2 edition of use of geophysical surveying methods in the detection of natural cavities and mineshafts found in the catalog.
use of geophysical surveying methods in the detection of natural cavities and mineshafts
D. M. McCann
Written in English
Photocopied from: Quarterly Journal of Engineering Geology, London, 1987, Vol. 20.
|Other titles||Quarterly Journal of Engineering Geology.|
|Statement||D. M. McCann, P. D. Jackson & M. G.Culshaw.|
|Contributions||Jackson, P. D., Culshaw, M. G.|
|The Physical Object|
|Number of Pages||73|
ii Overview 1. The course text book is: An Introduction to Geophysical Exploration, by P. Kearey, M. Brooks and I. Hill, 3rd edition Blackwell Science, , ISBN, cost new ~ £ For the Michaelmas Term you will be expected to read and study Chapters 1, 6 & 7. The detection of the precise locations of voids is a major challenge but at the same time, it is a matter of necessity for risk assessment of collapse and for avoiding any destruction associated with soil degradation. This problem becomes increasingly complex in areas where the presence of natural Cited by: 7.
presentation on geophysical methods 1. presentation/lecture on geophysical methods site investigation and laboratory measurements (civ ) andrew abah onoja sps/15/mce/ – civil engineering department of civil engineering bayero university, kano 16th june, 2. pipelines. Geophysical investigations are most effective when used in conjunction with a drilling or boring program and should not be a substitute for such a program. Typically, one may apply multiple methods to refine the conceptual models. Use of multiple methods also hedges against one method failing to File Size: KB.
Detection of Natural or Manmade Cavities Gravity: Subsurface Cavity Detection Geophysical methods are usually further sub-divided into active and passive methods. Passive methods include methods that detect natural variations within the natural fields associated with the Earth, such as magnetic and gravitational fields. The most commonly used first step in geophysical exploration process is the aeromagnetic survey. A magnetometer or often a series of magnetometers are attached to an aircraft in a stinger, or wingtip pods to measure the intensity of the earth's magnetic field, thereby permitting the detection of magnetic anomalies caused by the minerals that are present in the ground.
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The use of geophysical methods for the location of cavities and mineshafts is reviewed in relation to engineering problems at the site investigation stage.
Their success is limited by the resolution and penetration achieved by the particular method applied in a given by: Subsurface Surveys, an applied geophysics company, uses a variety of geophysical methods to solve engineering, geological, environmental and forensic problems.
The methods and instruments we use are chosen to meet the specific needs of our clients and accommodate the existing field conditions. Geophysical Areas Covered • Seismic RefractionFile Size: 1MB. Mitigation of natural hazards can best be achieved through careful geoscientific studies.
Traditionally, engineers use destructive probing techniques for the detection of cavities across regular grids or random distances. Such probing is insufficient on its own to provide confidence that cavities will not be by: Geophysical survey is the systematic collection of geophysical data for spatial studies.
Detection and analysis of the geophysical signals forms the core of Geophysical signal processing. The magnetic and gravitational fields emanating from the Earth's interior hold essential information concerning seismic activities and the internal structure.
impact, geophysical survey (remote sensing), coring and augering, and backhoe trenching. Because ground disturbances affect the results of these surveys, the order in which the methods were applied to each test locale followed their relative amount of subsurface disturbance (i.e.
() The use of geophysical surveying methods in the detection of natural cavities and mineshafts. Quarterly Journal of Engineering Geology 59 – OpenUrl Abstract / FREE Full TextCited by: 2.
The use of the geophysical techniques, such as the High Resolution Seismic, the microgravity and the electric resistivity, for the detection of the underground cavities is not a new approach. During the last 20 years, published applications recall the potential of these techniques to detect and locate shallow cavities (depth Cited by: 1.
The use of geophysical surveying methods in the detection of natural cavities and mineshafts. shafts generally present the greatest challenge for detection using geophysical methods, as. Geophysical detection of underground cavities. The book covers all aspects of acquisition, processing and interpretation of shallow reflection seismic data for geotechnical and environmental.
Bates, E. R.,Detection of subsurface cavities: U.S. Army Engineer Waterways Experiment Station Miscellaneous Paper no. S, 83 p. GEOPHYSICAL METHODS IN EXPLORATION AND MINERAL ENVIRONMENTAL INVESTIGATIONS by Donald B.
Hoover, Douglas P. Klein, and David C. Campbell INTRODUCTION In the following discussion, the applicability of geophysical methods to geoenvironmental studies of ore deposits is. During construction, geophysical techniques used as economical and rapid quality control or process control tools are represented.
The use of geophysical methods after the completion of the project is demonstrated as a means to monitor the overall health or determine the causes or consequences of localized or general construction problems.
Geophysical techniques evaluated were ground probing, radar, acoustic seismic and refraction seismic methods. Based upon the results of geophysical tests and their comparison to known geologic conditions it was concluded that the radar technique showed the greates promise for use as an aid and “guiding-tool” in the execution of the grouting Cited by: eral introduction to the main geophysical methods in widespread use.
The survey methods There is a broad division of geophysical surveying meth-ods into those that make use of natural ﬁelds of the Earth and those that require the input into the ground of artiﬁ-cially generated natural.
In this book many examples of the successful integration of geophysical surveys into the site investigation process are described. The authors are drawn from many different countries and the case histories presented clearly indicate the importance of geophysical methods in the construction history in a world-wide context.
Geophysical exploration using measurements of the earth's magnetic field was employed earlier than any other geophysical technique. von Werde located deposits of ore by mapping variations in the magnetic field in InThalen published the first geophysical manuscript entitled The Examination of Iron Ore Deposits by Magnetic Measurements.
Abstract. The aim of this research carried out by Istituto Nazionale di Oceanografia e di Geofisica Sperimentale-OGS Trieste, was to apply several geophysical methodologies such as Earth Resistivity Tomography, G round P enetrating R adar, and microgravity survey to detect cavities in karst area.A well-known cavity system was chosen as the test site, in order to verify geophysical data with a.
The detection of the precise locations of voids is a major challenge but at the same time, it is a matter of necessity for risk assessment of collapse and for avoiding any destruction associated with soil degradation. This problem becomes increasingly complex in areas where the presence of natural cavities is not by: 7.
Below is a listing of the surface, borehole, and water-borne geophysical methods supported by OGW BG, including emerging techniques under development.
The Branch also supports selected methods for hydraulic testing in boreholes that are commonly used in conjunction with borehole geophysical methods. geophysical methods and geophysical contractors, respectively.
Use of geophysics by transportation agencies is reviewed through a summary of NCHRP Synthesis Use of Geophysics for Transportation Projects (Sirles, ). Geophysical survey methods are becoming increasingly accepted and implemented in the field of mineral exploration. These surveys provide a reasonably reliable idea of the types of minerals and hydrocarbons present below the ground without any actual digging or tunnelling.Unfortunately, the detection of voids by geophysical surveying is extremely difficult.
This is because the resolution provided by the various geophysical methods and the depths of penetration offered by the methods rarely match the need to map relatively small voids at distances far enough to avoid by: Geophysical methods descriptions: electrical & EM, seismic, potential fields; deep and near-surface methods used for geophysical surveys.