南昌红谷隧道临江富水砂层干坞基坑防渗墙施工技术

发布时间：2018-02-28 21:36

本文关键词： 红谷隧道临江干坞富水砂层沉管隧道塑性混凝土防渗墙　出处：《隧道建设》2015年10期 　论文类型：期刊论文

【摘要】：南昌红谷隧道干坞基坑深16 m,临赣江最近距离仅15 m,水位变化幅度达3~13 m,砂层渗透系数达120 m/d,防渗体系施工处于工期关键线路,防渗体系施工质量是实现基坑开挖、沉管预制、浮运、沉放等工期目标的重要保证。文章通过对塑性混凝土配合比、槽壁加固、成槽工艺、泥浆性能指标、清孔换浆、混凝土浇筑及墙体检测等的思考,提出了临江富水砂层干坞基坑防渗墙施工中三轴搅拌桩槽壁加固、配合比试配验证、"两钻两抓"成槽工艺、超声波仪成槽检验、高密度电法墙体检测以及膨润土泥浆性能指标、加强混凝土过程控制等主要施工方法和技术措施。通过在南昌红谷隧道临江富水砂层干坞基坑中的应用,证明塑性混凝土防渗墙止水防水效果非常好,为基底处理及沉管预制施工创造了良好的条件。
[Abstract]:The depth of dry dock foundation pit of Honggu tunnel in Nanchang is 16 m, the nearest distance near Ganjiang River is only 15 m, the change range of water level is 3 ~ 13 m, the permeability coefficient of sand layer is 120 m / d, the construction of anti-seepage system is in the key line during the construction period, the construction quality of anti-seepage system is to realize excavation of foundation pit and prefabrication of sinking pipe. Through the consideration of plastic concrete mix ratio, groove wall reinforcement, groove forming technology, mud performance index, clear hole and slurry replacement, concrete pouring and wall detection, etc. The paper puts forward three axis mixing pile wall reinforcement in the construction of impervious wall of foundation pit of dry-dock foundation pit with water-rich sand layer in Linjiang, matching test and verification, "two drillings and two grasping" grooving process, ultrasonic instrument grooving test, high-density electric wall testing and bentonite slurry performance index. Strengthening the concrete process control and other main construction methods and technical measures. Through the application in the foundation pit of the dry dock of the waterlogged sand layer in Nanchang Honggu tunnel, it is proved that the plastic concrete cutoff wall is very effective in water and waterproofing. Good conditions are created for foundation treatment and pipe sinking prefabrication.
【作者单位】：上海市政工程设计研究总院有限公司;中铁隧道集团二处有限公司;
【分类号】：U455.4

【参考文献】