【目的】地下内衬岩石洞室(Lined Rock Cavern,LRC)储气库是一种新型的储气方式,其通过在地下岩层中人工挖掘洞室来建造天然气储气库,地下LRC储气库具备适用范围广、存储量大以及安全性高等特点,在解决现代能源安全与存储问题上具有独...【目的】地下内衬岩石洞室(Lined Rock Cavern,LRC)储气库是一种新型的储气方式,其通过在地下岩层中人工挖掘洞室来建造天然气储气库,地下LRC储气库具备适用范围广、存储量大以及安全性高等特点,在解决现代能源安全与存储问题上具有独特优势。【方法】地下岩层性质复杂,大罐式储气库沿高度方向埋深变化大,岩层分布不均。依托现有地下储气库工程,参考工程中的地质条件,选择典型的围岩种类(Ⅰ类、Ⅱ类、Ⅲ类、Ⅳ类),考虑上软下硬、上硬下软岩层条件以及不同岩层分界线高度情况,建立不均匀岩层中高压储气库数值模型,分析高内气压下大罐式储气库受力与变形情况。【结果】分析不同岩层条件下储气库中钢衬、钢筋、混凝土衬砌以及围岩受力状态发现,常见岩层条件下储气库中钢衬受力不会超过破坏强度,衬砌受力以拉应力为主,同时Ⅳ类围岩中储气库受力与变形较大,而Ⅰ、Ⅱ、Ⅲ类围岩的储气库受力状态良好,其中围岩变形与塑性区大多出现在围岩软弱层中。【结论】一般非均匀岩层中储气库的钢衬与钢筋不会达到破坏强度,稳定性较好,而衬砌容易发生受拉破坏,需要关注衬砌开裂情况;储气库在上硬下软岩层中更为稳定;Ⅳ类围岩中储气库钢衬受力达屈服强度,且围岩变形较大,而Ⅱ、Ⅲ类围岩中的储气库稳定性较好,需要对软弱层部分多加关注;储气库在围岩软弱层中变形较大,且变形增加的幅度随着围岩性质变差而变大;随着岩层分界线高度提高,围岩中最大塑性应变呈现线性减小的趋势。展开更多
This study investigates the mechanical response of an underground cavern subjected to cyclic high gas pressure,aiming to establish a theoretical foundation for the design of lined rock caverns(LRCs)for energy storage ...This study investigates the mechanical response of an underground cavern subjected to cyclic high gas pressure,aiming to establish a theoretical foundation for the design of lined rock caverns(LRCs)for energy storage with high internal pressure,e.g.compressed air energy storage(CAES)underground caverns or hydrogen storage caverns.Initially,the stress paths of the surrounding rock during the excavation,pressurization,and depressurization processes are delineated.Analytical expressions for the stress and deformation of the surrounding rock are derived based on the MohreCoulomb criterion.These expressions are then employed to evaluate the displacement of cavern walls under varying qualities of surrounding rock,the contact pressure between the steel lining and the surrounding rock subject to different gas storage pressures,the load-bearing ratio of the surrounding rock,and the impact of lining thickness on the critical gas pressure.Furthermore,the deformation paths of the surrounding rock are evaluated,along with the effects of tunnel depth and diameter on residual deformation of the surrounding rock,and the critical minimum gas pressure at which the surrounding rock and the lining do not detach.The results indicate that residual deformation of the surrounding rock occurs after depressurization under higher internal pressure for higher-quality rock masses,leading to detachment between the surrounding rock and the steel lining.The findings indicate that thicker linings correspond to higher critical minimum gas pressures.However,for lower-quality surrounding rock,thicker linings correspond to lower critical minimum gas pressures.These findings will provide invaluable insights for the design of LRCs for underground energy storage caverns.展开更多
文摘【目的】地下内衬岩石洞室(Lined Rock Cavern,LRC)储气库是一种新型的储气方式,其通过在地下岩层中人工挖掘洞室来建造天然气储气库,地下LRC储气库具备适用范围广、存储量大以及安全性高等特点,在解决现代能源安全与存储问题上具有独特优势。【方法】地下岩层性质复杂,大罐式储气库沿高度方向埋深变化大,岩层分布不均。依托现有地下储气库工程,参考工程中的地质条件,选择典型的围岩种类(Ⅰ类、Ⅱ类、Ⅲ类、Ⅳ类),考虑上软下硬、上硬下软岩层条件以及不同岩层分界线高度情况,建立不均匀岩层中高压储气库数值模型,分析高内气压下大罐式储气库受力与变形情况。【结果】分析不同岩层条件下储气库中钢衬、钢筋、混凝土衬砌以及围岩受力状态发现,常见岩层条件下储气库中钢衬受力不会超过破坏强度,衬砌受力以拉应力为主,同时Ⅳ类围岩中储气库受力与变形较大,而Ⅰ、Ⅱ、Ⅲ类围岩的储气库受力状态良好,其中围岩变形与塑性区大多出现在围岩软弱层中。【结论】一般非均匀岩层中储气库的钢衬与钢筋不会达到破坏强度,稳定性较好,而衬砌容易发生受拉破坏,需要关注衬砌开裂情况;储气库在上硬下软岩层中更为稳定;Ⅳ类围岩中储气库钢衬受力达屈服强度,且围岩变形较大,而Ⅱ、Ⅲ类围岩中的储气库稳定性较好,需要对软弱层部分多加关注;储气库在围岩软弱层中变形较大,且变形增加的幅度随着围岩性质变差而变大;随着岩层分界线高度提高,围岩中最大塑性应变呈现线性减小的趋势。
基金supported by the State Key Laboratory of Disaster Reduction in Civil Engineering(Grant No.SLDRCE23-02)Ningbo PublicWelfare Fund Project(Grant No.2023S100)the National Key Research and Development Program of China(Grant No.2024YFE0105800).
文摘This study investigates the mechanical response of an underground cavern subjected to cyclic high gas pressure,aiming to establish a theoretical foundation for the design of lined rock caverns(LRCs)for energy storage with high internal pressure,e.g.compressed air energy storage(CAES)underground caverns or hydrogen storage caverns.Initially,the stress paths of the surrounding rock during the excavation,pressurization,and depressurization processes are delineated.Analytical expressions for the stress and deformation of the surrounding rock are derived based on the MohreCoulomb criterion.These expressions are then employed to evaluate the displacement of cavern walls under varying qualities of surrounding rock,the contact pressure between the steel lining and the surrounding rock subject to different gas storage pressures,the load-bearing ratio of the surrounding rock,and the impact of lining thickness on the critical gas pressure.Furthermore,the deformation paths of the surrounding rock are evaluated,along with the effects of tunnel depth and diameter on residual deformation of the surrounding rock,and the critical minimum gas pressure at which the surrounding rock and the lining do not detach.The results indicate that residual deformation of the surrounding rock occurs after depressurization under higher internal pressure for higher-quality rock masses,leading to detachment between the surrounding rock and the steel lining.The findings indicate that thicker linings correspond to higher critical minimum gas pressures.However,for lower-quality surrounding rock,thicker linings correspond to lower critical minimum gas pressures.These findings will provide invaluable insights for the design of LRCs for underground energy storage caverns.
