压气储能作用下断层活化力学稳定性分析

Mechanical stability analysis of fault activation under the action of compressed gas energy storage

摘要

针对储气库围岩中隐伏断层力学稳定性规律尚不明确，采用数值模拟手段，以含断层围岩的废弃煤矿地下储气库为研究对象，建立压气储能热-流-固耦合模型，分析得到了断层对储气库稳定性的影响及储气库注气速率、循环周期、断层倾角和埋深等敏感性参数对断层稳定性的影响。研究结果表明：断层增加了洞室的侧面最大径向位移，但减小了顶部最大径向位移，有抗地表隆起破坏的作用；断层敏感性参数中，埋深的影响程度最大，断层倾角其次，注气速率最小；随着注气速率和循环周期的增加，断层的滑动趋势线性增加，断层的安全系数FOS线性减小；随着埋深的增加，断层的滑动趋势呈指数上升，断层的安全系数FOS（factor of safety）呈指数下降；断层倾角70°时，断层的稳定性最大，达到了抛物线的极值点。所得结论为储气库的使用寿命和安全性提供了科学参考。

Abstract

In view of the fact that the mechanical stability law of buried faults in the surrounding rock of gas storage is not clear，the numerical simulation method is used to establish the thermal-fluid-solid coupling model of compressed gas energy storage by taking the abandoned coal mine underground gas storage with fault surrounding rock as the research object. The influence of faults on the stability of gas storage and the influence of sensitive parameters such as gas injection rate，cycle period，fault dip angle and buried depth of gas storage on the stability of faults are analyzed. The results show that the fault increases the maximum radial displacement of the side of the cavern，but decreases the maximum radial displacement of the top，which has the effect of resisting the surface uplift damage. Among the fault sensitivity parameters，the buried depth has the greatest influence，the fault dip angle is second，and the gas injection rate is the smallest. With the increase of gas injection rate and cycle period，the sliding trend of the fault increases linearly，and the safety factor FOS of the fault decreases linearly. With the increase of buried depth，the sliding trend of the fault increases exponentially，and the safety factor FOS of the fault decreases exponentially. When the fault dip angle is 70°，the stability of the fault is the largest，reaching the extreme point of the parabola. The conclusions obtained provide a scientific reference for the service life and safety of gas storage.

关键词

地下压缩空气储能 / 废弃煤矿 / 内衬洞室 / 断层 / 稳定性 / 数值模拟

Key words

underground compressed air energy storage / abandoned coal mine / lined cavern / fault / stability / numerical simulation

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基金资助

内蒙古自治区科技重大专项资助项目(2021ZD0034-2)