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Integrated investigation for geological detection and grouting assessment; a case study in Qingdao subway tunnel, China

Abstract

Subway tunnel construction plays a significant role in the development of urban underground space. Advance surface grouting treatment of adverse subsurface geological bodies is an effective measure to avoid the accidents during subway construction. This paper describes the successful application of geological prospecting and grouting assessment at the tunnel site of Qingdao subway line No. 1. The study area is located in a coastal bedrock fissure water distribution area. It was decided to conduct surface grouting to reduce the high risk of water inrush. Integrated investigation consisting of electrical resistivity tomography (ERT), seismic ahead prospecting, surface vertical drilling and cross-hole ERT was conducted to ascertain the geological conditions and guide the grouting scheme design. Surface ERT and seismic ahead prospecting were adopted to provide a rough survey of water bearing conditions and fractured zones. Then, detailed imaging was conducted using cross-hole ERT inversion with the inequality constraint based on the information obtained using surface vertical drilling. The shape and location of three water bearing structures were identified. Based on the integrated investigation results, an appropriate grouting scheme was designed. After the application of grouting, cross-hole ERT was carried out again to assess the effect of grouting by comparing the vibration of twice inversion results of cross-hole ERT and resistivity tests of the grout sample. Such information serves as a basis for guiding geotechnical excavations in complex urban environments and avoids the risk of construction accidents.


ISSN: 1083-1363
EISSN: 1943-2658
Serial Title: Journal of Environmental & Engineering Geophysics
Serial Volume: 24
Serial Issue: 4
Title: Integrated investigation for geological detection and grouting assessment; a case study in Qingdao subway tunnel, China
Title: Geophysics for urban underground space studies
Author(s): Guo QianPan YonghaoLiu RentaiLiu BinLiu Zhengyu
Author(s): Liu, Lanboprefacer
Author(s): Qian Rongyiprefacer
Affiliation: Shandong University, Geotechnical and Structural Engineering Research Center, Shandong, China
Affiliation: University of Connecticut, Department of Geosciences, Storrs, CT, United States
Pages: 629-639
Published: 201912
Text Language: English
Publisher: Environmental and Engineering Geophysical Society, Englewood, CO, United States
References: 18
Accession Number: 2020-006973
Categories: Engineering geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
N34°30'00" - N38°00'00", E115°00'00" - E122°34'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, copyright, Environmental & Engineering Geophysical Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202006
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