TBM滚刀不同切削顺序下破岩特性及优化布置研究
发布时间：2019-04-19 05:07
【摘要】：摘要：进入21世纪以来,硬岩隧道掘进机(TBM)在国民生活建设中运用得越来越广泛,盘形滚刀作为TBM主要开挖工具,其与岩石作用机理的研究是提高滚刀破岩效率和加快TBM国产化进程的关键。论文在查阅大量国内外文献的基础上,依据现有滚刀布置特点,对滚刀不同切削顺序下破岩阻力和岩石破碎特征进行分析,并对滚刀布置进行优化,主要研究内容如下： (1)利用ANSYS/LS-DYNA软件建立了不同滚刀切削顺序数值仿真模型,研究了不同切削顺序下,地质条件、刀间距、贯入度、安装极径及刀盘转速对滚刀破岩阻力的影响规律,通过正交试验综合分析了各因素对滚刀破岩阻力影响显著性,并通过实验研究验证了数值模拟的正确性。 (2)基于PFC仿真软件建立了不同滚刀切削顺序下岩石破碎离散元数值模型,分析不同切削顺序下滚刀侵入岩石裂纹扩展规律与破碎面积特征,总结并得到了三种滚刀破岩模式,分析了刀间距和贯入度对破岩模式的影响。 (3)分析滚刀破岩刀盘受力状况,确定了滚刀优化布置目标函数和约束条件,并利用模糊层次分析法计算目标函数权重,在此基础上建立了滚刀多目标优化布置模型,采用遗传算法对模型进行求解得到了滚刀最优布置参数,优化后刀盘性能获得较大改善。
[Abstract]:Abstract: since the beginning of the 21st century, hard rock tunnel boring machine (TBM) has been used more and more widely in the construction of national life. Disc hob is the main excavating tool of TBM. The research of its interaction mechanism with rock is the key to improve the efficiency of rock breaking with hob and accelerate the process of TBM localization. On the basis of consulting a large number of domestic and foreign literatures, according to the characteristics of existing hob arrangement, the rock breaking resistance and rock breaking characteristics under different cutting sequence of hob are analyzed, and the layout of hob is optimized. The main contents are as follows: (1) the numerical simulation models of different hob cutting sequence are established by using ANSYS/LS-DYNA software, and the geological conditions, tool spacing and penetration degree under different cutting sequence are studied. The influence of installing pole diameter and rotating speed of cutter head on rock breaking resistance of hob is analyzed by orthogonal experiment, and the correctness of numerical simulation is verified by experimental research. (2) based on PFC simulation software, the discrete element numerical model of rock fracture under different cutting order is established, and the crack propagation law and fracture area characteristics of hobs invading into rock under different cutting sequence are analyzed. Three kinds of rock breaking modes of hob are summarized and obtained, and the influence of tool spacing and penetration on rock breaking mode is analyzed. (3) analyzing the force condition of hob broken cutter disc, determining the objective function and constraint condition of hob optimal layout, calculating the weight of objective function by fuzzy analytic hierarchy process, and establishing the multi-objective optimal layout model of hob, on the basis of which, the multi-objective optimal layout model of hob is established. Genetic algorithm is used to solve the model and the optimal parameters of hob placement are obtained, and the performance of the cutter head is greatly improved after optimization.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.31
本文编号：2460625
[Abstract]:Abstract: since the beginning of the 21st century, hard rock tunnel boring machine (TBM) has been used more and more widely in the construction of national life. Disc hob is the main excavating tool of TBM. The research of its interaction mechanism with rock is the key to improve the efficiency of rock breaking with hob and accelerate the process of TBM localization. On the basis of consulting a large number of domestic and foreign literatures, according to the characteristics of existing hob arrangement, the rock breaking resistance and rock breaking characteristics under different cutting sequence of hob are analyzed, and the layout of hob is optimized. The main contents are as follows: (1) the numerical simulation models of different hob cutting sequence are established by using ANSYS/LS-DYNA software, and the geological conditions, tool spacing and penetration degree under different cutting sequence are studied. The influence of installing pole diameter and rotating speed of cutter head on rock breaking resistance of hob is analyzed by orthogonal experiment, and the correctness of numerical simulation is verified by experimental research. (2) based on PFC simulation software, the discrete element numerical model of rock fracture under different cutting order is established, and the crack propagation law and fracture area characteristics of hobs invading into rock under different cutting sequence are analyzed. Three kinds of rock breaking modes of hob are summarized and obtained, and the influence of tool spacing and penetration on rock breaking mode is analyzed. (3) analyzing the force condition of hob broken cutter disc, determining the objective function and constraint condition of hob optimal layout, calculating the weight of objective function by fuzzy analytic hierarchy process, and establishing the multi-objective optimal layout model of hob, on the basis of which, the multi-objective optimal layout model of hob is established. Genetic algorithm is used to solve the model and the optimal parameters of hob placement are obtained, and the performance of the cutter head is greatly improved after optimization.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.31
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