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将盐穴储气库地表沉降量计算分为造腔和存储两个阶段进行研究,考虑了盐岩蠕变性的影响,采用扩展形式的Gaussian曲线表示沉降区形状,建立了盐穴储气库地表动态沉降量计算模型,并推导出相应的地表动态沉降量计算公式.采用本文模型、Schober&Sroka模型、Fokker模型和FLAC3D对某盐穴储气库地表动态沉降量进行了模拟计算,分析了盐穴储气库的造腔速率、内压、埋深、直径、高度和时间等因素对盐穴储气库地表动态沉降量的影响,并对比了计算结果.计算结果表明:本文模型考虑到盐岩蠕变性特征具有较高的计算精度,可以满足实际工程计算精度要求;盐穴储气库地表动态沉降量随着造腔速率、埋深、直径、高度和时间增加而增加,随着内压增加而降低;内压、埋深、直径和时间对盐穴储气库地表动态沉降量影响比较显著,而造腔速率和高度对其影响不显著.
The calculation of surface subsidence of salt cavern gas storage is divided into two phases: caving and storage. The influence of creep of salt rock is considered. The extended form of Gaussian curve is used to represent the shape of subsidence area. A salt cavern gas storage The calculation formula of the dynamic settlement of the ground surface and the calculation formula of the dynamic settlement of the surface are deduced.The dynamic settlement of the ground surface of a salt cavern gas storage is simulated by this model, Schober & Sroka model, Fokker model and FLAC3D, The effect of gas storage rate, internal pressure, burial depth, diameter, height and time on the dynamic settlement of the surface of salt cavern gas reservoirs are compared and the results are contrasted. The calculation results show that the model takes salt rock The creep characteristics have higher calculation accuracy and can meet the requirements of actual engineering calculation precision. The dynamic settlement of ground surface in salt cavern gas storage increases with the increase of cavity injection rate, depth, diameter, height and time. With the increase of internal pressure While the internal pressure, depth, diameter and time have significant influence on the dynamic settlement of the surface of salt cavern gas storage, but the effect of cavitation rate and height is not significant.