济南市华山湖开挖建设渗漏分析研究

Leakage Analysis and Study in Excavation Construction of Huashanhu Lake in Jinan City

该文在查明区域水文地质条件、湖区地下水的类型、分布、埋藏条件、含水层及隔水层特征、岩性结构以及地下水的补给、径流、排泄条件的基础上,通过现场试验,确定了天然状态下湖区各含水层之间的水力联系、黄河侧渗补给量及湖区向小清河的排泄量,结合数值模拟,预测了湖区维持设计蓄水位21.5m时黄河的侧渗补给量、湖区向小清河的排泄量及湖区对周边地下水位的影响。结果表明,天然状态下,黄河侧渗补给量为748.23m^3/d,湖区向小清河排泄量大约为52.03m^3/d,黄河侧渗补给量远大于湖区向小清河的排泄量。数值模拟结果表明,湖区维持设计蓄水位21.5m时,不同水文年湖区接受的侧渗补给量均大于湖区的渗漏量,且对周围地下水位的影响不超过1.5m,因此,湖区维持设计蓄水位21.5m时可不考虑防渗措施。

In this paper, on the basis of identifying regional hydrogeological conditions, the types, distribu tion, buried conditions, characteristics of water bearing layers and aquifer, lithologic structure, and the conditions of recharge, runoff and excretion of groundwater, hydraulic connection between the water bear ing layers in the lake area and the seepage supplement in the Yellow River have been determined by the field test. Combining the lateral infiltration recharge of the Yellow River, the discharge amount of the lake area to Xiaoqing River with the numerical simulation, lateral infiltration recharge, the discharge of the lake area to the Xiaoqing River and the influence of the lake area on the surrounding groundwater level when the design level of the lake area is 21.5m have been predicated. It is showed that the lateral infiltra tion recharge of the Yellow river is 748.23m3/d in the natural state, the drainage of the lake area to Xiao qing river is about 52.03m3/d, and the lateral infiltration recharge of the Yellow river is far greater than that of the lake area to Xiaoqing river. As showed by the numerical simulation, the lateral infiltration re charge is larger than the leakage in the lake area in different hydrological years when the design of the wa ter level is 21.5m. The influence on the surrounding groundwater level is not more than 1.5m. Therefore, seepage prevention measures can not be considered when the design level is 21.5m in the lake area.