吉林大学学报(地球科学版)

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盐岩地下储气库体积收敛失效概率分析与模型试验验证

王保群1,2,张强勇2,李术才2,张宁2   

  1. 1.山东交通学院土木工程学院, 济南250023;
    2.山东大学岩土与结构工程研究中心, 济南250061
  • 收稿日期:2013-09-16 出版日期:2014-05-26 发布日期:2014-05-26
  • 作者简介:王保群(1968-),男,教授,博士,主要从事岩土工程、桥梁工程方面的教学与研究工作,E-mail:wbaoqun@163.com
  • 基金资助:

    国家“973”计划项目(2009CB724607);国家自然科学基金项目(41172268);山东省自然科学基金项目(Y2007F52)

Analysis of Failure Probability and Verification of Model Test on Underground Gas Storage’s Volume Convergence in Salt Rock

Wang Baoqun1,2,Zhang Qiangyong2,Li Shucai2,Zhang Ning2   

  1. 1.Department of Civil Engineering,Shandong Jiaotong University,Jinan250023,China;
    2.Geotechnical and Structural Engineering Research Center,Shandong University,Jinan250061,China
  • Received:2013-09-16 Online:2014-05-26 Published:2014-05-26

摘要:

盐岩地下储气库受盐岩蠕变特性影响会产生较大的体积收缩变形,影响储气库安全稳定运行。目前对地下储气库体积稳定性分析方法和评价准则各国没有统一标准,国内主要采用数值计算的方法来评价储气库体积稳定性。以江苏金坛盐矿地下储气库体积收敛数值分析为基础,借鉴国外盐岩地下储气库稳定性评价标准,建立盐岩地下储气库体积收敛失效风险评价矩阵,采用一次二阶矩法显示功能函数分析储气库体积收敛失效概率,分析得出:储气库在长期恒定内压工况下体积收敛失效概率随内压的增大而减小;在短期调峰低压工况下体积收敛失效概率随内压的减小而增大;最小内压应保持在4.2 MPa以上。通过交变气压条件下层状盐岩地下储气库大型三维地质力学模型试验得出:储气库体积收敛变形随内压的增大而减小;短期运行最小内压应大于4.0 MPa。模型试验结果与失效概率分析结论较为相似。因此,为避免盐岩地下储气库产生体积收敛破坏,应保证调峰短期最小内压在4.0 MPa以上。

关键词: 盐岩地下储气库, 体积收敛失效, 概率分析, 模型试验, 江苏金坛

Abstract:

Because of the creep characteristics of salt rock, underground gas storage in salt rock will produce larger shrinkage deformation and affect its safe and stable operation. There is no unified national standard for analysis methods and evaluation criteria for gas storage cavity stability currently. The numerical simulation is mainly adopted to evaluate gas storage cavity stability in China. Based on numerical simulation on shrinkage deformation of underground gas storage in Jintan salt mine and using foreign evaluation criteria for underground gas storage stability in salt for reference, volume convergence failure risk evaluation matrix of underground gas storage in salt rock has been established. And the analysis and displaying performance function of volume convergence failure probability of gas storage has been established with first-order second-moment method. The results indicated that failure probability of volume convergence decreases with increasing of internal pressure under long-term constant internal pressure, while it increases with decrease of internal pressure under peak shaving short-term lower internal pressure and the minimum internal pressure should be kept at more than 4.2 MPa. By large scale three-dimensional geomechanical model test on underground gas storage in bedded salt rock under condition of alternating gas pressure, volume convergence deformation of gas storage decreases with increasing of internal pressure and the minimum internal pressure during short-term operation should be greater than 4.0 MPa. The results of model test and failure probability analysis are more similar. So, the minimum internal pressure in peak shaving shortterm should be over 4.0 MPa in order to avoid volume convergence failure for underground gas storage in salt rock.

Key words: underground gas storage in salt rock, failure of volume convergence, analysis of probability, model test, Jintan of Jiangsu

中图分类号: 

  • TU45
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