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CivilSoil Mechanics
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The general exploration gives information about which of the following features?

A

Depth of rock

B

Composition of soil strata

C

Ground water level

D

All of the mentioned

Correct Answer

тЪЩя╕П TE тАв Technical Concept & PrincipleCivilSoil Mechanics
Option D

All of the mentioned

Quick Summary:

General exploration (or preliminary site investigation) is the initial phase of soil investigation aimed at determining the broad geological and geotechnical features of a site. It provides essential data regarding the stratification of soil, depth to bedrock, and the location of the water table, which are critical for the preliminary design of foundations.

тЪЩя╕ПTETechnical SolutionConcept & Principle
ЁЯТб Explanation

General exploration (or preliminary site investigation) is the initial phase of soil investigation aimed at determining the broad geological and geotechnical features of a site. It provides essential data regarding the stratification of soil, depth to bedrock, and the location of the water table, which are critical for the preliminary design of foundations.

ЁЯФв Key Formulas

dc=12qu╬│d_c = \frac{1}{2} \sqrt{\frac{q_u}{\gamma}}dcтАЛ=21тАЛ╬│quтАЛтАЛтАЛ тАФ Empirical approximation for preliminary investigation depth in specific strata

тЪЩя╕П Working Principle

The process involves conducting a reconnaissance survey, studying existing geological maps, and performing simple field tests like wash borings or geophysical methods (seismic refraction/electrical resistivity). These techniques identify the spatial variability of soil layers and detect anomalies, allowing engineers to decide the depth and type of detailed boring required for the final design.

ЁЯУМ Key Points
  • тЦ╕

    General exploration is conducted before detailed subsurface investigation.

  • тЦ╕

    It helps in selecting the method of boring and the number of boreholes.

  • тЦ╕

    It assists in identifying potential hazards like sinkholes, high water tables, or boulders.

  • тЦ╕

    The scope is typically limited to a rapid assessment of site feasibility.

тЬЕ Advantages
  • тЦ╕

    Reduces the risk of encountering unexpected ground conditions.

  • тЦ╕

    Cost-effective for preliminary design phases.

тЭМ Disadvantages / Limitations
  • тЦ╕

    Does not provide detailed soil strength parameters.

  • тЦ╕

    Limited accuracy in highly heterogeneous ground conditions.

ЁЯЫая╕П Applications / Uses
  • тЦ╕

    Foundation site selection

  • тЦ╕

    Preliminary bridge alignment studies

  • тЦ╕

    Dam site feasibility assessment

ЁЯУД Additional Information
  • тЦ╕

    Standard procedure follows IS 1892 for subsurface investigation in India.

  • тЦ╕

    General exploration is often supplemented by geophysical methods to reduce drilling costs.

ЁЯУК Diagram / Illustration
General Exploration FeaturesSoil StrataDepth of RockGround WaterSite SuitabilityAnalysis
тЬЕ

D is correct тАФ General exploration aims to map the overall geological and hydrological characteristics of a site, encompassing soil strata, rock depth, and groundwater levels.

Core Concepts Used
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Soil Exploration Geotechnical Site Characterization Hydrology and Stratigraphy
ЁЯТб EXAM TIP

Always remember that in Civil Engineering, site investigation is a hierarchical process starting from general reconnaissance and moving toward detailed field and laboratory testing.

Related Questions

CivilSoil Mechanics
The method used for studying of horizontal changes in the sub-soil is _______
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Electrical resistivity method is based on measurement of _____________
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The commonly used geophysical method for site exploration is ________
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The type of boring method that can be used for both rock and soils are ________
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The Instruments used in hand augers are _________

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