钻孔桩泥浆脱水特性研究  

Research on dehydration performance of bored pile mud

作　　者：罗伟 李世汩 LUO Wei;LI Shi-mi(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan,Hubei 430040,China;Key Laboratory of Large-span Bridge Construction Technology of Ministry of Communications,Wuhan,Hubei 430040,China)

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430040 [2]长大桥梁建设施工技术交通行业重点实验室,湖北武汉430040

出　　处：《中国港湾建设》2024年第9期49-54,共6页China Harbour Engineering

基　　金：中交二航局企业科研项目(EHYF-2022-A-07-013)。

摘　　要：以新港高速公路双柳长江大桥钻孔桩泥浆为研究对象,分别选取同一钻孔桩的不同泥浆,开展了絮凝沉降试验、中压滤失试验,对比不同含水率下泥浆污泥比阻(SRF)、毛细吸水时间(CST),通过粒径分析仪、扫描电镜、X射线衍射等进行泥浆成分分析,研究钻孔桩泥浆脱水特性及影响的因素,以探究影响脱水特性的因素。结果表明:钻孔桩泥浆的沉降性能较差,投加PAM对改善沉降性能不显著。基于中压失水仪的泥浆失水量可以表征泥浆沉降性能,试验泥浆的SRF与CST存在一定线性相关性,相关性大小受泥浆脱水性能影响,越难脱水则相关性越好。泥浆特征粒径中,D50粒径对脱水特性影响最大,混入混凝土具有增大泥浆D50及以上粒径的效果,并增加泥浆中Ca、Mg、Si及Fe元素含量,改善泥浆脱水性能。Taking the bored pile mud of Shuangliu Yangtze River Bridge on Xingang Expressway as the research object,different mud of the same bored pile were selected to carry out flocculation settlement test and medium pressure filtration test,and the mud sludge specific resistance(SRF)and capillary water absorption time(CST)under different water content were compared.Particle size analyzer,scanning electron microscope and X-ray diffraction were used to analyze the composition in the mud,the dehydration performance and influencing factors of bored pile mud were studied to explore the factors affecting the dehydration performance.The results show that the settlement performance of bored pile mud is poor,and the addition of PAM has no significant effect on the improvement of settlement performance.Mud water loss based on medium pressure water loss instrument can reflect the mud settling performance.There is a certain linear correlation between SRF and CST of the test mud,and the correlation size is affected by the mud dehydration performance,the more difficult it is to dehydrate,the better the correlation.Among the characteristic particle size of mud,D50 particle size has the greatest influence on the mud dehydration characteristics.Mixing with concrete has the effect of increasing the particle size of mud D50 and above,and increasing the content of Ca,Mg,Si,and Fe elements in the mud to improve its dehydration performance.

关 键 词：钻孔桩 泥浆 脱水 比阻 毛细吸水时间 

分 类 号：U655.55[交通运输工程—港口、海岸及近海工程]