砂卵石地层盾构刀盘刀具切削仿真分析

发布时间：2018-07-05 19:20

本文选题：砂卵石地层 + 刀盘刀具　；参考：《大连交通大学》2014年硕士论文

【摘要】：随着我国隧道及地下空间的发展,盾构施工技术也得到了广泛应用。然而目前尚未形成完善的盾构机设计理论。盾构机在砂卵石地层掘进时,刀盘刀具受力复杂,磨损严重,地层容易坍塌。为了掌握盾构机在砂卵石地层掘进时刀盘刀具受力情况,优化刀盘设计,提高盾构刀盘的地质适应性和掘进效率,本文在国家自然科学基金“盾构刀盘与岩土动态交互作用机理及刀盘系统设计理论(51105048)”资助下,完成主要工作如下： 1.通过调研,研究了近几十年来国内外在砂卵石地层掘进的盾构施工技术以及刀具切削土体的研究现状及研究重点,分析了砂卵石地层特点和我国砂卵石地层盾构施工实例,研究适合砂卵石地层的刀盘结构形式、刀具和刀具配置,在此基础上,根据施工经验总结施工时常出现的问题及解决办法。 2.利用三维建模软件Pro/E建立某一盾构刀盘刀具的三维实体模型,用ANSYS建立有限元模型,计算出各刀具的切削力,分别对盾构刀盘刀具在砂卵石地层不同推进工况下的受力进行静态有限元分析,得出应力、应变分布,并研究提出提高刀盘刀具耐用性的措施。 3.运用动力学分析软件ANSYS/LS-DYNA建立砂卵石地层刀具切削土体的三维有限元模型,选取适合土壤切削的土体本构模型,对刀具切削进行动态仿真。研究切削刀具在不同切削速度、切削深度和刀间距的情况下,刀具与土体接触过程中的力学变化规律,仿真结果得出：随着切削深度的增加刀具接触力增大,切削速度对刀具接触力的影响不大,随着刀间距的增加,刀具接触力有增大趋势,但增加量较小。双刀协同切削时刀具接触力比同掘进参数下单刀切削时的接触力明显降低。研究结果为砂卵石地层刀盘刀具布局设计及合理掘进参数的选择提供参考。
[Abstract]:With the development of tunnel and underground space in China, shield construction technology has been widely used. However, no perfect shield machine design theory has been formed at present. When the shield machine is driving in the sand and pebble stratum, the cutter tool has complex force and serious wear, and the stratum collapses easily. In order to understand the force of cutter in sand and pebble stratum, optimize the design of cutter head, improve the geological adaptability and tunneling efficiency of shield cutter head. Supported by the National Natural Science Foundation of China, the mechanism of dynamic interaction between shield cutter head and rock and soil and the design theory of cutter head system (51105048), the main work is as follows: 1. Through investigation and investigation, this paper studies the technology of shield tunneling in sand and gravel strata in recent decades and the research status and emphases of cutting soil by cutting tools, and analyses the characteristics of sand and gravel strata and the examples of shield construction in sand and gravel strata in China. This paper studies the structural form of cutter head, tool and tool configuration suitable for sand and pebble stratum. On the basis of this, the problems that often appear in construction are summarized according to the construction experience and the solutions are given. 2. The 3D solid model of a shield cutter is established by using the 3D modeling software Prop / E, and the finite element model is established by ANSYS to calculate the cutting force of each tool. The static finite element analysis of the cutting tool of shield machine under different propulsion conditions of sand pebble stratum is carried out, the distribution of stress and strain is obtained, and the measures to improve the durability of cutter head tool are put forward. The dynamic analysis software ANSYS- LS-DYNA was used to establish a three-dimensional finite element model for cutting soil by cutting tools in sand and gravel strata. The constitutive model of soil was selected for soil cutting, and the dynamic simulation of cutting tool was carried out. The mechanical changes of cutting tools in the process of contact with soil are studied under the conditions of different cutting speed, cutting depth and tool spacing. The simulation results show that the contact force increases with the increase of cutting depth. The cutting speed has little effect on the tool contact force. With the increase of tool spacing, the tool contact force increases, but the increase is small. The contact force of the cutting tool is lower than that of the single cutter cutting with the same tunneling parameters. The results provide a reference for the tool layout design and the selection of reasonable tunneling parameters.
【学位授予单位】：大连交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.39

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