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Incorporating geotechnical and geophysical investigations for underground obstruction detection:A case study

Underground Space 2023年第4期11卷 116-129页

作者： Yaohui Liu Yannick C.H.Ng Yunhuo Zhang Ping Yang taeseo ku School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221000China Department of Civil and Environmental Engineering National University of Singapore117576Singapore Geotechnical&Tunnel Division Land Transport Authority Singapore219428Singapore Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Department of Civil and Environmental Engineering Konkuk UniversitySeoul 05029South Korea

Determining the location and boundary of underground obstructions and/or anomalies is a common problem and often a great chal-lenge for tunneling and underground *** this study,geotechnical investigations(penetration tests and borehole drilling/sam-pling)and geophysical investigations(surface wave method and cross-hole seismic method)were conducted with the aim of identifying the location and boundary of rock obstructions in Changi East,*** surface wave method is frequently used in the sites with lateral homogeneity in previous studies,but its application in the sites with rock obstructions is *** experimental results of this study indicate that the surface wave method is also able to determine the upper surface of rock obstructions,but difficult to identify the lateral and bottom boundaries of rock *** improve the precision of detection,the full waveform inversion(FWI)method was used to process the data from the cross-hole seismic *** results indicate that the inversion precision of P-wave is higher than that of *** horizontal and vertical ranges of rock obstructions in the P-wave inversion results are 14–26 m and 7.5–11.0 m respectively,roughly consistent with the results of penetration tests(about 15–25 m)and borehole log(8.85–10.80 m).This result proves that the sequential application of first-arrival time analysis and FWI can effectively delineate the boundary of rock ***,the results of various detection methods were analyzed and compared in this *** the advantages of various methods,we propose a cost-effective and high-precision workflow containing both geotechnical and geophysical investigations.

关键词： FWI Geotechnical and geophysical investigations Cross-hole seismic method Surface wave method Obstruction detection

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Practical configured microtremor array measurements(MAMs)for the geological investigation of underground space

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Underground Space 2021年第3期6卷 240-251页

作者： taeseo ku Subramaniam Palanidoss Yunhuo Zhang Sung-Woo Moon Xiao Wei Ean Seong Huang Jeyatharan kumarasamy Kok Hun Goh Department of Civil and Environmental Engineering National University of SingaporeSingapore Geotechnical and Tunnel Division Land Transport AuthoritySingapore Department of Civil and Environmental Engineering Nazarbayev UniversityKazakhstan Geosystems Land Transport AuthoritySingapore Infrastructure Design and Land Land Transport AuthoritySingapore

Underground space utilization is becoming increasingly essential for modern metropolitan cities such as *** a soil/rock interface using traditional borehole investigation methods is expensive and difficult,owing to the numerous physical constraints within a built-up *** are often far apart,resulting in many unforeseen ground conditions during subsequent *** methods are sometimes employed as possible alternatives for fast,economical,and efficient bedrock *** goal of this study is to investigate the practical details of applying microtremor array measurement(MAM)as a non-invasive surface wave survey for mapping soil/rock interfaces in *** configurations in field data acquisition are examined,and practical recommendations for array construction are *** addition,30 in situ MAM tests are carried out for two major geological formations in *** the results,a standard shear wave velocity(V_(s))of 500 m/s is found to be suitable for interpreting the soil/rock interface,for the Bukit Timah Granite and Jurong ***,the method does not predict well when soft Kallang formation deposits are *** limitations are also discussed in the later parts of this *** and practical recommendations are discussed,providing constructive guidance to the *** proposed Vs-based method and associated guidelines and limitations can be used to create a digital geological database and are especially useful for rock profiling in an urban environment.

关键词： Array configuration MAM Non-invasive site investigation Soil/rock interface Surface wave survey

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含水量对水泥加固含黏粒砂土的强度影响

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地基处理 2022年第S1期4卷 6-13页

作者：魏骁 ku taeseo 杨仲轩浙江大学建筑工程学院浙江杭州310058 新加坡国立大学土木与环境工程系新加坡119077 建国大学土木与环境工程系韩国首尔05029

水泥加固是有效且常用的土体加固方法之一。工程上采用无侧限抗压强度衡量土体加固效果,但是由于土体加固后的强度受多种因素的复杂影响,目前尚无统一的方法可以合理表征和预测土体经水泥加固后的强度。本研究利用土单元体试验方法,研... 详细信息

水泥加固是有效且常用的土体加固方法之一。工程上采用无侧限抗压强度衡量土体加固效果,但是由于土体加固后的强度受多种因素的复杂影响,目前尚无统一的方法可以合理表征和预测土体经水泥加固后的强度。本研究利用土单元体试验方法,研究了含水量对于水泥加固含细粒砂土强度的影响,建议采用“水胶比”用于水泥加固含黏粒砂土的配合比设计;还研究了含水量对加固后砂土的剪切波与超声波速的影响,利用剪切波和超声波速表征加固后土体的无侧限抗压强度,且该经验关联基本不受含水量、水灰比、水泥掺入比和养护龄期的影响,可以用于现场强度检测和监测。最后,对含水量影响水泥加固土体强度的机理进行了探讨。

关键词：水泥加固含黏粒砂土强度波速含水量细粒含量

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