注取油循环荷载作用下地下水封油库运营性能评价  

ASSESSMENT OF PERFORMANCE OF AN UNDERGROUND CRUDE OIL STORAGE CAVERNS SUBJECTED TO CYCLIC LOADING DUE TO STORAGE AND EXTRACTION OF CRUDE OIL IN OPERATION PHASE

作　　者：王者超[1] 李术才[1] 薛翊国[1] 张庆松[1] 赵建纲[1] 姜彦彦[1] 

机构地区：[1]山东大学岩土与结构工程中心,山东济南250061

出　　处：《工程力学》2013年第12期167-175,212,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(41202205;51309145);教育部博士点基金项目(20120131120038);山东省博士后创新项目(201103034)

摘　　要：以我国首个大型地下水封油库工程为背景,采用理论分析和数值模拟等方法评价了注取油循环荷载作用下该油库运营期的稳定性与水封性。针对岩石疲劳力学特性,在常规运动硬化疲劳力学模型基础上,提出可考虑平均主应力影响的岩石疲劳力学模型;编写用户子程序,将所提模型嵌入有限元分析软件,实现了循环荷载作用下地下水封油库运营性能评价。评价过程中选取了同步注取和异步注取两种工况,从围岩稳定性和水封性两方面对洞库运营性能进行了分析评价。分析结果显示:同步注取石油对库区围岩拱顶沉降影响较大,异步注取石油对库区围岩水平收敛影响较大;异步注取条件下水位下降和涌水量均比同步注取条件大,但差异不大。两种工况下洞库运营期间总体稳定性和水封性均能保持良好。The stability and containment properties of an underground crude oil storage cavern, the first underground oil storage cavern in hard rock in China, were investigated using theoretical analysis and numerical simulation. Based on the conventional kinematic hardening fatigue model, a constitutive model was proposed to describe the fatigue behavior of rocks. In the model, the influence of mean stress on the fatigue behavior of rocks was taken into consideration. The model was embedded into a finite element code as a user subroutine to assess the performance of the cavern in operation and subjected to a cyclic loading due to storage and extraction of crude oil. Two representative cases were simulated to investigate the performance of the caverns in operation. One is synchronous storage and extraction for neighboring caverns, while the other is asynchronous storage and extraction. It was found that the crown settlements of caverns for synchronous storage and extraction are higher than those for asynchronous storage and extraction, while the horizontal convergences for asynchronous storage and extraction are higher than that for synchronous storage and extraction. For asynchronous storage andextraction, the groundwater table drawdown and inflow are higher than those for synchronous storage and extraction. However, the stability and containment properties of the cavern maintain well during the operation period.

关 键 词：地下水封油库 循环荷载 花岗岩 岩石疲劳模型 稳定性 水封性 有限单元法 

分 类 号：TE822[石油与天然气工程—油气储运工程]