【摘 要】
：
This paper describes the influence of joint spacing and joint orientation on the penetration rate of a Tunnel Boring Machine (TBM) disc cutter as modeled by the
【机 构】
：
Faculty of Mining. Petroleum and Geophysics Engineering. Shahrood University of Technology
论文部分内容阅读
This paper describes the influence of joint spacing and joint orientation on the penetration rate of a Tunnel Boring Machine (TBM) disc cutter as modeled by the Discrete Element Method (DEM).The input data for the simulations were obtained from the sandstone along the Alborz tunnel that is currently being excavated in Iran using a 5.2 m diameter open TBM.Three joint spacings,150,200,and 300 mm,were modeled together with seven values of joint orientation; 0°,15°,30°,45°,60°,75°,and 90°.The results show that the penetration increases when joint orientation increases from 0° to 75°,but it decreases as the joint orientation increases further from 75° to 90°.This is true for each joint spacing.In addition,for a given joint orientation increasing the joint spacing causes the TBM penetration to decrease.The optimum joint orientation,from the viewpoint of TBM penetration,is about 60-75°.
其他文献
新的形势任务,要求领导干部把读书学习作为推进党的事业发展、提升强军本领、加强党性锤炼的一项政治任务,并做到真学、恒学、精学和实学。
The new situation and tasks re
由于FRP材料具有高强、轻质、耐腐蚀等优点,在混凝土结构中用FRP筋代替钢筋的方法常在一些工程中采用。过去的研究工作大多集中在FRP筋简支梁上,但实际工程中,多数是连续梁。
The existing research of the active suspension system(ASS) mainly focuses on the different evaluation indexes and control strategies. Among the different compon
In this paper, a climate-adaptation study of vernacular houses in northern Hebei Province has been conducted based on quantitative field surveys. Three typical
Studies on the mechanical properties and microstructures of as-cast and extruded Mg-Ce-Zn-Zr and Mg-Nd-Zn-Zr alloys have been made before and after heat treatme
介绍了上海世博会概况,进行了上海世博会园区交通区位及客流特点分析,给出了上海世博会园区客流集散枢纽的定义和选址原则、评价指标体系及客流集散枢纽方案,用层次分析法
Overturning is one of principal failure types of caisson breakwaters and is an essential content of stability examination in caisson breakwater design. The mass
研究两条道路交通系统中收费下降对系统交通需求和交通成本的影响.在对成本和需求进行动态分析的基础上,建立了系统交通成本的演化方程组,推导出边际需求对交通流速度的约
Compressive properties of composite laminates after low velocity impact are one of the most serious circumstances that must be taken into account in damage tole
Linear singular vector and linear singular value can only describe the evolution of sufficiently small perturbations during the period in which the tangent line