王敬奎,刘杰,王者超,等. 非均匀岩层中高压储气库受力特征模拟[J]. 油气储运,2025,x(x):1−9.
引用本文: 王敬奎,刘杰,王者超,等. 非均匀岩层中高压储气库受力特征模拟[J]. 油气储运,2025,x(x):1−9.
WANG Jingkui, LIU Jie, WANG Zhechao, et al. Numerical simulation of stress characteristics of high-pressure gas storage within heterogeneous rock formations[J]. Oil & Gas Storage and Transportation, 2025, x(x): 1−9.
Citation: WANG Jingkui, LIU Jie, WANG Zhechao, et al. Numerical simulation of stress characteristics of high-pressure gas storage within heterogeneous rock formations[J]. Oil & Gas Storage and Transportation, 2025, x(x): 1−9.

非均匀岩层中高压储气库受力特征模拟

Numerical simulation of stress characteristics of high-pressure gas storage within heterogeneous rock formations

  • 摘要:
    目的 地下内衬岩石洞室LRC(Lined Rock Cavern)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。依托现在地下储气库工程,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和变形较大需要关注,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类围岩中的储气库的稳定性较好,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,且随着围岩性质变差,变形增加的幅度变大;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。

     

    Abstract:
    Objective Gas storage using lined rock caverns (LRC) has emerged as an innovative method for underground gas storage. Naturally constructed within caverns manually excavated in underground rock formations, LRC gas storage exhibits several characteristics, including versatile applications, large storage capacities, and high safety levels. These unique advantages position LRC gas storage as an effective solution to challenges faced in modern energy security and storage.
    Methods LRC gas storage is situated within complex underground rock formations at significantly varying burial depths, where the distribution of rock strata is heterogeneous. This study developed a numerical model for medium- to high-pressure gas storage in such heterogeneous rock formations, based on an existing underground gas storage facility. Special attention was paid to the geological conditions of this facility, and typical surrounding rock types (Classes I, II, III, and IV) were selected for modeling. The model accounts for scenarios with both soft upper and hard lower strata, as well as hard upper and soft lower strata, incorporating varying boundary levels between rock layers. Utilizing this model, analyses were conducted to investigate the stress and deformation characteristics of LRC gas storage under elevated internal pressure.
    Results These analyses focused on the stress states affecting the steel lining, rebars, concrete lining, and surrounding rock of the gas storage under varying stratum conditions. The results indicated that, under typical stratum conditions, the stress on the steel lining remains below its failure strength, with tensile stress being the predominant factor. Additionally, the stress and deformation in gas storage situated within Class IV surrounding rock are significant, highlighting the need for special attention. In contrast, gas storage surrounded by Classes I, II, and III maintains healthy stress states, with rock deformation and plastic zones primarily developing in the weaker layers of the surrounding rock.
    Conclusion In general, the steel lining and rebars used in gas storage within heterogeneous rock formations rarely approach their failure strength, contributing to overall stability. However, given that lining is susceptible to tensile failure, special attention is required to address potential cracking. Gas storage demonstrates greater stability when situated in formations with hard upper and soft lower strata. In cases where gas storage is located within Class IV surrounding rock, the steel lining may experience stress that approaches its yield strength and is subject to significant deformation in the surrounding rock. Conversely, gas storage in the surrounding rock of Classes II and III exhibits improved stability, with more attention required for the weaker layers. Deformation in gas storage is significant within these weak layers, with deformation amplitudes increasing as the surrounding rock deteriorates. Additionally, the surrounding rock exhibits a linear decrease in the maximum plastic strain as the boundary level between rock layers rises.

     

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