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LE 5 cardo

LE 5 cardo
51問 • 2年前
  • Mharvie Nagal
    • 通報

    問題一覧

  • 1

    It is the Exploration or Discovery of the ground conditions to enable engineers to make informed design.

    Site Investigation

  • 2

    Purposes/Importance of Site Investigation

    Suitability, Design, Construction, Effect Of Changes, Choice Of Site

  • 3

    - Determined by conducting extensive and intensive geological surveys

    Geological Structure Of The Area

  • 4

    - The relative position of the water table concerning the project must be thoroughly established

    Ground Water Conditions In The Region

  • 5

    - It includes the type of rocks that make up different parts of the area

    Lithology Of The Area

  • 6

    - This shows the interactions between humans and the physical environment.

    Seismicity Of The Region

  • 7

    - It is the collation and review of information's already available about the site

    Desk Study

  • 8

    - Preferred for complex projects, major engineering works, and heavy structures.

    Detailed Exploration

  • 9

    - The initial document search should be followed by walkover survey of the site and its surroundings

    Site Reconnaissance

  • 10

    - A sub-soil investigation or exploration report.

    Preparation Of Soil Investigation Report

  • 11

    - The main objective of preliminary site exploration is to obtain an appropriate picture of sub-soil conditions at a low cost. It is also called General Site Exploration.

    Preliminary Site Exploration

  • 12

    - It is a set of methods used in site investigation to provide information about the surface and subsurface geological conditions, without the need for excavation or drilling.

    Geological Method

  • 13

    Types Of Geological Method

    Surface Exploration, Subsurface Exploration

  • 14

    can include geologic mapping, geophysical methods, and photogrammetry, or it can be as simple as a geotechnical professional walking around on the site to observe the physical conditions at the site.

    Surface Exploration

  • 15

    - To obtain information about the soil conditions below the surface, some form of __________ is required.

    Subsurface Exploration

  • 16

    Geological Methods - Surface Exploration

    Aerial Surveys, Photogeology, Hydrogeological Surface

  • 17

    - The entire area involving an engineering study is photographed using sophisticated cameras and controls from low flying aeroplanes.

    Aerial Surveys

  • 18

    - Imageries obtained from satellite surveys and aerial surveys, when interpreted properly, provide useful details regarding rock outcrops on the surface with possibilities of estimating their subsurface configuration.

    Photogeology

  • 19

    - It is conducted partly on the surface with a view of recording the following details that are of immense help in the later studies

    Hydrogeological Surface

  • 20

    Geological Methods - Subsurface Exploration

    Direct Method, Indirect Method

  • 21

    - involve examination of rocks or materials of the underground by digging of drill holes, trial pits, adits, shafts, galleries and exploratory tunnels. In such explorations, both the underground areas are reached for direct examination and testing or samples are obtained which are examined and tested in the laboratory.

    Direct Method

  • 22

    - used extensively and involve application of geophysical techniques for obtaining fairly accurate idea of subsurface geology.

    Indirect Method

  • 23

    involve simple methods of study made on the surface with the aim of ascertaining subsurface detail. This is achieved by measuring certain physical properties and interpreting them mainly in terms of subsurface geology.

    Geophysical Method

  • 24

    It detect variations within the natural fields associated with the earth, like the gravitational and magnetic fields, such as gravity, magnetic, some electric and some electromagnetic methods, radioactive and geothermal methods

    Passive Method

  • 25

    These artificially generated signals transmitted into the ground and then modify the received signals in ways that are characteristic of the materials through which they travel. Examples of these methods are seismic and some electrical methods.

    Active Method

  • 26

    represent a set of geophysical methods which make use of the natural gravity field of the earth.

    Gravity Method

  • 27

    • It is mainly used for oil exploration. Sometimes in mineral and ground water prospecting.

    Gravity Method

  • 28

    involves the measurement of variations in the gravitational field of the earth (i.e. minute variations in the pull of gravity from rock within the first few miles of the earth’s surface).

    Gravity Prospecting

  • 29

    • Different types of rock have different densities and the denser rocks have the greater gravitational attraction.

    Gravity Method

  • 30

    • If the higher–density formations are arched upward in a structural high, such as an anticline, the earth’s gravitational field will be greater over the axis of the structure than along its flanks.

    Gravity Method

  • 31

    deals with variations in the magnetic field of the earth which are related to changes of structures or magnetic susceptibility in certain near surface rocks.

    Magnetic Method

  • 32

    are designed to map structure on or inside the basement rocks or to detect magnetic mineral directly.

    Magnetic Surveys

  • 33

    magnetic methods are employed for direct location of ores containing magnetic minerals such as magnetite.

    Mining Exploration

  • 34

    can often be distinguished on the basis of magnetic observations alone

    Intrusive Bodies

  • 35

    • This method is used to detect radioactive minerals such as uranium and thorium.

    Radioactive Method

  • 36

     Well logging method

    Radioactive Method

  • 37

    • This involves probing the earth with instruments which give continues readings recorded at the surface as they are lowered into boreholes.

    Radioactive Method

  • 38

    • The rock properties which are covered by well logging techniques are electrical resistivity, self potential, gamma ray generation density, magnetic susceptibility and acoustic velocity.

    Radioactive Method

  • 39

    is one of the most widely used of all geophysical techniques

    Well Logging

  • 40

    detect anomalies in the inductive properties of the earth’s subsurface rocks.

    Electromagnetic Method

  • 41

    • The method involves the propagation of time varying, low frequency electromagnetic fields in and over the earth.

    Electromagnetic Method

  • 42

    is introduced into the earth by induction from transmitting coils and the amplitude and phase shift of the induced potential generated in the subsurface are measured by detecting coils and recorded.

    Alternating Voltage

  • 43

    are used to detect metallic ore bodies.

    Electromagnetic Method

  • 44

    are the most commonly conducted geophysical surveys for engineering investigations. Seismic refraction provides engineers and geologists with the most basic of geologic data via simple procedures with common equipment.

    Seismic Method

  • 45

    may be a hammer striking the ground or an aluminum plate or weighted plank, drop weights of varying sizes, rifle shot, a harmonic oscillator, waterborne mechanisms, or explosives.

    Seismic Source

  • 46

    The sensor receiving seismic energy

    Geophone

  • 47

    • The resistively method is designed to give information about the electrical conductivity of the earth’s rocks.

    Electrical Method

  • 48

    • In resistivity method the current is driven through the ground using a pair of electrodes and the resulting distribution of the potential in the ground is mapped by using another pair of electrodes connected to a sensitive voltmeter.

    Electrical Method

  • 49

    • The resistivity method has been used to map boundaries between layers having different conductivities.

    Electrical Method

  • 50

    • It is employed in engineering geophysics to map bedrock.

    Electrical Method

  • 51

    • It is used in groundwater studies to determine salinity. – The induced polarization (IP) makes use ionic exchanges on the surfaces of metallic grains (disseminated sulphides).

    Electrical Method

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    問題一覧

  • 1

    It is the Exploration or Discovery of the ground conditions to enable engineers to make informed design.

    Site Investigation

  • 2

    Purposes/Importance of Site Investigation

    Suitability, Design, Construction, Effect Of Changes, Choice Of Site

  • 3

    - Determined by conducting extensive and intensive geological surveys

    Geological Structure Of The Area

  • 4

    - The relative position of the water table concerning the project must be thoroughly established

    Ground Water Conditions In The Region

  • 5

    - It includes the type of rocks that make up different parts of the area

    Lithology Of The Area

  • 6

    - This shows the interactions between humans and the physical environment.

    Seismicity Of The Region

  • 7

    - It is the collation and review of information's already available about the site

    Desk Study

  • 8

    - Preferred for complex projects, major engineering works, and heavy structures.

    Detailed Exploration

  • 9

    - The initial document search should be followed by walkover survey of the site and its surroundings

    Site Reconnaissance

  • 10

    - A sub-soil investigation or exploration report.

    Preparation Of Soil Investigation Report

  • 11

    - The main objective of preliminary site exploration is to obtain an appropriate picture of sub-soil conditions at a low cost. It is also called General Site Exploration.

    Preliminary Site Exploration

  • 12

    - It is a set of methods used in site investigation to provide information about the surface and subsurface geological conditions, without the need for excavation or drilling.

    Geological Method

  • 13

    Types Of Geological Method

    Surface Exploration, Subsurface Exploration

  • 14

    can include geologic mapping, geophysical methods, and photogrammetry, or it can be as simple as a geotechnical professional walking around on the site to observe the physical conditions at the site.

    Surface Exploration

  • 15

    - To obtain information about the soil conditions below the surface, some form of __________ is required.

    Subsurface Exploration

  • 16

    Geological Methods - Surface Exploration

    Aerial Surveys, Photogeology, Hydrogeological Surface

  • 17

    - The entire area involving an engineering study is photographed using sophisticated cameras and controls from low flying aeroplanes.

    Aerial Surveys

  • 18

    - Imageries obtained from satellite surveys and aerial surveys, when interpreted properly, provide useful details regarding rock outcrops on the surface with possibilities of estimating their subsurface configuration.

    Photogeology

  • 19

    - It is conducted partly on the surface with a view of recording the following details that are of immense help in the later studies

    Hydrogeological Surface

  • 20

    Geological Methods - Subsurface Exploration

    Direct Method, Indirect Method

  • 21

    - involve examination of rocks or materials of the underground by digging of drill holes, trial pits, adits, shafts, galleries and exploratory tunnels. In such explorations, both the underground areas are reached for direct examination and testing or samples are obtained which are examined and tested in the laboratory.

    Direct Method

  • 22

    - used extensively and involve application of geophysical techniques for obtaining fairly accurate idea of subsurface geology.

    Indirect Method

  • 23

    involve simple methods of study made on the surface with the aim of ascertaining subsurface detail. This is achieved by measuring certain physical properties and interpreting them mainly in terms of subsurface geology.

    Geophysical Method

  • 24

    It detect variations within the natural fields associated with the earth, like the gravitational and magnetic fields, such as gravity, magnetic, some electric and some electromagnetic methods, radioactive and geothermal methods

    Passive Method

  • 25

    These artificially generated signals transmitted into the ground and then modify the received signals in ways that are characteristic of the materials through which they travel. Examples of these methods are seismic and some electrical methods.

    Active Method

  • 26

    represent a set of geophysical methods which make use of the natural gravity field of the earth.

    Gravity Method

  • 27

    • It is mainly used for oil exploration. Sometimes in mineral and ground water prospecting.

    Gravity Method

  • 28

    involves the measurement of variations in the gravitational field of the earth (i.e. minute variations in the pull of gravity from rock within the first few miles of the earth’s surface).

    Gravity Prospecting

  • 29

    • Different types of rock have different densities and the denser rocks have the greater gravitational attraction.

    Gravity Method

  • 30

    • If the higher–density formations are arched upward in a structural high, such as an anticline, the earth’s gravitational field will be greater over the axis of the structure than along its flanks.

    Gravity Method

  • 31

    deals with variations in the magnetic field of the earth which are related to changes of structures or magnetic susceptibility in certain near surface rocks.

    Magnetic Method

  • 32

    are designed to map structure on or inside the basement rocks or to detect magnetic mineral directly.

    Magnetic Surveys

  • 33

    magnetic methods are employed for direct location of ores containing magnetic minerals such as magnetite.

    Mining Exploration

  • 34

    can often be distinguished on the basis of magnetic observations alone

    Intrusive Bodies

  • 35

    • This method is used to detect radioactive minerals such as uranium and thorium.

    Radioactive Method

  • 36

     Well logging method

    Radioactive Method

  • 37

    • This involves probing the earth with instruments which give continues readings recorded at the surface as they are lowered into boreholes.

    Radioactive Method

  • 38

    • The rock properties which are covered by well logging techniques are electrical resistivity, self potential, gamma ray generation density, magnetic susceptibility and acoustic velocity.

    Radioactive Method

  • 39

    is one of the most widely used of all geophysical techniques

    Well Logging

  • 40

    detect anomalies in the inductive properties of the earth’s subsurface rocks.

    Electromagnetic Method

  • 41

    • The method involves the propagation of time varying, low frequency electromagnetic fields in and over the earth.

    Electromagnetic Method

  • 42

    is introduced into the earth by induction from transmitting coils and the amplitude and phase shift of the induced potential generated in the subsurface are measured by detecting coils and recorded.

    Alternating Voltage

  • 43

    are used to detect metallic ore bodies.

    Electromagnetic Method

  • 44

    are the most commonly conducted geophysical surveys for engineering investigations. Seismic refraction provides engineers and geologists with the most basic of geologic data via simple procedures with common equipment.

    Seismic Method

  • 45

    may be a hammer striking the ground or an aluminum plate or weighted plank, drop weights of varying sizes, rifle shot, a harmonic oscillator, waterborne mechanisms, or explosives.

    Seismic Source

  • 46

    The sensor receiving seismic energy

    Geophone

  • 47

    • The resistively method is designed to give information about the electrical conductivity of the earth’s rocks.

    Electrical Method

  • 48

    • In resistivity method the current is driven through the ground using a pair of electrodes and the resulting distribution of the potential in the ground is mapped by using another pair of electrodes connected to a sensitive voltmeter.

    Electrical Method

  • 49

    • The resistivity method has been used to map boundaries between layers having different conductivities.

    Electrical Method

  • 50

    • It is employed in engineering geophysics to map bedrock.

    Electrical Method

  • 51

    • It is used in groundwater studies to determine salinity. – The induced polarization (IP) makes use ionic exchanges on the surfaces of metallic grains (disseminated sulphides).

    Electrical Method