航运枢纽防渗措施优化

发布时间：2018-03-13 00:11

本文选题：姚家航运枢纽　切入点：渗流控制　出处：《水运工程》2016年12期 　论文类型：期刊论文

【摘要】：姚家枢纽是钱塘江中上游衢江干流六级梯级开发的最后一级航运枢纽。针对枢纽强透水地基渗流控制问题开展三维渗流数值模拟分析,比较渗流控制措施的具体几何尺寸及其防渗效果,优化防渗形式,并预报防渗措施下的浸没、绕渗和渗漏。结果表明:地基粉细砂和砂砾石为主要渗透通道,易发生渗透变形,枢纽三维绕渗特征明显,两岸地下水水位较高,两侧边坡出逸位置较高。防渗墙水平长度越长,堤防坡脚处渗透坡降越小,但防渗效果随着延伸长度逐步降低,建议选取合理的防渗长度为400~600 m。防渗墙措施下下游边坡依然有出逸,需采取包括护坡反滤在内的多种防渗措施,提高渗透稳定性。
[Abstract]:The Yaojia Hub is the last stage shipping hub for the sixth step development of the Qujiang mainstream in the middle and upper reaches of the Qiantang River. In view of the seepage control problem of the strong permeable foundation of the hub, the three-dimensional seepage numerical simulation analysis is carried out. By comparing the specific geometric dimensions of seepage control measures and their seepage control effects, optimizing the seepage control forms, and predicting the infiltration, surrounding seepage and seepage under the seepage control measures, the results show that the silt and gravel of the foundation are the main permeable channels, and the seepage deformation is easy to occur. The characteristics of 3D seepage around the embankment are obvious, the groundwater level is higher and the escape position of both sides of the slope is higher. The longer the horizontal length of the cutoff wall, the smaller the seepage slope at the foot of the embankment, but the effect of seepage prevention decreases gradually with the extension of the slope. It is suggested that the reasonable length of impervious is 400 ~ 600 m.The downstream slope still has escape under the anti-seepage wall measures, and many anti-seepage measures, including slope protection filter, should be taken to improve the seepage stability.
【作者单位】：南京水利科学研究院水文水资源与水利工程科学国家重点实验室通航建筑物建设技术交通行业重点实验室;
【基金】：国家重点研发计划(2016YFC0401901) 水利部堤防安全与病害防治工程技术研究中心开放基金(201506);水利部公益性行业科研专项(201401083);水利部“948”项目(201403)
【分类号】：TV61;TV223.4

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