高校地质学报2017，Vol.23Issue(1)：165-171,7.DOI:10.16108/j.issn1006-7493.2016170
TBM隧道围岩损伤区范围及渗透特性研究
Study of the Range and Permeability Characteristics of Excavation-damaged Zone of TBM Tunnel
摘要
Abstract
The excavation-damaged zone (EDZ) has significant influence on not only the stability of rock underground engineenng,but also the change of its permeability,which is the focus of some special projects such as nuclear waste disposal project.In order to study the range and permeability characteristics of EDZ,a series of ultrasonic velocity,permeability,and surface roughness tests were conducted on rock samples obtained from the Huanji Tunnel.It was found that (1) Due to the high rock strength and low to medium in-situ stress,the EDZ of the tunnel is mainly caused by the excavation of TBM;(2) The P-wave velocity of intact rock is between 4713 and 5376 m/s and the velocity of the damaged zone varies from 2943 to 4856 m/s.The P-wave velocities of intact rock and damaged zone of high-quality rock masses are larger than those of poor-quality rock masses.At the same time,the maximum decreasing ratio of P-wave velocity of poor-quality rock masses is slighthy larger than that of high-quality rock masses.In addition,the range of the EDZ is between 11.0 and 52.0 mm,and usually the surrounding rock with better quality shows a smaller rang of EDZ;(3) The permeability of intact rock and damaged zone of high-quality rock masses is smaller than that of poor-quality rock masses.In this study,the permeability of damaged zone,which was caused by TBM excavation,is 1.94 ～ 3.75 times larger than that of intact rocks;(4) The surface roughness of tunnel wall is between-5 and 4 mm,which satisfies the roughness requirement of SKB for disposal holes.关键词
TBM/花岗岩/开挖损伤区/超声波波速/渗透率/表面粗糙程度Key words
TBM/granite/excavation damaged zone (EDZ)/ultrasonic velocity/permeability/surface roughness分类
建筑与水利引用本文复制引用
卢广亮,赵晓豹,龚秋明,唐伟,李晓昭..TBM隧道围岩损伤区范围及渗透特性研究[J].高校地质学报,2017,23(1):165-171,7.基金项目
国家自然科学基金课题(41172241 （）
41372266) （）
国防科技重点项目(科工二司[2012] 492号)联合资助 （科工二司[2012] 492号）
