【摘要】：開挖面失穩(wěn)破壞是泥水盾構(gòu)施工主要的災(zāi)害之一。在砂卵石地層中進(jìn)行泥水盾構(gòu)掘進(jìn),由于地層滲透系數(shù)大、自穩(wěn)能力差,會(huì)極大地提高開挖面失穩(wěn)破壞的概率。確保開挖面穩(wěn)定是泥水盾構(gòu)中泥漿的兩大主要功能之一,而泥漿穩(wěn)定開挖面這一功能的實(shí)現(xiàn)取決于所用泥漿的類型、特性以及組成配比是否合理。為此本文采用理論分析、室內(nèi)試驗(yàn)等研究手段,對(duì)砂卵石地層泥水盾構(gòu)開挖面穩(wěn)定機(jī)理、泥漿類型、泥漿材料特性、泥漿配比優(yōu)化、泥漿與地層的適應(yīng)能力以及泥漿特性對(duì)開挖面穩(wěn)定性的影響等進(jìn)行系統(tǒng)、深入的研究,取得以下研究成果： (1)將理論分析與室內(nèi)試驗(yàn)相結(jié)合,初步劃分了砂卵石地層泥水盾構(gòu)的泥漿類型。對(duì)粘土聚合物泥漿、膨潤土聚合物泥漿以及混合固相聚合物泥漿進(jìn)行砂土懸浮能力試驗(yàn),根據(jù)試驗(yàn)結(jié)果和對(duì)砂卵石地層的工程特性分析,確定了適合于砂卵石地層的泥水盾構(gòu)泥漿類型為混合固相聚合物泥漿。 (2)基于泥漿材料特性試驗(yàn),確定了砂卵石地層泥水盾構(gòu)泥漿的固相顆粒材料(粘土與膨潤土)的基本配比區(qū)間為4：5-3：2。 (3)采用試驗(yàn)方法分析制漿添加劑對(duì)泥漿特性的影響,得出了常用的六種制漿添加劑在不同含量條件下對(duì)泥漿主要特性的影響能力；對(duì)常見商品制漿添加劑進(jìn)行優(yōu)化改造,總結(jié)提出了8種具有良好制漿特性的改良型制漿劑；將理論分析與工程實(shí)例相結(jié)合,初步確定適合于砂卵石地層的泥漿特性指標(biāo)參考值；以砂卵石地層泥漿特性指標(biāo)參考值為依據(jù),根據(jù)泥漿材料特性試驗(yàn)結(jié)論,優(yōu)選出12組適合于砂卵石地層的泥水盾構(gòu)泥漿配比。 (4)對(duì)不同特性的泥漿開展?jié)B透試驗(yàn),研究了泥漿的三大主要特性(泥漿粘度、泥漿比重和泥漿濾失量)對(duì)其滲透性能的影響。 (5)與工程實(shí)踐相結(jié)合,分析提出了泥漿與地層適應(yīng)性評(píng)價(jià)指標(biāo)；進(jìn)行室內(nèi)試驗(yàn),對(duì)比分析了北京地區(qū)砂卵石地層泥水盾構(gòu)工地指定泥漿和試驗(yàn)優(yōu)選泥漿的地層適應(yīng)性；對(duì)不同的泥漿進(jìn)行經(jīng)濟(jì)效益分析,綜合得到6組具有良好的砂卵石地層適應(yīng)性且滿足經(jīng)濟(jì)實(shí)用要求的泥水盾構(gòu)泥漿及其配比。 (6)基于砂卵石地層泥漿配比優(yōu)化分析結(jié)果,提出了砂卵石地層泥水盾構(gòu)泥漿特性指標(biāo)建議值。
[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.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.43

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