Using slurry TBM data to assess the variability of weathered Kowloon granite

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-04-20 DOI:10.1144/qjegh2022-032
J. N. Shirlaw, T. Henderson, Ivan S. Haryono, Francois Dudouit, David Salisbury
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Abstract

Parallel running tunnels were driven by a 7.46m diameter slurry tunnel boring machine (TBM) through weathered Kowloon granite in Hong Kong for MTR Contract SCL 1103. The final part of the tunnelling was in a full face of Grade III or Grade II rock, up to 50m below rockhead. Using the data obtained during the tunnelling, the average strength of the rock was calculated for every ring of advance. The distribution of the rock strength calculated from the two drives was similar, and comparable with the data from the ground investigation. The strength assessed from the TBM data shows a notably sawtooth profile along each drive, with large changes in strength over relatively short distances. The change in strength between each advance averaged 13 MPa, and locally reduced by 80% over 9m. The changes in strength indicate that the rock had been weakened locally by weathering, consistent with the early stages of the formation of a corestone weathering profile. The focus of the weathering was on a set of inferred joints spaced at an average of about 17m that represented a small proportion of the joints encountered during tunnelling.
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利用浆液掘进机数据评估九龙风化花岗岩的变异性
平行运行的隧道由直径7.46m的泥浆隧道掘进机(TBM)驱动,穿过香港风化的九龙花岗岩,用于港铁合同SCL 1103。隧道开挖的最后一部分是在三级或二级岩石的整个表面上,高达岩头以下50米。利用隧道开挖过程中获得的数据,计算了每个推进环的岩石平均强度。从两个驱动计算的岩石强度分布相似,并且与地面调查的数据可比较。根据TBM数据评估的强度显示,沿每个驱动器都有明显的锯齿形轮廓,在相对较短的距离内强度变化较大。每次推进之间的强度变化平均为13MPa,在9m以上局部降低了80%。强度的变化表明,岩石已被风化局部削弱,这与岩心风化剖面形成的早期阶段一致。风化的重点是一组推断的节理,平均间隔约17m,这代表了隧道开挖过程中遇到的一小部分节理。
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来源期刊
CiteScore
3.40
自引率
14.30%
发文量
66
审稿时长
6 months
期刊介绍: Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House. Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards. The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.
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