Inverting the rock mass P-wave velocity field ahead of deep buried tunnel face while borehole drilling  

作　　者：Liu Liu Shaojun Li Minzong Zheng Dong Wang Minghao Chen Junbo Zhou Tingzhou Yan Zhenming Shi 

机构地区：[1]State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China [2]China Railway Eryuan Engineering Group CO.,LTD.,Chengdu 610031,China [3]Department of Hydraulic and Hydropower Engineering,Tsinghua University,Beijing 100084,China [4]Hubei Communications Planning and Design Institute CO.,LTD.,Wuhan 430051,China [5]Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China

出　　处：《International Journal of Mining Science and Technology》2024年第5期681-697,共17页矿业科学技术学报（英文版）

基　　金：the support of the National Natural Science Foundation of China(Nos.42207211,42202320 and 42172296);Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University(No.KLE-TJGE-G2304).

摘　　要：Imaging the wave velocity field surrounding a borehole while drilling is a promising and urgently needed approach for extending the exploration range of the borehole point.This paper develops a drilling process detection(DPD)system consisting of a multifunctional sensor and a pilot geophone installed at the top of the drilling rod,geophones at the tunnel face,a laser rangefinder,and an onsite computer.A weighted adjoint-state first arrival travel time tomography method is used to invert the P-wave velocity field of rock mass while borehole drilling.A field experiment in the ongoing construction of a deep buried tunnel in southwestern China demonstrated the DPD system and the tomography method.Time-frequency analysis of typical borehole drilling detection data shows that the impact drilling source is a pulse-like seismic exploration wavelet.A velocity field of the rock mass in a triangular area defined by the borehole trajectory and geophone receiving line can be obtained.Both the borehole core and optical image validate the inverted P-wave velocity field.A numerical simulation of a checkerboard benchmark model is used to test the tomography method.The rapid convergence of the misfits and consistent agreement between the inverted and observed travel times validate the P-wave velocity imaging.

关 键 词：Deep buried tunnel Wave velocity field Borehole drilling Tomography Rock mass 

分 类 号：U452.12[建筑科学—桥梁与隧道工程]