| 地下工程建设对岩溶水流场的影响及其修复 |
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| 引用本文： | 邢立亭,于苗,宿庆伟,赵振华,高扬,张云峰.地下工程建设对岩溶水流场的影响及其修复[J].地质科技通报,2022,41(5):242-254. |
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| 作者姓名： | 邢立亭 于苗 宿庆伟 赵振华 高扬 张云峰 |
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| 作者单位： | 1.济南大学水利与环境学院, 济南 250022 |
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| 基金项目： | 国家自然科学基金项目41772257济南市高校院所创新团队项目2018GXRC012 |
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| 摘 要： | 工程建设改变地下水流场危及建筑物的安全。以济南经十路沿线大型地下综合体为例, 通过数值模拟计算工程建设对地下水渗流场的影响, 并建立了地下水流场修复模型。结果表明: 地下空间结构会阻挡地下水运移, 地下水水位壅高造成地基承载力降低; 将地下工程设置导流措施后, 其迎水面水位随时间呈现衰减趋势, 且越接近天然状态水位衰减速率越慢; 因地层结构差异, 壅高水位基本回落的时间存在较大差异; 不同地质条件下流场修复所需导流井数量与导流几何体结构参数呈负相关关系, 所需导流井数量的预测方程反映了地质条件的复杂性和多变性。除导流几何体自身结构外, 围岩水力梯度与渗透系数对导水能力产生影响, 其中渗透系数大小制约导水速率的快慢, 水力梯度则控制导水行为的发生。导流措施的实施可减小工程建设对地下水环境的影响, 确保地下工程建设对水环境影响可控。
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| 关 键 词： | 岩溶区 地下工程 地下水 渗流 流场修复 |
| 收稿时间： | 2022-06-15 |
Influence and repair of underground engineering construction on karst flow field |
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| Affiliation: | 1.School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China2.Shandong Provincial Geo-mineral Engineering Exploration Institute, Jinan 250014, China |
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| Abstract: | Engineering construction changes the groundwater flow field and endanger the safety of buildings. Taking the large-scale underground complex along Jinan Jingshi Road as an example, the impact of engineering construction on the groundwater seepage field is obtained by numerical simulation, and the groundwater flow field repair models are established. These results show that the underground spatial structure will block the normal movement of groundwater, and will reduce the bearing capacity of the foundation after the groundwater level is raised. After adding diversion measures to the underground space, the water level at the upstream surface will decrease with time, and the closer it is to the natural state, the slower the water level attenuation rate is. Due to the difference in the stratum structure, there is a great difference in the time when the backwater level basically drops. The number of diversion wells required to repair the flow field under different geological conditions has a negative correlation with the structural parameters of diversion geometry. The established equation for predicting the number of diversion wells fully reflects the complexity and variability of geological conditions in karst areas. In addition to the structure of the fluid conducting geometry, the hydraulic gradient and permeability coefficient of the surrounding rock also affect the water conducting capacity of diversion measures. The permeability coefficient controls the speed of the water conducting rate, while the hydraulic gradient controls the occurrence of water conducting behavior. The implementation of diversion measures can reduce the impact of engineering construction on the groundwater environment and ensure that the impact of underground engineering construction on the water environment is controllable. |
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