基于流固耦合的围岩后注浆对大型水封石油洞库水封性影响分析

基于多孔弹性连续介质流固耦合理论，通过合理选取围岩主要物理力学参数，建立了大型石油储备地下水封洞库全断面开挖后洞室涌水量计算模型，利用大型商业软件Comsol对黄岛国家石油储备地下水封洞库地下水渗流场和位移场进行数值模拟分析。通过不同注浆方案及不同注浆厚度情况下地下水渗流量的比较分析发现，并不是注浆圈的厚度越大对洞室渗水量的控制效果越好，而是存在相对经济合理的阈值。研究表明，最佳的注浆方式是形成全断面闭合注浆圈，最佳注浆厚度为5 m。

Analysis of impact of surrounding rock post-grouting for large oil cavern on its water seal ability based on fluid-solid coupling

By properly selecting the main physical and mechanical parameters of surrounding rock, a model for calculating water inflow of a large underground water seal oil cavern after the whole section excavation is established based on porous elastic continuum fluid-solid coupling theory. And the groundwater seepage field and displacement field of Huangdao oil storage underground water seal cavern are analyzed with numerical simulation. By the comparative analysis of different grouting mode and different thickness of grouting case, it is found that it is not a fact that the greater the thickness of grouting circle of cavern, the better control effect of the seepage flow. There is a relatively economic and reasonable threshold. The results show that the best way of post-grouting is to form a whole section closing grouting circle, and the best thickness of grouting is 5 meters.