Influence of rock brittleness on TBM penetration rate in Singapore granite
Influence of rock brittleness on TBM penetration rate in Singapore granite
复制标题
DOI：
10.1016/j.tust.2006.07.004
复制
发表时间：
2007-05-01
影响因子：
6.9
通讯作者：
Zhao, J.
中科院分区：
文献类型：
--
作者：
Gong, Q. M.;Zhao, J.
脆性是岩石的重要性质之一，它影响着TBM刀具破碎岩石的过程，进而影响着TBM的掘进速度。本文介绍了岩石脆性的各种测量方法。采用单轴抗压强度与巴西抗拉强度的比值来量化岩石的脆性。通过室内试验，获得了新加坡DTSS T05和T06隧道走向沿着武吉知麻花岗岩中取芯的100多个试样的脆性指标。脆性指数在小于10至大于25的大范围内变化。结果表明，花岗岩的脆性指数随风化程度的增加而减小。建立了一系列模型，利用离散元法模拟了岩石脆性对岩石破碎过程的影响。随着脆性指数的减小，破碎区减小，破碎区外的主裂纹数量和长度也减小。结果表明，随着岩石脆性指数的增大，刀具压入过程变得更加容易。通过统计分析隧道工程中岩体性质与相应的TBM性能之间的相关性，发现随着岩体脆性的增加，TBM的掘进速度也随之增加，这与数值模拟结果相一致。(c)2006爱思唯尔有限公司保留所有权利。
Brittleness is one of the most important rock properties, which affects the rock fragmentation process induced by TBM cutters, and then the TBM penetration rate. This paper presents the different measurements of rock brittleness. The ratio of uniaxial compressive strength to Brazilian tensile strength was adopted to quantify the rock brittleness. By the laboratory tests, the brittleness indices of more than 100 samples cored in Bukit Timah granite along the tunnel alignments of T05 and T06 tunnels of DTSS in Singapore were obtained. The brittleness index varies in a large range from less than 10 to more than 25. The tendency shows that the brittleness index decreases with the increase of the weathering grade of granite. A series of models were then set up to simulate the effect of rock brittleness on rock fragmentation process using UDEC. With the decrease of the brittleness index, the crushed zone decreases and the number and length of the main cracks outside the crushed zone also decrease. It is obvious that with the increase of the rock brittleness index the cutter indentation process gets easier. Through the statistical analysis of correlation between rock mass properties and the corresponding TBM performance in tunnel projects, it was noted that TBM penetration rate increases with increasing rock brittleness, which is consistency with the numerical simulation results. (c) 2006 Elsevier Ltd. All rights reserved.