摘要
杭州未来规划33条过江通道,多数采用泥水盾构技术,因为泥浆会在开挖面形成阻止地下水的泥膜。在实际工程中,钱塘江粉土会混入泥浆导致泥浆和泥膜的特性发生变化,可能导致工程事故的发生,针对这一现象,系统探讨钱塘江粉土对泥浆性能和泥膜渗透特性的影响,通过滤失试验分析比较16种不同压力下的泥浆试样,获得了泥膜的孔隙比-渗透系数-压力的相互关系参数,并计算了不同压力下不同泥浆形成的泥膜渗透系数。加入钱塘江粉土后,含有PAA-Na(1200)的泥浆粘度增大最明显,增大了1.79倍;而含有CPAM的泥浆所生成的泥膜平均渗透系数增大172倍,含有APAM的泥浆渗透系数缩小为原来1/20。钱塘江粉土的加入可能导致同样压力变化下渗透系数变化更小,为预防相关工程问题提供科学依据与解决方案。
According to the future plan of Hangzhou,33 crossing river passways will be built under.Hangzhou plans river crossing channels in the future,most of which would use mud water shield tunneling technology that a mud film is formed on the excavation surface to prevent groundwater.In practical engineering,the mixing of Qiantang River silt with mud causes changes in the characteristics of mud and mud film,which may lead to engineering accidents.In response to this phenomenon,this paper systematically explores the impact of Qiantang River silt on mud performance and mud film permeability characteristics,By analyzing and comparing 16 mud samples under different pressures through filtration tests,the correlation parameters of pore ratio permeability coefficient pressure of the mud membrane are obtained,and the permeability coefficient of the mud membrane formed by different mud under different pressures is calculated.After adding the Qiantang River silt,the viscosity of the mud containing PAA Na(1200)increased by 1.79 times.The average permeability coefficient of the mud film generated by mud containing CPAM increases by 172 times,while the permeability coefficient of mud containing APAM decreases to 1/20 of the original.The addition of Qiantang River silt may result in smaller changes in permeability coefficient under the same pressure changes.The aiming to provide scientific basis and solutions for preventing related engineering problems.
作者
詹杰
陆中杰
王可
陈俊羽
尹鑫晟
ZHAN Jie;LU Zhongjie;WANG Ke;CHEN Junyu;YIN Xinsheng(Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province,Hangzhou 310015,China;Hangzhou City University,Hangzhou 310015,China;Zhejiang Engineering Research Center of Intelligent Urban Infrastructure,Hangzhou 310015,China;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Anhui Huainan 232001,China)
出处
《低温建筑技术》
2024年第2期124-128,共5页
Low Temperature Architecture Technology
基金
浙江省自然科学基金资助项目(LY21E080004)
大学生创新创业训练项目(X202103067)
大学生创新创业训练项目(CK202103015)
校科研培育基金课题(J-202211)。
关键词
钱塘江粉土
泥水盾构
泥膜
开挖面稳定
泥浆配方
qiantang river silt
slurry shield
filter cake
tunnel face stability
slurry formula
