基于离散裂隙网络的多期邻近地下洞库水封安全评价

王敬奎; 陈源; 张彬; 刘康能; 彭益; 孙哲; 王金昌; 彭振华

doi:10.19509/j.cnki.dzkq.tb20240486

基于离散裂隙网络的多期邻近地下洞库水封安全评价

doi: 10.19509/j.cnki.dzkq.tb20240486

王敬奎^1,,
陈源²,
张彬^3, ,,
刘康能³,
彭益³,
孙哲³,
王金昌¹,
彭振华¹

1.
中海油石化工程有限公司，山东青岛 266101
2.
长电新能有限责任公司，武汉 430000
3.
中国地质大学（北京）工程技术学院，北京 100083

基金项目: 国家自然科学基金项目（41972300）；中海油石化工程有限公司科研课题（KJFZ-3-2022FB-01）；基于新型电力系统下抽蓄电站规划布局及电力市场需求研究（Z422302039）

详细信息

作者简介:
王敬奎：E-mail：wangjk@cnooc.com.cn

通讯作者:
E-mail：sc_zhb@cugb.edu.cn

计量
- 文章访问数: 33
- PDF下载量: 10
- 被引次数: 0
出版历程
- 收稿日期: 2024-08-28
- 录用日期: 2025-01-02
- 修回日期: 2024-12-29
- 网络出版日期: 2025-12-18

Water seal safety evaluation of multi-period adjacent underground caverns based on discrete fracture network

1.
CNOOC Petrochemical Engineering Co., Ltd., Qingdao Shandong 266101, China
2.
China Yangtze Power Renewables Co., Ltd., Wuhan 430000, China
3.
School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China

More Information

Author Bio:
E-mail：wangjk@cnooc.com.cn

Corresponding author: E-mail：sc_zhb@cugb.edu.cn

摘要

摘要:
我国很多大型地下洞库都采用多期建设的方法，而扩建地下洞库可能会对邻近运营的同类洞库渗流场产生一定影响，导致油气外泄等一系列安全事故，因此保障扩建后的水封安全至关重要。以某大型地下洞库扩建项目为依托，分析库区地质条件和裂隙分布特征，考虑连通两期洞库的节理密集带，基于现场水文试验成果，反演裂隙等效开度，并基于离散裂缝网络（DFN）建立两期地下洞库简化模型，研究了扩建地下洞库的水封安全，同时进行了扩建地下洞库对运营洞库水封安全影响因素的研究。研究表明：本项目扩建洞库对运营洞库的水封安全没有影响，但节理密集带会严重影响扩建洞库的水封安全；且通过对扩建洞库对邻近运营洞库水封安全影响因素的研究，确定了洞库最小安全间距为200 m，垂直水幕压力和水平水幕压力设置为0.4 MPa时，可以保障扩建洞库与运营洞库的水封安全。因此，对于大型地下洞库扩建项目，节理密集带是影响水封安全的关键因素，确保最小安全间距和适当水幕压力设置，能有效保障扩建洞库与运营洞库的安全性。研究成果为大型地下洞库扩建工程可能遇到的水封安全问题提出了理论依据。
- 随机裂隙网络 /
- 地下洞室 /
- 洞室扩建 /
- 水封安全 /
- 安全距离
Abstract: Objective
Many large underground caverns in China will adopt a multi-stage construction method, and the expansion of underground caverns may have a certain impact on the seepage field of similar caverns near operation, potentially leading to a series of safety accidents such as oil and gas leakage. Therefore, ensuring the safety of the water seal after expansion is of critical importance.
Methods
In this paper, aimed at addressing this problem, the geological conditions and fracture distribution characteristics of the reservoir site area are analyzed based on a large underground cavern expansion project. Considering the joint dense zone connecting the two-stage caverns, and based on the field hydrological test results, the equivalent opening of the fracture is inverted. A simplified model of the two-stage underground caverns is then established using the random fracture network (DFN) approach. The water seal safety of the expanded underground caverns is studied, along with the influence of the expanded caverns on the water seal safety of the operating caverns.
Results
The research shows that the expanded caverns have no effect on the water seal safety of the operating caverns, but the joint dense zone will seriously affect the water seal safety of the expanded caverns. Through the study of the influence factors of the expansion of the oil depot on the water seal safety of the adjacent operating oil depot, it is determined that the minimum safety distance between the caverns is 200 m, and the vertical and horizontal water curtain pressures are set to 0.4 MPa. These settings can guarantee the water seal safety of both the expanded and operating caverns.
Conclusion
Therefore, for large-scale underground cavern expansion projects, the joint dense zone is the key factor affecting water seal safety. Ensuring a minimum safety distance and appropriate water curtain pressure can effectively ensure the safety of both the expanded and operating caverns. The results provide a theoretical basis for studying water seal safety in the expansion of large underground caverns.
- DFN /
- underground caverns /
- cavern enlargement /
- water-sealed properties /
- safe distance

HTML全文

图 1 地下水水位标高统计图

Figure 1. Groundwater level

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图 2 各随机种子模型侧窗面密度变化

Figure 2. Variation of side window density of each random seed model

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图 3 二维随机裂隙网络模型示意图

Figure 3. Schematic diagram of two-dimensional random fracture network model

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图 4 岩体裂隙等效开度反演计算结果

Figure 4. Inversion calculation results of equivalent aperture of rock fracture

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图 5 地下水封洞库裂隙网络模型示意图

Figure 5. Schematic diagram of fracture network model of underground water sealed oil storage

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图 6 全开挖水平测线裂隙水压力

Figure 6. Water pressure of full excavation horizontal line

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图 7 地下水位监测图

Figure 7. Groundwater level monitoring map

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图 8 不同间距下水平测线裂隙水压力

a. 两期洞库间距50 m；b. 两期洞库间距100 m；c. 两期洞库间距150 m；d. 两期洞库间距200 m

Figure 8. Water pressure of horizontal fracture line under different spacing

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图 9 不同间距下各洞室上方地下水位变化

Figure 9. Changes of groundwater level above each cavern under different spacing

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图 10 不同垂直水幕压力下水平测线裂隙水压力

Figure 10. Fissure water pressure of horizontal survey line under different vertical water curtain pressure

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图 11 不同垂直水幕压力下各洞室上方地下水位变化

Figure 11. Changes of groundwater level above each cavern under different vertical water curtain pressures

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图 12 不同水平水幕压力下水平测线裂隙水压力

Figure 12. Fissure water pressure of horizontal survey line under different horizontal water curtain pressure

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图 13 不同水平水幕压力下各洞室上方地下水位变化

Figure 13. Changes of groundwater level above each cavern under different horizontal water curtain pressures

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表 1 各组节理统计频数分布

Table 1. Statistical frequency distribution of each group of joints

参数名		节理1	节理2	节理3	节理4
倾向/(°)	范围	SW200°～SW290°	SE100°～SW190°	SE230°～SW280°	SE230°～SW280°
	期望μ	238	140	252	126
	标准差δ	17.6	20.5	12.2	14.6
倾角/(°)	范围	50～90	50～90	50～90	50～90
	期望μ	71	68	72	65
	标准差δ	8.3	8.1	9.21	6.2
迹长/m	范围	55～70	55～70	55～70	55～70
	期望μ	55	70	55	70
	标准差δ	9.37	12.16	9.37	11.25
线密度(条/m)		0.05	0.06	0.19	0.14

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表 2 岩石物理力学参数和裂隙参数

Table 2. Rock Physical and Mechanical Parameters

岩石物理力学参数	取值	裂隙参数	取值
密度/(kg/m³)	2620	法向刚度/(GPa/m)	0.95
体积模量/GPa	21	切向刚度/(GPa/m)	0.7
剪切模量/GPa	10.81	抗拉强度/MPa	2.52
抗压强度/MPa	91.84	粘聚力/MPa	0.13
抗拉强度/MPa	5.63	摩擦角/(°)	45.7
粘聚力/MPa	16.33
摩擦角/(°)	57.85

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表 3 各组节理等效开度取值

Table 3. Value table of equivalent opening of joints in each group

节理编号	水力开度/mm
节理编号	最大节理时	最小节理时	法向应力为0时
J1	3	0.01	0.43
J2	3	0.01	0.43
J3	3	0.01	1.18
J4	3	0.01	1.18

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