India's best Engineering Geophysics service provider - Parsan

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Engineering Geophysics
www.parsan.biz
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Engineering Geophysics
Any major construction work like power plants,
high rise buildings, bridges etc., calls for a
well-considered approach in view of the
restricted timeframe and finance. In planning and
development of project adequate knowledge of the
subsurface conditions at site is critical.
Application of tools and techniques that are
helpful in enhancing efficiency of the
geotechnical evaluation study is therefore
preferable.
Engineering geophysics is an efficient means of
subsurface investigation. The merit of
application of this low cost aid lies in its ease
of deployment and rapidity in providing a
reliable knowledge of the underground over a
large area, substantiating the requisite
geotechnical evaluation studies thereby.
Technological advancements and development of
portable digital data acquisition instrument
systems have increased the versatility in
evaluating underground conditions and site
characterization.
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The state-of-the-art subsurface geophysical
investigations are helpful towards minimizing
involvement of the conventional direct
exploration methods, aiding in accelerated and
economical development of the construction
projects
It is an established fact that a single
geophysical method cannot resolve all the
problems associated with subsurface
investigations. As an example, seismic refraction
cannot see low velocity zones under rock
interface, which might be present under certain
geological conditions. PARSAN therefore believes
in integrated application of various geophysical
techniques like seismic refraction, resistivity
imaging, ReMi, Crosshole/downhole/uphole seismic
and seismic reflection, to determine various
properties of subsurface like bedrock quality and
depth, low velocity zones (even under rock
interface), fault/fracture/shear zones, water
lenses, tunnel route geology etc. PARSAN also has
extensive experience of utility detection which
is at times required at urban sites.
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Some of the Unique Advantages of Geophysical
Survey

• Geophysical methods are quick to apply, saving
  in terms of time and money

• Light and portable equipment allows access to
  remotest of sites.

• Provides information on critical geological
  features like faults/fractures/weak zones/shear
  zones, not visible from surface information.

• Large areas mapped quickly and inexpensively.

• Researchers can assess site conditions, and
  target specific locations for detailed
  investigations by drilling, while avoiding others

• Geophysical methods can quickly produce
  subsurface geology avoiding delays during
  execution due to meeting the unexpected

• Shear wave profiles can be quickly obtained for
  ascertaining liquefaction potential and
• earthquake response.

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PARSAN has highly experienced personnel and
advanced instruments to carry out high resolution
geophysical surveys for geotechnical
investigations. The survey methodology and tools
to be used are decided in consultation with the
client and depending on site conditions and
objectives of survey. A technical report
describing our work, including high resolution
maps with detailed interpretation is presented to
the client upon completion of analysis.
Techniques available to solve a range of
subsurface problems for geotechnical
investigations
1. Seismic Refraction

• Bedrock profile, rock quality and depth

• Topography of ground water

• Thickness of overburden

• Slope stability studies

• Fractures and weak zones

• Pipeline route studies

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2. Electrical Resistivity Imaging

• Bedrock quality and depth measurements

• Excellent 2-dimensional display of ground
  resistivity.

• Fractures and weak zones

• Delineation of small features like cavity,
  contamination plumes, weak zones etc.

• Detects soft zones under rock surface (not
  detected by seismic refraction)

• Possible to conduct across flowing rivers for
  bedrock depth determination

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3. ReMi (Refraction Micro-tremor)

• PARSAN has launched for the first time in India,
  innovative technique of ReMi (Refraction
  Micro-tremor) having distinct edge over MASW and
  SASW in terms of logistics, execution and results.

• ReMi can be performed under the same layout as
  used for seismic refraction, to obtain excellent
  shear wave velocity profiles of subsurface.

• The seismic source consists of ambient seismic
  "noise", or micro-tremors, which are constantly
  being generated by cultural and natural noise.

• ReMi can determine shear wave velocities down to
  a minimum of 40 meters (130 feet) and a maximum
  of 100 meters (300 feet) depth

• Critical parameter for earthquake site response
  and Liquefaction analysis.

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4. Crosshole/downhole/uphole Seismic Surveys

• Precise determination of P and S wave seismic
  velocities.

• Determination of Dynamic Elastic Moduli like
  Poissons Ration, Youngs Modulus, Bulk Modulus
  and Shear Modulus.

• Detects even thin anomalous zones in subsurface.

5. Ground Penetrating Radar

• Geological and hydro-geological investigations
  including mapping of bedrock topography, water
  levels, solution features, glacial structures,
  soils and aggregates.

• Engineering investigations to evaluate dams, sea
  walls, tunnels, pavements, roadbeds, railway
  embankments, piles, bridge decks, river scour,
  buildings and monuments.

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• Location and evaluation of buried structures
  including utilities, foundations, reinforcing
  bars, cavities, tombs, archaeological artifacts,
  and animal burrows.

• Site investigations location of buried
  engineering structures and underground storage
  tanks.

• Rapid ground coverage- Antenna towed either by
  hand or from a vehicle.

• High-resolution coverage of the survey area,
  detecting even small objects.

• On-site interpretation possible due to instant
  graphic display.

6. Micro Gravity Surveys
Regional geological mapping
Sediment thickness studies

• Void detection

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91-11-41606500 91-9811168288 91-11-46542680
707, Eros Apartments,56-Nehru PlaceNew
Delhi ( INDIA) 110019
info_at_parsan.biz
www.parsan.biz