AVZ GeoEngLtd

Drilling, Site Investigation, Reports

8 Tanyard Avenue, East Grinstead, 

         West Sussex, RH19 4LU

         01342 457117

mob: +44(0) 788 5977732

email: info@avzgeoeng.co.uk

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AVZGeoEng offer a wide variety of test types which may be performed within boreholes and installations, and as standalone activities on the surface and intrusively.

All the in-situ testing detailed below is carried out in-accordance with BS 1377: Part 9 and the Eurocode Part 2, Ground Investigation and Testing (published  2007).

Tel: 01342 457117:    Fax: 01342 457117   Email: info@avzgeoeng.co.uk

Company Reg 7824020

In-situ testing and monitoring

SPT (Standard Penetration Test) is is an in-situ test that is coming under the category of penetrometer tests. The standard penetration tests are carried out in borehole. The test will measure the resistance of the soil strata to the penetration undergone. The test results are deduced through the number of blows needed to drive the tube each 75mm into the ground, to a maximum depth of 450mm. The “standard penetration resistance” or “N-value” is calculated by the sum of the number of blows required for the last four 75mm increments of penetration, to a maximum of 50 blows. The test is extremely useful for determining the relative density and the angle of shearing resistance of cohesionless soils. It can also be used to determine the unconfined compressive strength of cohesive soils.

Insitu California Bearing Ratio (CBR) Test is carried out for clients who require information relating to sub base materials when undertaking projects such as road and pavement design or many other design projects such as parking / loading areas or temporary foundations.  The California Bearing Ratio(CBR) test is a measure of resistance of a material to penetration of standard plunger under controlled density and moisture conditions. It was developed by the California Division of Highways as a method of classifying and evaluating soil- subgrade and base course materials for flexible pavements.

 

Alternatively a profile of equivalent CBR can be measured using the Dynamic Cone Penetrometer (DCP) or Clegg Hammer Testing.

 

Plate Load Testing is particularly suited for the design of foundations or footings for buildings where it is considered that the mass characteristics of the soil would differ significantly from the results of laboratory tests, or where more precise values of settlement are required. These can also be used in verifying bearing capacity for crane and pile pads, deriving soil stiffness parameters and CBR values.

Mackintosh Probe is a lightweight and portable penetrometer. It is a considerably faster and cheaper tool than boring equipment especially when the depth of exploration is moderate and the soils under investigation are soft or loose. Correlations are developed between Mackintosh Probe results and those of the Standard Penetration Test (SPT), as well as, undrained shear strength (cu).

Groundwater and Gas Monitoring

Groundwater monitoring generally comprises the measurement of water levels and the recovery of water samples for laboratory analysis.

 

Gas monitoring is undertaken to determine the levels of methane, carbon dioxide, oxygen and other gases which can be generated by made ground or backfilled materials. The gas flow within the borehole is dependent on the atmospheric pressure at the time the readings are taken.

Permeability Testing

Variable (falling and rising) head tests can be undertaken in boreholes or through standpipes / piezometers.

Packer permeability testing can be undertaken in boreholes using pneumatic packers.

 

Soakaway (infiltration) tests in Trial Pits or boreholes can also be undertaken in accordance with BRE Digest 365. It should be noted that all permeability testing is time dependant and suitable allowance provided for testing in low permeability soils and rocks.

 

Our preferred method on carrying out Infiltration/Sokaway test is by drilling shallow borehole (usually 150mm) installed with temporary screen pipe (115mm) to facilitate the tests. The method does not require large amounts of water for the tests and less intrusive compared to the traditional trial pit tests.  

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