千岛湖配水工程隧洞超前预报中的综合物探技术

doi:10.11720/wtyht.2019.1335

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Abstract

The authors adopted TSP, ground penetrating radar and infrared acquisition technology to tunnel advance prediction of Thousand-island Lake water distribution project. Several conclusions have been drawn as follows: Firstly, TSP has a low resolution for detecting karst caves but has a good effect for detecting fractured rock mass, its anomaly features show that the Young’s modulus, density and P-wave velocity are low. Secondly, ground penetrating radar is very suitable for tunnel prediction in limestone area, radar reflection profile exhibiting strong amplitude and hyperbolic event usually indicates the development of karst caves. Thirdly, infrared acquisition is greatly influenced by hydration heat of shotcrete in tunnel so that it cannot be used alone in tunnel geological prediction; the defect is especially obvious when the quality of surrounding rock is poor.

Key words： TSP ground penetrating radar infrared acquisition Thousand-island Lake water distribution project advance prediction tunnel engineering

Received: 14 September 2018 Published: 10 April 2019

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	Articles by authors
	Jun-Jie LI
	Qing-Qiang XU
	Jian-Qiang LI
	Jian-She HE
	Jia-Hao GUO

Cite this article:

Jun-Jie LI,Qing-Qiang XU,Jian-Qiang LI, et al. The application of geophysical prospecting technology to tunnel advance prediction in Thousand-island Lake water distribution project[J]. Geophysical and Geochemical Exploration, 2019, 43(2): 428-434.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1335 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I2/428

The observation system of TSP

Statistical results of TSP for common lithologic of Thousand Island Lake water transfer project

Schematic diagram of infrared measuring points arrangement

Prediction results of TSP of stake number K84+492~K84+342 in Wangjia tunnel

GPR profiles of stake number K84+429~K84+399 as well as frequency spectrums of typical single-trace in Wangjia tunnel
a—GPR profile;b—time-frequency spectrum of the 32nd trace

Prediction results of TSP of stake number K7+985~K7+785 in Hong Qiu-tang tunnel

The karst cave extends toward the left side of tunnel

Thin layer mudstone in tunnel face

GPR profiles of stake number K11+558~K11+528 as well as frequency spectrums of typical single-trace in Lianhua tunnel
a—GPR profile;b—time-frequency spectrum of the 62nd trace

Mud filled karst cave on the left and right sides of the tunnel near stake number K11+556 in Lianhua tunnel

Infrared detection results in Tunnel face in Xueao tunnelμW/cm²

Infrared detection results along axial direction of tunnel in Xueao tunnel

Infrared detection results in Tunnel face in Fenshuijiang tunnelμW/cm²

Infrared detection results along axial direction of tunnel in Fenshuijiang tunnel

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