+30 210 27 09 600 edafo@edafomichaniki.gr

In-Situ Testing

As part of its comprehensive range of site investigation services the Edafomichaniki SA Group can carry out a wide range of in-situ drilling with testing and sampling, making use of a wide range of in-house resources including: Soil Mechanics, Rock Mechanics, In-borehole Testing, Concrete

Soil mechanics

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Plate Load Test (Strassentest Type)

  • Ε 106- 86
  • ASTM D 1194 – 72
  • ASTM D 1195 – 64
  • DIN 18134
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Density in Place by Sand Cone method

  • Ε 106- 86
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Density in Place by Nuclear method (Troxler device)

  • ASTM D2922-81
  • DIN 18125
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Subsoil Monitoring Using Inclinometers

  • ASTM D4622 – 86
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Pile Loading Test (vertical load)

  • Ε 106- 86
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Anchor Pull out Test

  • DIN 4014

Rock Mechanics

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In Situ direct shear test of discontinuity

  • Ε 102 – 84
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Large Plate Load Test

  • Ε 102 – 84
  • ASTM D4395
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Convergence Measurement in audits with Invar

  • Ε 102 – 84
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Deformability Measurement with Extensometers

  • ASTM D4403
  • ISRM DOC. 5/1997

In-borehole Testing

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Standard Penetration Tests (EN ISO 22476-3/2004)

This type of test is performed during drilling of the borehole and records the resistance to penetration of a standard split-spoon cylindrical samples pushed in the ground from the bottom of the borehole by blows. The recorded N value is the number of blows necessary to achieve penetration for 45cm by a hammer of weight 63,5kg falling from 76,2cm in three successive steps of 15cm each.
The test is widely used to determine in-situ properties of the subsoil and indicatively:

  • the relative density of soil formations
  • the resistance to penetration of the soil formations
  • the shear resistance parameters and indirectly the compressibility parameters of soil formations (by semi-empirical correlations)
  • the determination of the foundation bearing capacity and settlements
  • the determination of piles bearing capacity
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Field Vane Tests (EN ISO 22476-9/2007)

This type of test is performed during drilling and monitors the undrained shear resistance of the subsoil, mainly on soft to stiff clays. Within the drilled hole, a rectangular vane consisting of four plates fixed at 90o to each other is intruded by push in the soil layers, followed by rotation of the metal column and the vane. Records of the monitored torque till failure allow the determination of the undrained shear strength of the subsoil formation.

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Site Permeability Tests of type Maag - Lefranc (EN ISO 22282-2/2008)

Site measurement of subsoil permeability is mainly performed within a borehole by recording the variation of the water level through variable, falling head tests (Maag) or constant head tests (Lefranc). These tests are applicable in soil-type formations. During the Maag type test, the borehole is completely filled up and the rate of decreasing water level is monitored. During the Lefranc type test, the filled-up borehole is kept constant and the water supply rate is recorded to assume for a steady – constant water level.
Based on those records, the permeability coefficient is obtained.

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Site Permeability Tests of type Lugeon - Packer Test (EN ISO 22282-3/2008)

Within rocky formations, permeability tests of Lugeon type are performed to determine the permeability coefficient of the rock-mass and its discontinuities. During this test type, the absorbed water supply within the tested part of borehole is recorded at various pressure steps in both increasing and decreasing order in relation with time. Based on those records, the rock mass permeability coefficient is obtained.

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Pumping Tests

The aim of Pumping tests is to identify the hydraulic parameters of the aquifers (k: permeability coefficient, T: transmissitivity coefficient, S: storage coefficient) (“aquifer test”). During pumping tests, water is pumped from a well and water level drowdown is measured in the well and in nearby observation points (wells, piezometers). Pumping tests also provide information about the well (“well tests”). Aquifer tests are used to solve problems about the flow of underground water, the yield of aquifers, the transport of pollutants e.t.c. Well tests are used to calculate specific yield of wells, to check well construction quality and development by calculating the linear and nonlinear load losses, the estimated cost of pumping groundwater etc.

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Soakaway tests (BRE Digest 365)

These field tests are performed in accordance with BRE Digest 365 (Soakaway Design Recommendations) of part H3 of approved document H “Drainage and waste disposal” of the Buildings Regulations 2000, to obtain soil infiltration rates for soakaway design.
The test is simulating water flowing out of the soakaway and into the ground using a special test pit or water – borehole in order to determine a value for the infiltration characteristics of the soil. The infiltration rate is calculated from the time taken for the water level to fall from 75% to 25% effective storage depth in the pit.

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Pressuremeter Tests (EN ISO 2247-4/2009)

These field tests are performed in accordance with BRE Digest 365 (Soakaway Design Recommendations) of part H3 of approved document H “Drainage and waste disposal” of the Buildings Regulations 2000, to obtain soil infiltration rates for soakaway design.
The test is simulating water flowing out of the soakaway and into the ground using a special test pit or water – borehole in order to determine a value for the infiltration characteristics of the soil. The infiltration rate is calculated from the time taken for the water level to fall from 75% to 25% effective storage depth in the pit.

Concrete

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Standard test Method for Rebound Number of Hardened Concrete using Schmidt Hammer

  • ASTM C805
  • DIN 4240
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Determination of strength of concrete with stud driving method

  • TH. TASSIOS
  • K. DEMIRIS
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Standard test Method for Pulse Velocity Through Concrete

  • ASTM C597
  • BS 4408
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Determination of the exact location and size of reinforcement bars inside the concrete as well as concrete coverage with Micro Covermeter device

  • Magnetic
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Determination of Concrete Carbonation using Phenolphthalein indicator

  • Empirical chemical test
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Performance of investigation sections to determine reinforcement in beams and columns (diameter, number)

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