砂卵石地层泥水盾构泥浆材料选择及配比优化分析
发布时间：2018-08-30 12:57
【摘要】：开挖面失稳破坏是泥水盾构施工主要的灾害之一。在砂卵石地层中进行泥水盾构掘进,由于地层渗透系数大、自稳能力差,会极大地提高开挖面失稳破坏的概率。确保开挖面稳定是泥水盾构中泥浆的两大主要功能之一,而泥浆稳定开挖面这一功能的实现取决于所用泥浆的类型、特性以及组成配比是否合理。为此本文采用理论分析、室内试验等研究手段,对砂卵石地层泥水盾构开挖面稳定机理、泥浆类型、泥浆材料特性、泥浆配比优化、泥浆与地层的适应能力以及泥浆特性对开挖面稳定性的影响等进行系统、深入的研究,取得以下研究成果： (1)将理论分析与室内试验相结合,初步划分了砂卵石地层泥水盾构的泥浆类型。对粘土聚合物泥浆、膨润土聚合物泥浆以及混合固相聚合物泥浆进行砂土悬浮能力试验,根据试验结果和对砂卵石地层的工程特性分析,确定了适合于砂卵石地层的泥水盾构泥浆类型为混合固相聚合物泥浆。 (2)基于泥浆材料特性试验,确定了砂卵石地层泥水盾构泥浆的固相颗粒材料(粘土与膨润土)的基本配比区间为4：5-3：2。 (3)采用试验方法分析制浆添加剂对泥浆特性的影响,得出了常用的六种制浆添加剂在不同含量条件下对泥浆主要特性的影响能力；对常见商品制浆添加剂进行优化改造,总结提出了8种具有良好制浆特性的改良型制浆剂；将理论分析与工程实例相结合,初步确定适合于砂卵石地层的泥浆特性指标参考值；以砂卵石地层泥浆特性指标参考值为依据,根据泥浆材料特性试验结论,优选出12组适合于砂卵石地层的泥水盾构泥浆配比。 (4)对不同特性的泥浆开展渗透试验,研究了泥浆的三大主要特性(泥浆粘度、泥浆比重和泥浆滤失量)对其渗透性能的影响。 (5)与工程实践相结合,分析提出了泥浆与地层适应性评价指标；进行室内试验,对比分析了北京地区砂卵石地层泥水盾构工地指定泥浆和试验优选泥浆的地层适应性；对不同的泥浆进行经济效益分析,综合得到6组具有良好的砂卵石地层适应性且满足经济实用要求的泥水盾构泥浆及其配比。 (6)基于砂卵石地层泥浆配比优化分析结果,提出了砂卵石地层泥水盾构泥浆特性指标建议值。
[Abstract]:Excavating surface instability is one of the main disasters in mud shield construction. Due to the large permeability coefficient and poor self-stability ability of mud-water shield tunneling in sand and pebble strata the probability of instability and failure of excavating surface will be greatly increased. To ensure the stability of dredging surface is one of the two main functions of mud in mud shield machine. The realization of this function depends on the type, characteristics and composition of the mud. Therefore, by means of theoretical analysis and laboratory test, this paper optimizes the stability mechanism, mud type, slurry material characteristics and mud mixture ratio of mud water shield tunneling in sand pebble formation. The adaptability of mud and formation and the influence of mud characteristics on the stability of excavating surface are systematically studied, and the following research results are obtained: (1) combining theoretical analysis with laboratory test, The mud types of mud water shield machine in sandy pebble formation are preliminarily divided. The suspension ability of clay polymer mud, bentonite polymer mud and mixed solid polymer mud were tested, and the engineering characteristics of sand pebble formation were analyzed according to the test results. The slurry type of mud water shield machine suitable for sand pebble formation is determined to be mixed solid phase polymer mud. (2) based on the characteristic test of mud material, The basic ratio interval of solid particle material (clay and bentonite) of mud water shield machine slurry in sand pebble formation is determined to be 4: 5-3: 2. (3) the influence of slurry additive on slurry properties is analyzed by means of test method. The influence ability of six kinds of commonly used additives on the main characteristics of slurry under different conditions was obtained, and the optimization and transformation of common commercial additives were carried out, and 8 kinds of improved pulping agents with good pulping characteristics were summarized and put forward. Combining theoretical analysis with engineering example, the reference value of mud characteristic index suitable for sand pebble formation is preliminarily determined, and based on the reference value of mud property index in sand pebble formation, according to the test conclusion of mud material characteristic, Twelve groups of mud water shield mud ratios suitable for sand pebble formation were selected. (4) the permeability tests of mud with different characteristics were carried out, and the three main characteristics of mud (mud viscosity, mud viscosity) were studied. The influence of mud specific gravity and mud filtration on its permeability. (5) combined with engineering practice, the adaptability evaluation index of mud and formation is analyzed and put forward. This paper compares and analyzes the formation adaptability of mud water shield machine site designated mud and test selected mud in Beijing sand pebble formation, and analyzes the economic benefit of different mud. Six groups of mud water shield drilling mud with good adaptability and economic and practical requirements were obtained. (6) based on the results of optimized analysis of mud ratio in sand pebble formation, The suggested value of mud slurry characteristic index of sand pebble formation mud shield machine is put forward.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43
本文编号：2213137
[Abstract]:Excavating surface instability is one of the main disasters in mud shield construction. Due to the large permeability coefficient and poor self-stability ability of mud-water shield tunneling in sand and pebble strata the probability of instability and failure of excavating surface will be greatly increased. To ensure the stability of dredging surface is one of the two main functions of mud in mud shield machine. The realization of this function depends on the type, characteristics and composition of the mud. Therefore, by means of theoretical analysis and laboratory test, this paper optimizes the stability mechanism, mud type, slurry material characteristics and mud mixture ratio of mud water shield tunneling in sand pebble formation. The adaptability of mud and formation and the influence of mud characteristics on the stability of excavating surface are systematically studied, and the following research results are obtained: (1) combining theoretical analysis with laboratory test, The mud types of mud water shield machine in sandy pebble formation are preliminarily divided. The suspension ability of clay polymer mud, bentonite polymer mud and mixed solid polymer mud were tested, and the engineering characteristics of sand pebble formation were analyzed according to the test results. The slurry type of mud water shield machine suitable for sand pebble formation is determined to be mixed solid phase polymer mud. (2) based on the characteristic test of mud material, The basic ratio interval of solid particle material (clay and bentonite) of mud water shield machine slurry in sand pebble formation is determined to be 4: 5-3: 2. (3) the influence of slurry additive on slurry properties is analyzed by means of test method. The influence ability of six kinds of commonly used additives on the main characteristics of slurry under different conditions was obtained, and the optimization and transformation of common commercial additives were carried out, and 8 kinds of improved pulping agents with good pulping characteristics were summarized and put forward. Combining theoretical analysis with engineering example, the reference value of mud characteristic index suitable for sand pebble formation is preliminarily determined, and based on the reference value of mud property index in sand pebble formation, according to the test conclusion of mud material characteristic, Twelve groups of mud water shield mud ratios suitable for sand pebble formation were selected. (4) the permeability tests of mud with different characteristics were carried out, and the three main characteristics of mud (mud viscosity, mud viscosity) were studied. The influence of mud specific gravity and mud filtration on its permeability. (5) combined with engineering practice, the adaptability evaluation index of mud and formation is analyzed and put forward. This paper compares and analyzes the formation adaptability of mud water shield machine site designated mud and test selected mud in Beijing sand pebble formation, and analyzes the economic benefit of different mud. Six groups of mud water shield drilling mud with good adaptability and economic and practical requirements were obtained. (6) based on the results of optimized analysis of mud ratio in sand pebble formation, The suggested value of mud slurry characteristic index of sand pebble formation mud shield machine is put forward.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43
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