【作者】 胡伏元；

【导师】 卢廷浩；

【作者基本信息】 河海大学 ， 建筑与土木工程， 2003， 硕士

【摘要】 防渗墙作为堤防防渗处理的主要工程措施，在长江中下游堤防加固工程中得到了广泛的运用。同时由于防渗墙阻断或减弱了堤内地下水与堤外江水渗流互补的水力联系，特别是建设大规模连续防渗墙可能对地下水动力场、水化学场以及地下水资源等产生影响。而是否会因为防渗墙的阻隔，地下水长时间得不到排泄而产生浸没，造成农田盐碱化、沼泽化和地温降低等一系列水环境问题，均系堤防建设区各级政府、沿江居民和国内外部分工程及水文地质专家、农业与环境保护专家共同关心的话题。长江中下游堤防防渗墙截渗对地下水环境的影响涉及范围较广，同时也是一个长期的过程。本课题研究的难点在于长江中下游堤基工程地质条件差异较大，影响地下水动力场、水化学场的因素不仅与堤基地质结构、地形与河网分布、降水入渗及蒸发条件，而且与防渗墙的设计方案、施工工法及施工质量等密切相关。本课题的特色是在水文、工程地质勘察基础上，经一个水文年长期水位监测，经综合分析研究后，建立地下水动力场和化学特征系统，通过选择代表性堤段对防渗墙建造前后地下水位和水质进行监测，评价和预测防渗墙建设对地下水环境是否存在不良影响以及影响的程度和范围。更多还原

【Abstract】 As primary engineering measure, impermeable wall is applied broadly to reinforcing dike in middle-lower reaches of Yangtze River. Impermeable wall interdicts or weakens waterpower contact of seepage intercomplementarity between groundwater inside dike and river outside dike. Especially, mass continuous concrete wall may have made effect on groundwater power field, chemistry field and water resource. Because of obstructing by impermeable wall, groundwater drainaged long time brings about immersion, whether or not this will result in a series of water surroundings problems, such as farmland salinization, marsh, lowering of ground temperature and so on, which are all focused on by government, resident, experts in engineering, hydrogeology, agriculture and surroundings.The influence of cutting infiltration to groundwater surroundings by impermeable wall of dike in middle-lower reaches of Yangtze River is abroad, and also is a long process. The difficulties of this problem are as follows: there is a grate discrepancy of geology condition of dike in middle-lower reaches of Yangtze River, the facts which affect groundwater power field and water chemistry field not only include geologic structure of dike, topography and river network, precipitation infiltration and evaporation condition, but also are closely related to the design scheme of impermeable wall, construction method and construction quality.Based on hydrogeology and engineering geology reconnaissance, this problem constructs groundwater power field and system of chemistrycharacteristic through comprehensive analysis and research. Monitoring groundwater table and water quality by means of choosing representative dike section, the paper appraises and forecasts that the influence to groundwater surroundings by building impermeable wall is or not unhealthy include the lever and the scope.更多还原