Pdf use of engineering geophysics to investigate a site. Group leader abdul mutakaber umair shams muhammad umar ramzan judge muhammad irfan asadullah shahid ali farooq akram mohsin ali zeeshan zain ul hassan rana shah zaman hafiz mateen arif muhammad noman muhammad junaid muhammad tariq waqas ali registration nos. Geophysical methods in exploration and mineral environmental investigations by donald b. The objective of a geotechnical site investigation for a dredging project is to ob tain the most complete and accurate estimate of the location and character of the materials to be dredged that is possible within the limits. This type of information is usually developed for inclusion in the license application or in reports providing conceptual analyses of existing project structures. List of acronyms with full names in jrc 2011 comparative analysis of. The main geological formations of the area are shown in figure 1. Geotechnical investigation and recommendations manual.
Hydrogeophysical and hydrogeological investigations of. In addition, recently developed methods were evaluated for depth profiling within the landfill. In addition to pumping tests, groundwater engineering provides a complete service for a wide range of groundwater investigation techniques. Phase 1 geotechnical investigation cedar ridge reservoir. The phase 2 ground investigation is usually undertaken using trial pits, boreholes, penetration tests, laboratory tests, and occasionally geophysical methods. Some of these tests provide information on subsurface soil characteristics without. The indirect methods of subsurface explorations are used extensively and involve application of geophysical techniques for obtaining fairly accurate idea of subsurface geology. The investigation program will consist of soil boring and sampling at desired intervals for subsequent observation and laboratory testing to determine the capacity of pile foundation economically and safely. Pdf geophysical method of investigating groundwater and sub. Multiple geophysical techniques for investigation and.
Basic manual on the detection and investigation of the. Depth of investigation of electrical methods principle of electrical methods fig 1 in electrical methods, a current i ab is transmitted into the ground with two electrodes a, b, while the difference of potential v mn produced by the circulation of this current into the geological layers is measured with two other electrodes m, n. This work shall be undertaken at a schedule of rates agreed upon prior to the commencement of the investigation. Presentation on geophysical methods linkedin slideshare. The average values of the groundwater characteristics obtained were 0. Study on developments inaccident investigation methods.
Geophysical surveys have been applied for subsurface characterization from beginning of the site investigations, decades ago. Onsite surveying used the gps tracking investigation on appropriate surveying method following the establishment of national disaster damage investigation system 9678. Specifically this appendix will help with the following tasks. Where the preliminary site investigation has established the feasibility of the project, a more detailed exploration program is undertaken. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Subsurface investigations of landslides using geophysical methods geoelectrical applications in the swabian alb germany rainer bell, janerik kruse, aiejandro garcia, tho mas glade, bonn, andreas hordt, braunschweig 1 introduction landslides may be considered as common natural hazards. The intrusive investigation is usually followed by the production of either factual or interpretative reports to clarify particular technical. Subsurface surveys extensive education and experience. Many of these methods involve the application of knowledge and experience in the fields of soil and rock mechanics and it is therefore difficult to derive direct correlation with hydrogeological properties. They can be used later in the investigation to confirm and improve site characterization. The investigation program will consist of soil boring and sampling at desired intervals for. Application of geophysical methods for site characterization. Planning and scope of work objectives the objective of the site investigation for a marine pipeline is to obtain sufficient reliable information to permit the safe and economic design of installation and permanent works. Application of modern seismic methods for geotechnical.
Accordingly, it is necessary to know the current practice in ground investigation and the manner in which soil parameter values are usually estimated. Sep 19, 20 seismic methods depending upon whether reflected waves or refracted waves are used in the investigation, there are two types of methods, namely, seismic reflection method and seismic refraction method. This was aimed at evaluating the subsoil conditions and groundwater quality of the area three years after the postspill cleanup exercise. This phase of field investigation should include surface and subsurface exploration and. Department of physics, university of adoekiti, ekiti state. The company has extensive experience in shallow exploratory geophysics, such as fault and geologic hazards investigations, tank and utility detection, water projects and well sightings, blast and vibration monitoring, archeological investigations, spill and plume mapping, forensic investigations, bedrock.
Manual on subsurface investigations engineering research. Geophysical survey involving electrical resistivity methods has been carried out at annunciation. Geophysical survey is the systematic collection of geophysical data for spatial studies. Geophysical investigations are principally applied at ground surface to measure the subsurface physical properties e. If you need to print pages from this book, we recommend downloading it as a pdf. The geophysical investigation involved the vertical electrical sounding ves technique using the schlumberger configuration and the horizontal profiling method. Insitu testing methods can be used as part of or to supplement drilling and sampling methods. Pdf use of engineering geophysics to investigate a site for. Investigations into the method of the social sciences with special reference to economics by carl menger, edited by louis schneider with an introduction by. Geotechnical investigation on proposed residential development at 220 north bayshore boulevard san mateo, california for city ventures by tmakdissy consulting, inc. Field investigation subsurface conditions were explored by four core borings advanced to depths ranging from 50 to 350 feet below existing grade. Geotechnical investigation procedures national driller. Geotechnical investigation customers often engage us during the initial planning and investigation stages for drilling and support services.
Investigation on appropriate surveying method following. Care of the samples also is critical to maintaining undisturbed conditions between drilling, transportation, storage and testing. This information will help you select the techniques that will best meet the data objectives. Numerical groundwater modelling can be used to assess likely flow. Electrical resistivity surveys were carried out at a site of shallow hydrocarbon contamination in ahoada, southsouth nigeria.
The electrical resistivity method is one that has been widely used because of the theoretical, operational and interpretational ease. The investigation manual pdf, investigation manual 2017 outlines techniques, methods and procedures followed. The second part of the investigation repor t documents the scope of the investigation program and the specific procedures used to perform this work. Table of contents section page montana department of. Groundwater investigations groundwater engineering. Detection and analysis of the geophysical signals forms the core of geophysical signal processing. The investigation of alluvial aquifers with large resistivity contacts by gnanasundar d and elango l, 1999, identification of the presence and location of a leachate plume, delineation of the. Application of modern seismic methods for geotechnical site. A geophone an amplifier and a galvanometer are the basic units required for reflected or refracted wave registrations. These tests include the standard penetration test spt, electric cone penetrometer test cpt, vane shear test vst and pressuremeter test pmt. The data from the two different approaches correlate well, and the generated profiles of the acquired data helped to map the contaminant plume, which was delineated as an area of high.
The intent of a geotechnical investigation report should be to document the investigation performed and present the data obtained. Desk top studies and research into existing information can be a very cost effective way to identify groundwater problems at an early stage. Fhwa nhi01031 federal highway administration washington, dc geotechnical site characterization july 2001 by paul w. The geotechnical investigation and recommendations manual is intended for continual updates to remain current as changes occur. Geophysical techniques offer the chance to overcome some of the problems inherent in more conventional ground investigation techniques. Nuclear event investigation methods, tools and techniques, interim technical.
Our investigation also included laboratory testing of selected soil samples. An investigation typically samples only a small percentage of the site. Camp roberts, built in 19411942, is located about 35 miles north of san luis obispo. Electromagnetic methods, such as magnetotellurics, ground penetrating radar and transienttimedomain electromagnetics, surface nuclear magnetic resonance also known as magnetic resonance sounding. Many of these methods involve the application of knowledge and experience in the fields of soil and rock mechanics and it is therefore difficult to derive direct correlation with. Geophysical method of investigating groundwater and subsoil.
Soil investigations and the determination of geotechnical. These sections will identify the types of investigation methods used. Manual on subsurface investigations national highway institute publication no. Geotechnical investigations for earthquake engineering. Subsurface investigations of landslides using geophysical. Investigation of extralegal, arbitrary and summary executions. It is therefore important to be able to characterise methods with regard to how well they fit the task at hand. The preliminary borings and data are used as a basis for locating additional borings, which should be confirmatory in nature, and determining the. This work shall be undertaken at a schedule of rates agreed upon prior to. This investigation may be preliminary such as a corridor study or it may be.
Unfortunately, this book cant be printed from the openbook. The investigation also revealed the presence of a confined aquifer in the area, with resistivity values of 869. Geotechnical site investigations for underground projects. Geophysical methods can be helpful in mapping areas of contaminated soil and groundwater. Geophysical investigation for groundwater using electrical. Geophysical methods have several important advantages, compared with conventional geotechnical field investigation methods which have limitations in terms of spread, coverage and the skyhigh cost.
Geophysical methods of groundwater exploration electrical resistivity method, seismic refraction method, determination of aquifer thickness, determination of top of the sloping aquifer 3. Measurements are taken at or near the surface and are classified by the physical property being measured. The magnetic and gravitational fields emanating from the earths interior hold essential information concerning seismic activities and the internal structure. In order to protect the lives of people and their property, the national disaster damage investigation system was designed on the basis of this study, which also was implemented by the most appropriate surveying method that should be applied during a disaster investigation through the two case studies for landslides and earthquakes. Geophysical investigation for groundwater using electrical resistivity method a case study of annunciation grammar school, ikere lga, ekiti state, southwestern nigeria lateef t.
The investigation area is located in the eastern part of greece, thirteen kilometers from the town of xanthi. This goes for physical tools as well as for methods. Remote sensing techniques, including hyperspectral. Geological site investigation civil engineering notes. This section describes various sampling and analysis methods available for vapor intrusion investigations. Geotechnical site investigations 1scopethis standard sets out minimum requirements for a geotechnical site investigation, as a component in the engineering design, construction, commissioning and operation of civil engineering and building works. Our geotechnical exploration rigs are able to obtain subsurface samples in challenging locations and ground conditions. Pdf geophysical method of investigating groundwater and. Investigations into the methods of the social sciences mises institute.
Seismic methods depending upon whether reflected waves or refracted waves are used in the investigation, there are two types of methods, namely, seismic reflection method and seismic refraction method. Site investigation code of practice geotechnical division. Investigation on appropriate surveying method following the. Site investigation code of practice rev0 saice geotechnical division this leads to the next important point, a site investigation is not complete without onsite confirmation during construction and allowance must be made during the procurement phase for this. These include imaging surveys acoustic and optical, and methods describing directly the physical properties of the rock mass, like magnetization, density, conductivity, and velocity. There are several methods available for obtaining undisturbed samples, and would depend on the investigation equipment being used and the state of the soils in situ. Geophysical method of investigating groundwater and sub. Given the relatively small sums of money involved in ground.