| 摘 要： | 泥岩夹层在盐溶建腔阶段难以被溶蚀，盐层溶采后仍赋存于腔内。针对平顶山地下储气库在储气运行阶段，未被溶
蚀的夹层因岩体流变性出现垮塌而影响储气库安全运行的难题，提出一种基于夹层垮塌时间的稳定性评价方法。首先，根
据弹性板壳理论建立夹层力学模型，解得夹层局部破坏的极限应变；其次，根据夹层岩样蠕变实验，建立蠕变本构模型。
最后，结合夹层力学模型与蠕变本构模型，建立垮塌时间计算模型，并利用基于PSO 算法的Matlab 程序对平顶山储气库夹
层不同预设厚度的垮塌时间值计算，对临界垮塌厚度值进行反演计算。结果表明：随夹层厚度增加，其计算垮塌时间增
大，夹层稳定性提高；厚度相同的夹层，其跨径越大，计算垮塌时间值越小，计算临界垮塌厚度值越大，即稳定性越差；
对小于临界垮塌厚度的夹层，其在设计使用年限内垮塌失稳风险较高，反之则垮塌失稳风险较小。
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| 关 键 词： | 泥岩夹层 力学模型 蠕变本构模型 垮塌时间 临界垮塌厚度 稳定性评价 |
Stability Evaluation of Mudstone Interlayer in Pingdingshan Underground Salt Cavern Gas Storage |
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| WANGZhirong,WANGYongchun,GAOZhijian,CHENLingxia.Stability Evaluation of Mudstone Interlayer in Pingdingshan Underground Salt Cavern Gas Storage[J].Geological Journal of China Universities,2019,25(1):116. |
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| Authors: | WANGZhirong WANGYongchun GAOZhijian CHENLingxia |
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| Abstract: | A mudstone interlayer is difficult to be dissolved and is left inside the cavity after the cavity construction. For the operation
period of gas storage, the problem of collapse of non-corroded mudstone interlayers due to strong rock rheology threatens the safe
operation of gas storage. In this study, an interlayer stability evaluation method based on collapse time is proposed. First, an interlayer
mechanic model was established based on the elastic mechanics theory and the threshold strain, when an interlayer partially collapsed,
was solved. Second, according to the creep test results of mudstone interlayers in Pingdingshan region, a creep constitutive model was
built up. Finally, the interlayer mechanic model and the creep constitutive model are combined to derive the model of the interlayer
collapse time. Using Matlab program based on the PSO algorithm, the model can calculate the collapse time value of different preset
thicknesses of the interlayer and compute for the critical collapse thickness. The result shows that the calculated collapse time
increases with the increase in interlayer thickness and the interlayer stability is higher. For the mudstone interlayer of the same
thickness, the greater its span, the shorter collapse time, the greater the calculated critical thickness, the worse the stability.
Meanwhile, for an interlayer with less than critical collapse thickness, the risk of an interlayer collapse is higher within its service life;
and vice versa. |
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| Keywords: | mudstoneinterlayer mechanicmodel creepconstitutivemodel collapsetime criticalcollapsethickness stabilityevaluation |
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