泥浆粗粒材料对泥水盾构泥膜闭气时间的影响  

Effects of coarse material in slurry on the airtightness time for the filter cake in slurry shield tunneling

作　　者：刘成[1,2,3] 郭建祥[1] 陆杨[1] 高玉峰[2] 

机构地区：[1]南京林业大学土木工程学院,南京210037 [2]岩土力学与堤坝工程教育部重点实验室,南京210098 [3]莫纳什大学工程学院土木工程系,澳大利亚维多利亚3800

出　　处：《中国科技论文》2017年第13期1508-1513,共6页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20133204120014);国家自然科学基金资助项目(51508278);江苏省自然科学基金资助项目(BK20140979)

摘　　要：通过自制仪器,对添加有不同含量粗粒材料的泥浆进行成膜闭气试验,分析泥浆中粗粒含量对泥膜闭气时间的影响,以揭示含粗粒材料泥膜的闭气机理并根据不同含量粗粒材料泥浆成膜效果和闭气性能的差异分析;研究粗粒材料、地层和泥浆颗粒形成的网架结构对泥膜闭气性的影响,以确定提高泥膜闭气性能的粗粒材料合理添加量。结果表明,添加的轻质砂能有效加快泥膜形成及增强泥膜的闭气性能,当泥浆中轻质砂添加量大于1.8g/L时,泥膜的闭气时间有较大的提升,但当添加量达到3g/L时,增加轻质砂添加量对泥膜闭气时间提升效果下降。In order to reveal the airproof mechanism of filter cake and evaluate the effects of coarse grain content on airproof time, a series of filter cake formation and airproof experiments were conducted on self-made instrument by employing slurries with dif-ferent contents of coarse grain materials. Coarse grain materials, soil grains and slurry particles can form network structure. Effects of the network structure can be obtained and the appropriate content of coarse grain materials can be determined based on the evaluation of filter cake formation and airproof capability with different contents of coarse grain materials. The results showed that light sand additives can accelerate the formation of filter cake and strengthen the airproof capability. In addition, airproof time greatly increased when employing specific slurry with 1. 8 g/L light sand. But once the additive content reached 3 g/L, the effect of increasing airtightness time for filter cake will be reduced with the additive content of light sand being increased.

关 键 词：盾构隧道 带压开舱 泥膜 闭气性 轻质砂 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]