基于回转切削的TBM滚刀载荷预测及其布置方法研究
发布时间：2018-09-08 12:43
【摘要】：地下空间的开发利用已成为解决交通,水利和排污的重要途径。对于硬岩隧洞开挖建设,TBM(Tunnel boring machine)以其高安全性、高效率和低成本的特点得到广泛应用。刀盘作为TBM的核心部件之一,其性能影响着整机的性能。针对滚刀等磨损、高效破岩和分区域滚刀布置等性能要求,基于回转切削有限元方法和理论分析,深入研究了滚刀安装布置参数、掘进参数对滚刀载荷和掘进性能影响,开展了刀具布局研究。针对滚刀运动形式建立了滚刀回转切削模型,在此基础上,研究了不同安装半径上滚刀载荷变化情况,研究表明:滚刀的垂直力和滚动力的大小与安装半径关系不大,侧向力的大小随安装半径变小而变大。而针对滚刀切削后的沟槽为后续滚刀切削提供的临空面,分析了临空面对破岩机理的影响,并对分析结果进行了验证,研究表明:滚刀距离临空面越近,所承受的载荷越小,岩石的等效塑性应变呈偏态分布,偏向于临空面。在基础上,分析研究了内外侧滚刀的切削顺序对滚刀载荷的影响,研究表明:相对于先切削的滚刀,后切削滚刀载荷较小。TBM操作参数(滚刀贯入量和刀盘转速)对滚刀载荷的影响也进行了相关研究,研究表明:当刀盘转速增大时,滚刀的垂直力和滚动力相应变大;滚刀切削系数与贯入量呈线性关系,滚刀载荷随贯入量增加而增加。基于切削比能最小原则,提出TBM操作参数优化组合方法:大贯入量低转速,小贯入量高转速。最后,在研究成果的基础上,分析了中心滚刀呈“一”字布置的合理性,并提出了中心滚刀安装角度的改进方法:滚刀前端向刀盘中心旋转一定的角度,且越靠近刀盘中心的滚刀的旋转角度越大。结合正滚刀布置约束条件,考虑滚刀等磨损原则,提出了内侧滚刀超前外侧滚刀的正滚刀布置方法。建立边缘滚刀破岩的三维模型,研究了边缘滚刀的破岩机理,研究表明:边缘岩石的能量更多用于产生两侧裂纹;当相邻滚刀的刀间距过大时,切削后相邻滚刀间仍存在岩脊,针对边缘滚刀的布置情况,提出了边缘滚刀刀间距的设计方法:以边缘滚刀刀尖-刀尖之间的距离代替投影面上测得的距离作为边缘滚刀刀间距。
[Abstract]:The development and utilization of underground space has become an important way to solve traffic, water conservancy and sewage. For hard rock tunnel excavation and construction, TBM (Tunnel boring machine) is widely used because of its high safety, high efficiency and low cost. As one of the core components of TBM, the performance of cutter head affects the performance of the whole machine. Aiming at the performance requirements of hob wear, high efficiency rock breaking and regional hob arrangement, based on the finite element method and theoretical analysis of rotary cutting, the installation and layout parameters of hob and the influence of tunneling parameters on hob load and tunneling performance are studied in depth. Research on tool layout is carried out. The rotary cutting model of hob is established according to the motion form of hob. On the basis of this, the change of hob load on different installation radius is studied. The research shows that the vertical force and rolling force of hob have little relation with installation radius. The magnitude of the lateral force increases with the size of the installation radius. Aiming at the empty surface provided by the grooves after hob cutting for the subsequent hob cutting, the influence of the rock breaking mechanism on the face of the hob is analyzed, and the analysis results are verified. The research shows that the closer the hob is to the empty surface, the smaller the load is. The equivalent plastic strain of rock is skewed and inclined to face the void. On the basis of this, the influence of the cutting order of the inner and outer side hobs on the hob load is analyzed and studied. The results show that: compared with the first cutting hob, The influence of the operation parameters (hob penetration and cutter speed) on the hob load is also studied. The results show that the vertical force and the rolling force of the hob become larger when the rotating speed of the cutter increases. The cutting coefficient of hob is linearly related to the penetration, and the hob load increases with the increase of penetration. Based on the principle of minimum cutting specific energy, an optimal combination method of TBM operating parameters is proposed: large penetration with low speed and small penetration with high speed. Finally, on the basis of the research results, the rationality of the "one" word arrangement of the center hob is analyzed, and the improvement method of the installation angle of the center hob is put forward: the hob front end rotates a certain angle to the center of the cutter head, The greater the rotation angle of the hob near the center of the cutter head. According to the constraint condition of normal hob arrangement and considering the wear principle of hob, this paper puts forward the method of hob arrangement for inner hob advance outside hob. A 3D model of edge hob breaking rock is established, and the rock breaking mechanism of edge hob is studied. The results show that the energy of edge rock is more used to produce cracks on both sides, and when the tool spacing of adjacent hob is too large, there are still rock ridges between adjacent hobs after cutting. According to the arrangement of edge hob, the design method of edge hob distance is put forward: the distance between edge hob and edge hob is used as the distance between edge hob and edge hob instead of the distance measured on projection plane.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.3
本文编号：2230559
[Abstract]:The development and utilization of underground space has become an important way to solve traffic, water conservancy and sewage. For hard rock tunnel excavation and construction, TBM (Tunnel boring machine) is widely used because of its high safety, high efficiency and low cost. As one of the core components of TBM, the performance of cutter head affects the performance of the whole machine. Aiming at the performance requirements of hob wear, high efficiency rock breaking and regional hob arrangement, based on the finite element method and theoretical analysis of rotary cutting, the installation and layout parameters of hob and the influence of tunneling parameters on hob load and tunneling performance are studied in depth. Research on tool layout is carried out. The rotary cutting model of hob is established according to the motion form of hob. On the basis of this, the change of hob load on different installation radius is studied. The research shows that the vertical force and rolling force of hob have little relation with installation radius. The magnitude of the lateral force increases with the size of the installation radius. Aiming at the empty surface provided by the grooves after hob cutting for the subsequent hob cutting, the influence of the rock breaking mechanism on the face of the hob is analyzed, and the analysis results are verified. The research shows that the closer the hob is to the empty surface, the smaller the load is. The equivalent plastic strain of rock is skewed and inclined to face the void. On the basis of this, the influence of the cutting order of the inner and outer side hobs on the hob load is analyzed and studied. The results show that: compared with the first cutting hob, The influence of the operation parameters (hob penetration and cutter speed) on the hob load is also studied. The results show that the vertical force and the rolling force of the hob become larger when the rotating speed of the cutter increases. The cutting coefficient of hob is linearly related to the penetration, and the hob load increases with the increase of penetration. Based on the principle of minimum cutting specific energy, an optimal combination method of TBM operating parameters is proposed: large penetration with low speed and small penetration with high speed. Finally, on the basis of the research results, the rationality of the "one" word arrangement of the center hob is analyzed, and the improvement method of the installation angle of the center hob is put forward: the hob front end rotates a certain angle to the center of the cutter head, The greater the rotation angle of the hob near the center of the cutter head. According to the constraint condition of normal hob arrangement and considering the wear principle of hob, this paper puts forward the method of hob arrangement for inner hob advance outside hob. A 3D model of edge hob breaking rock is established, and the rock breaking mechanism of edge hob is studied. The results show that the energy of edge rock is more used to produce cracks on both sides, and when the tool spacing of adjacent hob is too large, there are still rock ridges between adjacent hobs after cutting. According to the arrangement of edge hob, the design method of edge hob distance is put forward: the distance between edge hob and edge hob is used as the distance between edge hob and edge hob instead of the distance measured on projection plane.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.3
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