Building the geological model: case study of a rock tunnel in SW England

Fookes, P. G.; Shilston, D T

doi:10.1144/gsl.eng.2001.018.01.18

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…it is site and project specific. Fookes & Shilston (2001) (Fookes et al 2000). This strategy involves the 15 systematic evaluation of the inputs to the conceptual engineering geological model and might typically include:…”

Section: The Conceptual Engineering Geological Approachmentioning

confidence: 99%

Engineering geological models: an introduction: IAEG commission 25

Parry

Baynes²,

Culshaw

et al. 2014

Bull Eng Geol Environ

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The generation and use of engineering geological models should be a fundamental activity for any geotechnical project. Such models are an essential tool for engineering quality control and provide a transparent way of identifying project-specific, critical engineering geological issues and parameters. Models should also form the basis for designing the scope, the method and assessing the effectiveness of site investigations. However, whilst the idea of models in engineering geology has existed for several decades, there has been little published that systematically distinguishes the different model types and how and when they might be used. This paper presents the views of IAEG Commission C25 on the 'Use of Engineering Geological Models'.

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Section: The Conceptual Engineering Geological Approachmentioning

confidence: 99%

Engineering geological models: an introduction: IAEG commission 25

Parry

Baynes²,

Culshaw

et al. 2014

Bull Eng Geol Environ

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show abstract

“…A good model of site conditions allows both engineers and geologists to understand the spatial relationship and interactions of the many geologic and hydrologic components that make up the site (Hoek 1999 (Fookes and Shilston 2001 ). One of the benefi ts of the conceptual model is in its ability to help in anticipate conditions (Fookes 1997 ).…”

Section: The Conceptual Modelmentioning

confidence: 99%

The Strategy

Benson¹,

Yuhr²

2016

Site Characterization in Karst and Pseudokarst Terraines

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The objective of the site characterization process is to develop an understanding of the geologic conditions (both regional and site-specifi c), which is suffi ciently complete and accurate so that a conceptual geologic model of the subsurface can be created with reasonable confi dence level for the intended project needs. The diffi culty is one of solving the three-dimensional geologic/hydrologic puzzle with many variables and unknowns. The success of a site characterization effort lies in the ability to locate, describe and quantify the natural geological, and hydrological heterogeneity at a site. Heterogeneity is a natural result of the processes that create and modify the geologic setting, and are sometimes further modifi ed by man's activities. The presence of karst typically complicates the process by introducing a higher level of heterogeneity in the three-dimensional geologic puzzle. It can often be the fatal fl aw for a project.Site characterization must focus upon obtaining a thorough and complete understanding of geologic conditions that will impact the site. While uncertainties, assumptions and opinions are a part of any site characterization (Fig. 12.1a ), they should be minimized. Interpretations must be supported in a logical and obvious way by suffi cient data, which have been tested and proven to be correct. A solid base of data enables us to carry out subsequent efforts such as modeling, risk assessment, construction, or remediation with greater confidence and accuracy while minimizing uncertainties, assumptions and opinions ( Fig. 12.1b ) (Benson et al. 1996 ;Yuhr et al. 1996 ). The Detection DilemmaOne of the biggest problems with site characterization efforts has been our ability to effectively locate and map subsurface geologic conditions especially localized anomalous conditions. This is particularly true in fractured rock and karst conditions due to their limited spatial extent, which represent less than 1-5 % of the subsurface area. As a result traditional approaches to investigation, using borings, have a very low probability of intersecting these features. Beginning in the 1950s the development of geophysical instrumentation and its application to characterization of shallow subsurface conditions began. Since then digital technology has resulted in a greatly expended group of geophysical tools for our site characterization tool box (Olhoeft 1994 ). This has provided us with three basic approaches that can be used to improve our ability to detect and evaluate subsurface conditions and geologic variability. They are:In most site characterization efforts all three approaches will be employed to effectively converge upon a complete and accurate conceptual model of site conditions. Direct DetectionDirect detection of geologic conditions can be accomplished in a number of ways such as by observations at outcrops, conventional drilling and sampling, or trenching. This provides a very high level of confi dence in the detailed data from a local area or the area immediately within the bo...

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“…However, the engineering characteristics of LS in different sources differ depending on the chemical and physical process. The degree of weathering (IW) of the LS can be evaluated from the silica to sesquioxide ratio based on the following equation [1].…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Tropical Residual Soil with Cement and Biomass Bottom Ash

Busabongpaitoon

Lukjan

Iyaruk

2022

KEM

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This paper investigates an experimental study of cement-stabilized lateritic soil (CSLS) for road construction. The investigation focused on the mechanical properties and the potential of using biomass bottom ash (BBA) as aggregate materials based on the soil-cement standard of Thailand. CSLS specimens were prepared with different contents of BBA (40%, 60%, 80%, and 100%) and hydraulic cement (3%, 5%, and 7%). A series of unconfined compression tests were carried out to present the strength development of the mixtures. The strength development index value indicated the feasibility of using BBA as aggregate materials with the replacement of the lateritic soil (LS) mass by 60% or more. The replacement of LS by BBA of 80% with 5% cement for soil-cement subbase, and 7% cement for soil-cement base courses, is recommended.

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Building the geological model: case study of a rock tunnel in SW England

Cited by 4 publications

References 3 publications

Engineering geological models: an introduction: IAEG commission 25

Engineering geological models: an introduction: IAEG commission 25

The Strategy

Stabilization of Tropical Residual Soil with Cement and Biomass Bottom Ash

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