岩土工程学报2013，Vol.35Issue(2)：235-242,8.
盾构切刀作用下岩石动态响应机制的数值模拟研究
Numerical simulation of dynamic response mechanism of rock by shield machine cutters
摘要
Abstract
In order to study the dynamic response mechanism of the rock fragmentation and its influential factors, from meso-level structure of rock, a numerical model for the rock and shield machine cutters is proposed based on the particle flow code (PFC2D). The results show that the rock fragmentation process is composed of the cycle of various-small shearings and one large shearing, which causes the cutting force to fluctuate continuously. As the cutter distance increases, the cutting force and rock cracks increase. It shows that the formation of the cracks needs greater forces. From the cutting performance aspect, the positive rake angle of the cutter produces higher cutting efficiency than the negative one. The cutting forces and crack numbers data are statistically analyzed, and the results show that the effect of the cutting depth is greater than the cutting speed.关键词
盾构/切刀/破岩/颗粒离散元/数值模拟Key words
shield machine/ cutter/ rock fragmentation/ particle flow code/ numerical simulation分类
信息技术与安全科学引用本文复制引用
谭青,徐孜军,夏毅敏,李建芳,朱逸,刘川..盾构切刀作用下岩石动态响应机制的数值模拟研究[J].岩土工程学报,2013,35(2):235-242,8.基金项目
国家自然科学基金项目(51074180,51274252) （51074180,51274252）
中国博士后科学基金特别资助项目(201003519) （201003519）
湖南省科技重大专项项目(2010FJ1002) （2010FJ1002）
湖南省科技支撑计划项目(2010GK3073) （2010GK3073）
