摘要
针对软基河床锁坝截流中基础抗冲性差、当地石材匮乏等问题,提出网箱混合截流技术方案,即首先平抛砂袋自然沉降固结护底,再沿锁坝轴线两侧搭建桩与竹格栅联合构成网箱,最后在网箱中通过人工抛投砂袋立堵实现截流,解决了基础平台搭建、动水条件下土工布铺设、裹头连接、合龙闭气等关键技术。截流分三期进行:一期在原河床上抛填砂袋填筑截流基础平台,使河床软基挤密、沉降、固结,形成一级水下砂袋坝;二期在枯水期对基础平台实施土工布抗冲防护,修建龙口裹头,填筑与两岸连接戗堤并填土闭气;三期采用研发的网箱型整体结构实施立堵截流闭气。该方案对于石材匮乏地区软基截流工程具有很好的技术经济性。
Aimed at the problems of poor foundation antiscourability and lack of local stone in the closure of lock dam in soft foundation river bed,the technical scheme of net cage mixed closure was put forward.The first step was to dump sand bags and consolidate through natural settlement for bottom protecting.Then the net cage composed of pile and bamboo grid was built along both sides of the axis of lock dam.Finally the closure was realized by manually throwing sand bag in the net cage.The key technologies,such as the basic platform construction,the geotextile laying under dynamic water condition,wraphead connection and airclosure were solved.The closure was carried out by three phases.In the first stage,sand bags were dumped into the original river bed to fill the closure foundation platform,so that the soft foundation of riverbed was squeezed and consolidated to form a firstclass underwater sandbag dam.In the second stage,the foundation platform was protected against erosion by geotextile,the wraphead was built and the berm connected with both banks was filled and the airclosure was completed in the dry season.In the third stage,the overall structure of the net cage was adopted to implement vertical closure and airclosure.The scheme has a good technical economy for the soft foundation closure project in stone deficient areas.
作者
梁羽飞
任高飞
汪自力
于国卿
LIANG Yufei;REN Gaofei;WANG Zili;YU Guoqing(The First Engineering Bureau of Henan Water Conservancy,Zhengzhou 450000,China;Research Center on Levee Safety and Disaster Prevention,MWR,Zhengzhou 450003,China)
出处
《人民黄河》
CAS
北大核心
2020年第8期40-44,共5页
Yellow River
基金
国家重点研发计划项目(2016YFC0401610)
河南省水利科研攻关计划项目(GG201733)。
关键词
软基河床
网箱截流
施工工艺
Nalian河
soft foundation
net cage closure
construction technology
Nalian River
