【作者】 赵东杰；

【导师】 王贵和；

【作者基本信息】 中国地质大学(北京) ， 地质工程， 2012， 硕士

【摘要】 随着城市轨道交通建设的高速发展，地铁盾构施工以其独特的优势得到了广泛的应用。渣土改良技术作为土压平衡盾构的关键技术之一，在当今盾构的研究中日益受到重视。对盾构土体进行改良所用的改良剂主要为泡沫和泥浆两大类，各自都有其最适宜的地层。而针对于粒径较大的卵砾石地层，泥浆应用较为广泛，但施工现场所用泥浆纯膨润土泥浆，为了提高泥浆粘度，大多增大膨润土用量，这导致泥浆稠度系数过大，流动性差，重新开泵困难等不利因素，并且使泥浆造价升高。为改良现在泥浆在盾构应用中存在的缺陷，本文以北京地铁十号线为工程背景，利用理论分析、室内试验、现场试验等手段，针对砂卵石地层的工程特性，从稳定开挖面和渣土运输两方面入手，通过正交试验优选出了性能良好的泥浆配制方案，并通过现场试验中盾构参数的研究，确定了新型泥浆在工程现场的实用性。论文主要研究成果如下：⑴通过室内试验研究确定了对泥浆具有最佳改良性能的添加剂及其加入量；⑵通过正交试验对不同方案泥浆的性能进行综合分析，并得出具有最优性能的泥浆配制方案；⑶通过室内模拟实验，对工地用泥浆和新型泥浆在卵石/圆砾和砂土中应用时改良效果进行对比分析，评价新型泥浆的改良效果；⑷通过现场试验，分析新型泥浆在盾构现场应用时的盾构参数，并与工地用泥浆进行对比，确定其现场实用性。本课题理论与试验相结合，室内模拟试验和施工现场试验相结合，确定了新型泥浆配制方案和其实用性，并对其造价与工地泥浆进行比较，对以后新型泥浆的研究具有一定指导意义。更多还原

【Abstract】 With the rapid development of city track traffic construction，EPBS(EarthPressure Balanced Shield tunneling) is widely used by its unique advantages.Muck conditioning technology in EPBS, which is one of the key technology, hasbeen paid more and more attention. There are two kinds of muck conditioningagents, one is foam and the other one is slurry, and each have their own mostappropriate layer. But in the larger particle size of gravel stratum, slurry is widelyused. But what is used in construction site is pure betonies slurry. In order toimprove the viscosity of slurries, most increase the dosage of betonies, which led theslurry consistency coefficient is too large, reopen pump becoming difficult,increasing the slurry cost and so on. In order to improve these defects, with theBeijing subway line ten backgrounds, this paper through theoretical analysis,laboratory tests and field test methods, according to the engineering characteristicsof sand and gravel stratum, optimized the best slurry preparation program byorthogonal test. And through the field test research on shield parameters, determinedthe useful of new slurry in EPBS. The main research results of this paper is asfollows:(1) Optimized the best additive which has the best Improve performance toslurry by indoor test and determined it’s optimum adding amount;(2) Optimized the best slurry preparation program by orthogonal test ondifferent scheme of comprehensive performance analysis of slurry;(3) Evaluation of novel slurry amelioration effects through comparison andanalysis of the two kinds of slurry ‘s improvement effects in pebble/round gravel and sand by Indoor simulation test;(4) Determined the new slurry’s practical application through analysising ofshield parameters when it is used in EPBS and comparing with the commonslurry by field test.By Combining the theory with practice, indoor simulation experiment and fieldtest, this topic determined a novel slurry preparation plan and practicality. And make a cost comparison with site slurry. It may have certain guiding significance to thelater new slurry research.更多还原