温降对液化石油气储库围岩裂隙开裂影响的数值分析  

NUMERICAL ANALYSIS OF EFFECT OF TEMPERATURE DECREASING ON CRACK OF CHILLED LPG UNLINED STORAGE CAVERN

作　　者：徐彬[1] 闫娜[2] 李宁[3] 李仲奎[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]北京市勘察设计研究院有限公司,北京100038 [3]西安理工大学岩土工程研究所,陕西西安710048

出　　处：《岩石力学与工程学报》2011年第4期718-726,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展规划(973)项目(2009CB724604);中国博士后科学基金项目(20100480324)

摘　　要：从单条裂隙入手,将出露于低温LPG不衬地下储库洞壁的主裂隙简化为带边缘裂纹半无限板分析模型,将洞壁附近未出露的主裂隙简化为靠近自由边缘内置裂纹的半无限板分析模型。首先分析在温度降低过程中岩石物理力学参数随温度变化对裂隙扩展的影响;其次分析温度边界类型、降温程度、降温速度、裂隙与洞壁夹角对不同长度裂隙的温度场、应力场和裂尖应力强度因子的影响,以探求降温导致裂隙扩展的机制;最后作为一种尝试研究,利用叠加原理考虑在裂隙温度降低时地应力对裂纹扩展的抑制作用,分析以原有裂隙不扩展为条件时存储介质温度与地应力的关系。Through a single crack,the main cracks appeared in the wall and imbedded near the wall of cavern are simplified as a half infinite plane with a fringe crack and one with a crack near the free edge for chilled liquefied petroleum gas（LPG） storage cavern respectively.To explore the influence mechanism of temperature decreasing on crack propagation,firstly the effect of rock parameters change caused temperature decreasing on the crack propagation is analyzed.Secondly,the effects of temperature boundary type,intensity and velocity of temperature decreasing,and angle between crack and wall on the temperature fields,stress fields and the stress intensity factors（SIF） of cracks with different lengths are researched.Finally,as a tentative research,the inhibition action of the ground stress on crack propagation during the temperature decreasing of crack is taken into consideration through the principle of superposition;and the relationship between the of temperature storage medium and the ground stress of cavern is analyzed under the condition of the existent crack non-propagating.

关 键 词：岩石力学 低温LPG不衬地下储库 裂隙 温度降低 应力强度因子 

分 类 号：TU45[建筑科学—岩土工程]