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Offshore site investigation
Published in White David, Cassidy Mark, Offshore Geotechnical Engineering, 2017
Typically, a geotechnical investigation is performed after the geophysical investigation has taken place and the results have been examined. Sometimes, however, only a geo-technical investigation is carried out in order to reduce costs or because of the small extent of the site to be investigated. The lack of geophysical data increases the risk from unforeseen problems and resolving differences across the site. The main goal of the geotechnical investigation is to characterise the soil properties by means of in situ tests and samples that are subsequently examined and tested. In most cases, the geo-technical investigation ground-truths geophysical interpretation and can thus enhance understanding of the seabed sediments on a regional basis. The geotechnical properties obtained from the field investigation and subsequent laboratory work provide the basis for the engineering parameters required for design of foundations and other offshore infrastructure.
Hydropower potential and underground construction risks in Nepal Himalayan region
Published in Bjørn Honningsvåg, Grethe Holm Midttømme, Kjell Repp, Kjetil Arne Vaskinn, Trond Westeren, Hydropower in the New Millennium, 2020
The geotechnical investigation for the project included geological mapping, geophysical tests, testhole drilling and laboratory testing of rock samples. For investigation of sub-surface rock conditions, three diamond core testholes were drilled at the top shaft area, the most critical location regarding waterways design. Drilling in the vicinity of the underground powerhouse, which is more than 300 m below a steep hillside, was not economically justified. The permeability tests were carried out in the testholes by the constant head method and by the falling head method. Different lab tests were performed on fresh rock samples selected from rock cores.
Geotechnical characterization
Published in Manuel Matos Fernandes, Analysis and design of geotechnical structures, 2020
Data analysis of all this information, as well as the preliminary site survey data, is compiled in a report. This will form the basis of the preliminary design or viability studies stage of the construction works. This report will also allow definition of the most appropriate geotechnical investigation program for the project. In general, the geotechnical investigation comprises geophysical and geomechanical investigations.
Prediction of standard penetration test N-value from dynamic probing light N-value using ANFIS and multiple regression models
Published in International Journal of Geotechnical Engineering, 2021
Mohammadjavad Arabpour Roghabadi, Mehdi Momeni, Zahra Zangenehmadar
There are various in situ testing methods for geotechnical investigation such as standard penetration test (SPT), cone penetration test (CPT), and dynamic probing light (DPL). In spite of continuous developments in the SPT, DPL is utilized extensively in field investigations. DPL is believed to be one of the most prominent penetration tests and has been used in different parts of the world. This high-speed gadget has numerous advantages and is not expensive (Lingwanda, Larsson, and Nyaoro 2015). Therefore, knowing the correlation between SPT and DPL N-values leads to identifying soil parameters because they are mostly related to SPT N-value. Such correlations are considered significant especially in low-to-moderate risk projects (Robertson 2012). Although DPL is more practical and functional, there is no comprehensive literature review on DPL and its application. There are a few studies on determining local interrelations between SPT N-values and DPL N10-values since DPL is less well known in comparison to SPT and CPT.
Predicting dynamic geotechnical parameters in near-surface coastal environment
Published in Cogent Engineering, 2019
Adewoyin Olusegun Oladotun, Joshua Emmanuel Oluwagbemi, Akinyemi Marvel Lola, Omeje Maxwell, Akinwumi Sayo
The difficulty, delay and high expenses, involved in conducting a geotechnical investigation are few of the factors that discourage many building developers from carrying out site characterization. These have made many private developers carry out various construction projects without undertaking proper site investigation (Abudeif, Raef, Abdel Maneim, Mohammed, & Farrag, 2017; Adewoyin, Joshua, Akinwumi, Omeje, & Joel, 2017). One of the consequences of this is its significant contribution to the incessant building collapse experienced in many developing countries. An attempt to simplify, reduce the cost and reliably estimate the geotechnical parameters needed for proper foundation design will be a major contribution to the field of geotechnical engineering. Using geophysical techniques to predict the required geotechnical parameters has the potential to make this contribution. Typically, the results of geotechnical tests are for point measurements but geophysical investigation techniques can give volumetric measurement and produce an image of the subsurface without physically disturbing the subsoil (Mohd, Rosli, Fauziah, Devapriya, & Mohamed, 2012).
GPR analysis to detect subsidence: a case study on a loaded reinforced concrete pavement
Published in International Journal of Pavement Engineering, 2022
Mercedes Solla, Norberto Fernández
The geotechnical investigation involves obtaining a soil sample within the area of study for the determination of soil properties such as sieve analysis, Atterberg limits, organic content of soil, etc. The hole drilled S-1 was extracted, as close as possible to the western area of Hall B (Figure 3). The equipment used was a TECOINSA TP-30LR probe, which allows to drill 101–86 mm diameter holes. Tables 1 and 2 present the results obtained from the laboratory tests for a sample between 1.9 and 2.5 m depth (anthropic fillings). According to the Unified Soil Classification System (USCS), the soil was classified as SM – silty sands with variable amounts of gravel.