本文關(guān)鍵詞： 砂卵石地層 土壓平衡式盾構(gòu) 渣土改良 水下隧道　出處：《南昌工程學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著城市高速的發(fā)展,我國各大中城市地鐵建設(shè)進(jìn)入高峰期,盾構(gòu)法施工因機(jī)械化程度高、勞動(dòng)強(qiáng)度低、安全性高、對周邊環(huán)境影響小等特點(diǎn)而被廣泛采用,成為地鐵建設(shè)領(lǐng)域的主要施工方法之一,在廣泛應(yīng)用的同時(shí),也常因渣土改良不當(dāng)或失效而導(dǎo)致施工停頓,施工成本增加,甚者引發(fā)安全事故。為有效的避免上述問題發(fā)生,本文研究以南昌地區(qū)首個(gè)盾構(gòu)法水下區(qū)間隧道艾溪湖東站~艾溪湖西站地鐵區(qū)間為依托,針對在全斷面砂卵石、砂礫石地層掘進(jìn)中出現(xiàn)的“泥餅”、“噴涌”、閉塞、磨損等技術(shù)難題開展研究。研究從現(xiàn)場實(shí)際問題出發(fā),采用正交試驗(yàn)設(shè)計(jì)法開展室內(nèi)試驗(yàn)研究,輔以現(xiàn)場實(shí)踐驗(yàn)證。系統(tǒng)研究了不同渣土改良材料的微觀作用機(jī)理及其對地層的適應(yīng)性,并采用滲透系數(shù)、摩擦系數(shù)、坍落度等指標(biāo)評價(jià)改良土體的流動(dòng)性、粘聚性及保水性,使得渣土改良后呈類似于牙膏狀的“流塑狀態(tài)”,根據(jù)室內(nèi)試驗(yàn)結(jié)果確定在砂卵石、砂礫石地層中的最佳改良方案�，F(xiàn)場實(shí)踐驗(yàn)證采用試掘進(jìn)的方式驗(yàn)證渣土改良效果,重點(diǎn)分析主要掘進(jìn)參數(shù)及周邊環(huán)境變化情況,分析研究在改良方案調(diào)整前后的盾構(gòu)推力、掘進(jìn)速度、刀盤扭矩、螺旋機(jī)轉(zhuǎn)速、扭矩及現(xiàn)場監(jiān)測數(shù)據(jù)的變化情況。現(xiàn)場實(shí)踐數(shù)據(jù)表明,本文提出的渣土改良方案解決了艾東~艾西盾構(gòu)區(qū)間在施工過程中遇到的一些技術(shù)難題,取得了很好的改良效果,降低了盾構(gòu)長距離穿越湖泊的風(fēng)險(xiǎn),減少了盾體及刀具的磨損,節(jié)約了掘進(jìn)成本,安全有序的保證了項(xiàng)目的順利實(shí)施,為后續(xù)類似工程提供借鑒經(jīng)驗(yàn)。
[Abstract]:With the rapid development of cities, subway construction in large and medium-sized cities in China has entered the peak period. The shield method has been widely used because of its high degree of mechanization, low labor intensity, high security and little impact on the surrounding environment. As one of the main construction methods in the field of subway construction, when it is widely used, it often leads to construction stoppage due to improper or invalid improvement of residual soil, increases construction cost, and even leads to safety accidents. In order to effectively avoid the above problems, Based on the first shield method underwater section tunnel in Nanchang area, the subway section of Exi Lake East Station to Exi Lake West Station, the "mud cake", "gushing" and "blocking" appearing in the full-section sand pebble and gravel excavation are studied in this paper. Research on the technical problems such as wear and tear. Based on the actual problems in the field, the orthogonal test design method is used to carry out the indoor test research. The microcosmic action mechanism and its adaptability to the formation of different residual soil improvement materials are systematically studied, and the fluidity, cohesion and water retention of the improved soil are evaluated by using the permeability coefficient, friction coefficient and slump, etc. The "fluid-plastic state" of residual soil is similar to that of toothpaste after improvement. According to the results of laboratory tests, the best improvement scheme in sand pebble and gravel stratum is determined. Field practice proves that the method of test excavation is used to verify the effect of residue soil improvement. Emphasis is placed on the analysis of the main tunneling parameters and the changes in the surrounding environment, and the analysis and study of the shield thrust, tunneling speed, cutter head torque, rotating speed of the spiral machine before and after the adjustment of the improved scheme, The change of torque and field monitoring data shows that the residual soil improvement scheme proposed in this paper has solved some technical problems encountered in the construction process of the Aidong-Essy shield section, and achieved a good improvement effect. It can reduce the risk of shield tunneling through lake, reduce the wear of shield body and tool, save the cost of tunneling, ensure the smooth implementation of the project safely and orderly, and provide reference experience for the following similar projects.
【學(xué)位授予單位】：南昌工程學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.43;U231.3

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