Time-dependent subsidence prediction model and influence factor analysis for underground gas storages in bedded salt formations
 作者： Guimin Zhang,  Yu Wu,  Lijuan Wang,  Kai Zhang,  Jaak J.K. Daemen,  Wei Liu 作者单位： 1State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China2School of Geodesy and Geomatus, Jiangsu Normal University, Jiangsu 221116, China3Mackay School of Earth Sciences and Engineering, University of Nevada, Reno, NV, USA4State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China 刊名： Engineering Geology, 2015, Vol.187 , pp.156-169 来源数据库： Elsevier Journal DOI： 10.1016/j.enggeo.2015.01.003 关键词： Underground gas storages in bedded salt formations;  Impurity and creep;  Time-dependent surface subsidence;  Solution and operation;  Influence factors;  Numerical modeling; 原始语种摘要： Abstract(#br)Taking into account the impurity and creep of rock salt, a new model is proposed to predict the time-dependent subsidence of the surface above underground gas storage caverns in bedded salt formations. In this model, the shape of the storage cavern is assumed to be a sphere. Formulae are developed for the volume and volume reduction of the cavern over time during both the construction and the operating periods. A probability integral method is adopted to determine the shape of the subsidence regions, and corresponding formulae are derived for the time-dependent surface subsidence, radial tilt and radial curvature. FLAC3D was used to verify the proposed prediction model. Using the proposed model, parametric analyses are carried out to study the influences of draw angle, volume... adjusting coefficient, brine withdrawal rate, internal pressure, cavern depth, material properties of the rock salt, cavern diameter, and operating time on the surface subsidence. The results show that: the subsidence increases with an increase of the draw angle, volume adjusting coefficient, brine withdrawal rate, cavern diameter, material properties of the rock salt, and time, but decreases with an increase of internal pressure. Subsidence increases first and then decreases with increasing cavern depth. Draw angle, volume adjusting coefficient, cavern depth, cavern diameter, material properties of the rock salt, time and internal pressure have a large influence on the subsidence, but there is little influence from the brine withdrawal rate and salt impurity.

• underground　地下的
• cavern　岩洞
• subsidence　下沉
• bedded　层状的
• influence　影响
• dependent　从属的
• formations　社区
• model　模型
• creep　蠕变
• coefficient　系数