Analysis and utilization of groundwater level monitoring data of underground water-sealed caverns
ZHANG Yihu1, LIU Qian1*, GAO Ximin2, DING Changdong1, LUO Rong1, HU Wei1
1. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan 430010, Hubei, China; 2. Sinopec Pipeline Storage and Transportation Co., Ltd., Xuzhou 221008, Jiangsu, China
Abstract: Based on groundwater level data of 35 monitoring boreholes from 2015 to 2020 obtained from a large-scale underground water-sealed cavern project, the characteristics and causes of the changes in the groundwater level were systematically analyzed. Taking the construction progress of each cavern unit and geological structure information obtained from previous survey into account, those monitoring data revealed the influence of underground cavern excavation and artificial water curtain system on groundwater level, and the possible risk areas of low water pressure. According to the corresponding relationship between the temporal changes of groundwater level and construction progress, the monitoring boreholes could be divided into three types: water level maintains relatively stable,water level declines when adjacent tunnels were excavated; water level declines far after the adjacent tunnels were excavated. Combined with the spatial distribution of boreholes and the construction progress of underground caverns, it could be found that the groundwater level in the overall study area declined after the excavation of the underground caverns. However, benefited by the artificial water curtain, groundwater level in most area maintained higher than the safe water level(-25 m). Affected by faults F2, F3 and joint fracture zones L4, L8, local groundwater level in the southwest was still far below the safe water level(-25 m)at the end of monitoring, and it indicated a risk of insufficient water sealing. It indicated that the dynamics of the groundwater level in the study area was closely related to the construction progress and quality of the underground caverns, and the systematic monitoring of the groundwater level and timely analysis and feedback were essential. It is urgent to compile a specification for the underground water monitoring of the water-sealed cavern to promote more systematic monitoring of groundwater and improve the construction efficiency of the project.
张宜虎,刘倩,高锡敏,丁长栋,罗荣,胡伟. 水封洞库地下水位监测资料分析与利用[J]. 隧道与地下工程灾害防治, 2024, 6(1): 24-35.
ZHANG Yihu, LIU Qian, GAO Ximin, DING Changdong, LUO Rong, HU Wei. Analysis and utilization of groundwater level monitoring data of underground water-sealed caverns. Hazard Control in Tunnelling and Underground Engineering, 2024, 6(1): 24-35.
[1] ÅBERG B. Model tests on oil storage in unlined rock caverns[M] // BERGMAN M. Storage in Excavated Rock Caverns: Rockstore 77: Proceedings of the First International Symposium, Stockholm, 5-8 September 1977. Oxford: Pergamon Press, 1978: 517-530. [2] WANG Z C, LI W, LI Z, et al. Groundwater response to oil storage in large-scale rock caverns with a water curtain system: site monitoring and statistical analysis[J]. Tunnelling and Underground Space Technology, 2020, 99: 103363. [3] ZHANG Q H, LIU Q B, SU A J, et al. Hydraulic conductivity of rock masses surrounding water curtain boreholes for underground oil storage caverns[J]. Energies(Basel), 2021,14(15):4588. [4] ÅBERG B. Prevention of gas leakage from unlined reservoirs in rock[M] // BERGMAN M. Storage in Excavated Rock Caverns: Rockstore 77: Proceedings of the First International Symposium, Stockholm, 5-8 September 1977. Oxford: Pergamon Press, 1978: 399-413. [5] GOODALL D C, ÅBERG B, BREKKE T L. Fundamentals of gas containment in unlined rock caverns[J]. Rock Mechanics and Rock Engineering, 1988, 21(4): 235-258. [6] LIANG J, LINDBLOM U. Analyses of gas storage capacity in unlined rock caverns[J]. Rock Mechanics and Rock Engineering, 1994, 27(3): 115-134. [7] The British Standards Institution. Gas infrastructure-underground gas storage-part 4: functional recommendations for storage in rock caverns: BS/EN 1918-4: 2016[S]. London:BSI Standards Institution, 2016. [8] 中国石油化工集团有限公司. 地下水封石洞油库设计标准: GB/T 50455—2020[S]. 北京: 中国计划出版社, 2020. [9] 中石化上海工程有限公司.地下水封石洞油库水幕系统设计规范: SH/T 3211—2020[S]. 北京: 中国石化出版社,2020. [10] WANG Z C, LI S C, QIAO L P. Design and test aspects of a water curtain system for underground oil storage caverns in China[J]. Tunnelling and Underground Space Technology, 2015, 48: 20-34. [11] S. DI GIANDOMENICO. GKF/I/D/0002 GEOSTOCK 地下工程通用规范 GSU-21 洞库验收及第一次LPG入库[S].索奕,译. [S.l.] : [s.n.] , 2005. [12] LEE C I, SONG J J. Rock engineering in underground energy storage in Korea[J]. Tunnelling and Underground Space Technology, 2003, 18(5): 467-483. [13] 蒋中明, 肖喆臻, 唐栋, 等. 基于裂隙渗流效应的水封油库涌水量预测分析[J]. 岩土力学, 2022, 43(4): 1041-1047. JIANG Zhongming, XIAO Zhezhen, TANG Dong, et al. Prediction of water inflow in water-sealed oil storage caverns based on fracture seepage effect[J]. Rock and Soil Mechanics, 2022, 43(4): 1041-1047. [14] LI Z K, LU B Q, ZOU J, et al. Design and operation problems related to water curtain system for underground water-sealed oil storage caverns[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2016, 8(5): 689-696. [15] SHI L, ZHANG B, WANG L, et al. Functional efficiency assessment of the water curtain system in an underground water-sealed oil storage cavern based on time-series monitoring data[J]. Engineering Geology, 2018, 239: 79-95. [16] LI Z Q, XUE Y G, LIANG J Y, et al. Performance assessment of the water curtain system: a monitoring system in an underground water-sealed oil reservoir in China[J]. Bulletin of Engineering Geology and the Environment, 2020, 79(7): 3635-3648. [17] CHUNG I M, KIM T, LEE K K, et al. Efficient method for estimating groundwater head in the vicinity of the underground gas storage caverns in fractured media[J]. Journal of Hydrologic Engineering, 2009, 14(3): 261-270. [18] JO Y J, LEE J Y. Time series analysis of hydrologic data obtained from a man-made undersea LPG cavern[J]. Engineering Geology, 2010, 113(1/2/3/4): 70-80. [19] KUROSE H, IKEYA S, CHANG C S, et al. Construction of Namikata underground LPG storage cavern in Japan[J]. International Journal of the JCRM, 2014, 10(2): 15-24. [20] LI Y T, ZHANG B, WANG L, et al. Key issues in water sealing performance of underground oil storage caverns: advances and perspectives[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2023, 15(10): 2787-2802. [21] 张奇华. 关于黄岛国家石油储备库水封效果评价和控制的几点认识[J]. 长江科学院院报, 2014, 31(8): 112-116. ZHANG Qihua. Some ideas on assessment and control of water tightness effect in Huangdao Oil Storage Cavern[J]. Journal of Yangtze River Scientific Research Institute, 2014, 31(8): 112-116. [22] 张人权, 梁杏, 靳孟贵, 等. 水文地质学基础[M]. 6版. 北京: 地质出版社, 2011. [23] YOSRI A, DICKSON-ANDERSON S, SIAM A, et al. Transport pathway identification in fractured aquifers: a stochastic event synchrony-based framework[J]. Advances in Water Resources, 2021, 147: 103800. [24] MA K, ZHUANG D Y, ARGILAGA A, et al. A new approach to identifying preferential seepage channels for underground water-sealed oil storage cavern during construction[J]. Rock Mechanics and Rock Engineering, 2023, 56(9): 6395-6410. [25] KIM T, LEE K K, KO K S, et al. Groundwater flow system inferred from hydraulic stresses and heads at an underground LPG storage cavern site[J]. Journal of Hydrology, 2000, 236(3-4): 165-184.