| 输水交叉建筑物进出口段渗漏成因综合分析 |
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| 引用本文： | 胡江,王春红,马福恒.输水交叉建筑物进出口段渗漏成因综合分析[J].水利水运工程学报,2022,0(6):137-145. |
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| 作者姓名： | 胡江 王春红 马福恒 |
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| 作者单位： | 1.南京水利科学研究院，江苏 南京 210029 |
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| 基金项目： | 国家自然科学基金资助项目（52179138，51879169，51779155）；南京水利科学研究院中央级公益性科研院所基本科研业务费专项资金资助项目（Y720002，Y720003） |
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| 摘 要： | 输水交叉建筑物进出口段渗流异常成因存在不确定性。采用综合分析方法探讨某长距离调水工程一跨河渡槽出口段裹头渗漏的成因。在巡视检查和加固处理等资料分析的基础上，构建统计模型，定量分析渐变段渗透压力和底板扬压力与渠道水位、气温、降雨量等环境量的关系，判断渗流的主要影响因素；通过变形监测资料分析，结合工程地质和水文地质条件，判断引起裹头渗漏的原因；进而依据流场法、探地雷达和高密度电阻率法等地球物理探测方法揭示渗漏入口和通道等。综合分析认为，渗漏从渐变段末端结构缝进入，通过渐变段、闸室段和连接段的砂砾石层基础向裹头侧流出。考虑到该调水工程常年运行，渡槽难以停水检修，提出在闸室段增加灌浆帷幕截断渗流通道的防渗加固处置建议方案。采用的综合分析方法可为同类工程问题分析和处理提供参考。
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| 关 键 词： | 交叉建筑物 渐变段 渗漏 沉降差 成因分析 |
| 收稿时间： | 2021-10-22 |
Comprehensive analysis for leakage cause of the entry and outlet sections of the water-conveyance crossing structures |
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| Affiliation: | 1.Nanjing Hydraulic Research Institute, Nanjing 210029, China2.Nanjing R & D Hydro-Information Technology Company, Nanjing 210029, China |
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| Abstract: | There is uncertainty for the cause of the abnormal seepage flow in the entry and outlet sections of the water-conveyance crossing structures. A comprehensive analysis method was proposed to explore the leakage cause in the outlet section of a cross-river aqueduct in a long-distance water transfer project in this research. First, the operation management data such as patrol inspection and reinforcement measure were analyzed. A statistical model was constructed to quantitatively analyze the relationship between the seepage pressure in the transition section and the uplift pressure beneath the sluice chamber, and the cannel water level, temperature, rainfall and other environmental variables. The main influencing factors of the seepage variables were preliminarily judged by the above-mentioned qualitative and quantitative analysis. Second, considering the engineering geology and hydrogeological conditions, the leakage cause of the protective structure could be further judged through the analysis of the surface deformation monitoring data. Then the leakage entrance and leakage channel was revealed based on several geophysical detection methods such as flow field method, ground penetrating radar and high-density resistivity method. Finally, according to the comprehensive analysis, it was found concluded that the leakage entered from the structural joints at the end of the transition section, and leaked out to the protective structure through the sand and gravel layer foundation of the transition section, the sluice chamber section and the connecting section. Considering the long-term operation of the water transfer project, it was difficult to stop water transfer for the aqueduct maintenance. Therefore, the anti-seepage reinforcement treatment plan, namely adding a grouting curtain to block the seepage channel beneath the sluice chamber, was proposed. The adopted comprehensive analysis method can provide reference for the analysis and treatment of similar engineering problems. |
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