Rapid profiling rock mass quality underneath tunnel face for Sichuan-Xizang Railway  

作　　者：Siyuan Wu Min Qiu Zhao Yang Fuquan Ji Zhongqi Quentin Yue 

机构地区：[1]Department of Civil Engineering,The University of Hong Kong,Hong Kong 999077,China [2]CCCC Second Harbor Engineering Company Ltd.,Wuhan 430000,China [3]Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure,Wuhan 430000,China

出　　处：《Underground Space》2024年第6期138-152,共15页地下空间（英文）

基　　金：partially supported by grants from the Research Grant Council of the Hong Kong,China(Project Nos.HKU 17207518 and R5037-18)。

摘　　要：The Sichuan-Xizang Railway is a global challenge,surpassing other known railway projects in terms of geological and topographical complexity.This paper presents an approach for rapidly profiling rock mass quality underneath tunnel face for the ongoing construction of the Sichuan-Xizang Railway.It adopts the time-series method and carries out the quantitative analysis of the rock mass quality using the depth-series measurement-while-drilling(MWD)data associated with drilling of blastholes.A tunnel face with 15 blastholes is examined for illustration.The results include identification of the boundary of homogeneous geomaterial by plotting the blasthole depth against the net drilling time,as well as quantification of rock mass quality through the recalculation of the new specific energy.The new specific energy profile is compared and highly consistent with laboratory test,manual logging and tunnel seismic prediction results.This consistency can enhance the blasthole pattern design and facilitate the dynamic determination of charge placement and amount.This paper highlights the importance of digital monitoring during blasthole drilling for rapidly profiling rock mass quality underneath and ahead of tunnel face.It upgrades the MWD technique for rapid profiling rock mass quality in drilling and blasting tunnels.

关 键 词：Measurement-while-drilling Drilling and blasting Rock mass quality New specific energy Constant penetration rate Sichuan-Xizang railway TUNNELLING 

分 类 号：P31[天文地球—固体地球物理学]