南水北调中线工程弱膨胀土填方渠堤裂缝灌浆技术研究  

Study on crack grouting technology of weak expansive soil filling canal embankment in the Middle Route of South-to-North Water Transfer Project

作　　者：周学友 田振宇 宁昕扬 常兆广 孙统领 ZHOU Xueyou;TIAN Zhenyu;NING Xinyang;CHANG Zhaoguang;SUN Tongling(Head Section,Middle Branch of China South-to-North Water Diversion,Co.Ltd.,Nanyang 473000,China;Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China;Key Laboratory of Water Network Engineering and Dispatching,Ministry of Water Resources,Wuhan 430010,China)

机构地区：[1]中国南水北调集团中线有限公司渠首分公司,河南南阳473000 [2]长江勘测规划设计研究有限责任公司,湖北武汉430010 [3]水利部水网工程与调度重点实验室,湖北武汉430010

出　　处：《水利水电快报》2023年第9期51-56,共6页Express Water Resources & Hydropower Information

基　　金：南水北调中线渠首分局填方渠堤裂缝处理及施工技术研究项目(ZXJ/QS/YW/GG-2019-064);长江勘测规划设计研究院自主创新项目“水库大坝震后安全检查技术研究项目”(CX2021Z49)。

摘　　要：为探索适用于南水北调中线工程弱膨胀土填方渠堤裂缝的有效、快速灌浆修复方法,通过现场灌浆试验,设计并分析灌浆材料、浆液配比、灌浆压力和灌浆孔布置对裂缝灌浆效果的影响。结果表明:对于堤顶路面的细、浅裂缝,宜采用超细水泥、弱膨胀土、粉煤灰3种材料,按水固比1.0~1.2且水泥、粉煤灰、弱膨胀土分别占42%、28%、30%的浆液配比,以无压贴嘴灌浆方式进行修复;对于堤顶路面的细、深裂缝,宜选择同上的浆材和比例配置混合浆液,采用单排孔骑缝有压灌浆进行修复,孔距不大于1 m,灌浆压力控制在50 kPa以内;对于堤顶路面的宽、深裂缝,宜选择水泥、弱膨胀土2种材料,采取“先稀后稠”原则进行灌浆修复。研究成果可应用于后期的工程运行维护,并可为其他工程膨胀土填方渠堤裂缝修复提供参考。In order to explore an effective and rapid grouting repair method suitable for weak expansive soil filling canal embankment cracks in the jurisdiction of the Middle Route of South-to-North Water Diversion Project,the on-site grouting test methods was used to design and analyze the effects of grouting materials,slurry ratio,grouting pressure,and grouting hole arrangement on crack grouting effectiveness.The test results showed that:for the fine and shallow cracks on the embankment top road surface,the ultra-fine cement,weak expansive soil and fly ash were recommended for grouting,and the repair should be carried out by using a water-solid ratio of 1.0 to 1.2,cement slurry proportion of cement,fly ash,and weak expansive soil for 42%,28%,and 30%,respectively,and adopted non-pressure grouting method.For fine and deep cracks on the top of the embankment road surface,the same slurry material and proportion were recommended for grouting,and the pressure grouting with single row hole should be used for repairing the hole spacing of less than 1 m and a grouting pressure controlled within 50 kPa.For the wide and deep cracks on the embankment top road surface,cement and weak expansive soil were recommended for grouting,with the grouting repair principle of"thinning first and then thickening".The research results can be applied to the later engineering operation and maintenance,and can be a reference for repairing cracks in the expansive soil filled canal embankments in other projects.

关 键 词：弱膨胀土 填方渠堤 裂缝 灌浆修复 施工工艺 南水北调中线工程 

分 类 号：TV543[水利工程—水利水电工程]