复杂地层盾构刀具磨损控制技术研究

发布时间：2018-09-19 17:07

【摘要】：摘要：复杂地层土压平衡盾构长距离掘进一直是国内外的难题。在这种地层施工,盾构刀具磨耗严重,容易破损、脱落。掘进中一旦出现这类情况,将导致刀盘扭矩上升,盾构推进困难,甚至无法施工,被迫开舱换刀。因此,研究如何减少复杂地层中刀具磨损是盾构掘进技术的重点难点。本文在详细调研国内外相关理论研究成果和工程实例的基础上,以北京地下铁路直径线和某地铁一号线为工程背景,利用现场量测、理论分析及数值模拟等手段从机械与土壤两方面入手,对复杂地层条件下土压平衡盾构掘进刀具磨损的问题进行了研究,取得了下列研究成果： (1)系统分析了各种刀具的工作原理,及其磨损原因和影响因素。研究了刀盘、刀具形式及刀具的排列布置与各种土层的适用关系。在此基础上得出了适应砂卵石地层及硬岩地层的土压平衡盾构应选择的刀盘形式及刀具布置方式。 (2)通过对砂卵石地层中的滚刀磨损分析,提出了减小刀具磨损的相应措施。并对刀盘磨损损伤规律进行了深入分析,评价了改造后刀具配置方案的效果。通过大量的现场监测数据进行严密的统计、分析计算,并结合施工实践,得出适应于砂卵石地层盾构掘进的参数设置以及刀具的几何参数。 (3)通过在硬岩地层中刀具磨损进行量测以及掘进数据分析,得出掘进参数刀具磨损的相互关系。并根据实际掘进情况,提出了刀盘刀具的改进方案,并根据新的刀盘刀具配置,给出了相应的施工掘进参数作为参考以及掘进过程中相应的刀具处理措施。 (4)通过PFC2D离散元软件,建立了盾构先行刀和刮刀刀具组合与前方土体相互作用的数值模型,模拟分析了先行刀侵入前方土体后刮刀刮出耕松部分的过程。通过不同高差,不同间距配比,得出在无水砂卵石地层中,地层适应率较好的刀具配置形式。
[Abstract]:Abstract: long-distance tunneling of earth pressure balance shield in complex strata has always been a difficult problem at home and abroad. In this formation construction, shield cutting tool wear, easy to damage, shedding. Once this happens in tunneling, the torque of the cutter head will rise, the shield driving is difficult, even can not be constructed, forced to open the tank to change the knife. Therefore, how to reduce tool wear in complex strata is the key point of shield tunneling technology. On the basis of detailed investigation of relevant theoretical research results and engineering examples at home and abroad, this paper takes the diameter line of Beijing underground railway and a subway line 1 as the engineering background and makes use of the field measurement. By means of theoretical analysis and numerical simulation, the wear of shield tunneling tool under the condition of complex stratum is studied from two aspects: mechanical and soil. The main results are as follows: (1) the working principle, wear reasons and influencing factors of various cutters are systematically analyzed. The relationship between cutter head, tool form and arrangement of cutting tool and various soil layers is studied. On the basis of this, the cutting head form and tool arrangement mode of earth pressure balance shield machine suitable for sand pebble formation and hard rock stratum are obtained. (2) through the analysis of hob wear in sand pebble formation, The corresponding measures to reduce tool wear are put forward. The wear damage law of cutter head is analyzed, and the effect of tool configuration after modification is evaluated. Through a large number of on-site monitoring data for rigorous statistics, analysis and calculation, and combined with construction practice, The parameters of shield tunneling and the geometric parameters of cutting tools are obtained. (3) through the measurement of tool wear in hard rock strata and the analysis of tunneling data, the relationship between tool wear and tool wear is obtained. According to the actual driving situation, the improvement scheme of cutter head tool is put forward, and according to the new tool configuration of cutter head, The corresponding construction tunneling parameters are given as the reference and the corresponding cutting tool treatment measures in the tunneling process are given. (4) through the PFC2D discrete element software, A numerical model of the interaction between the advance cutter and the scraper tool combination of shield machine and the soil in front is established, and the process of scraping out the loose part of the soil after the advance knife invades the soil is simulated and analyzed. According to the difference of height and the ratio of different spacing, the tool configuration with better formation adaptability is obtained in the dry sand and pebble formation.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU94

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