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

Liu Liu ¹Shaojun Li ¹Minzong Zheng ¹Dong Wang ²Minghao Chen ²Junbo Zhou ³Tingzhou Yan ⁴Zhenming Shi⁵

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作者信息

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;Hubei Communications Planning and Design Institute CO.,LTD.,Wuhan 430051,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
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Abstract

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 anal-ysis of typical borehole drilling detection data shows that the impact drilling source is a pulse-like seis-mic 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.

Key words

Deep buried tunnel/Wave velocity field/Borehole drilling/Tomography/Rock mass

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基金项目

National Natural Science Foundation of China(42207211)

National Natural Science Foundation of China(42202320)

National Natural Science Foundation of China(42172296)

Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University(KLE-TJGE-G2304)

Wuhan Changsheng Engineering Exploration Technology Development Co.,Ltd()

出版年

2024

矿业科学技术学报(英文版)

中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDEI

影响因子：1.222

ISSN：2095-2686

参考文献量2

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