We believe that a quality work begins at the base. Since 1979, we have been providing foundations and earthworks consultancy, geotechnical and geo-environmental site investigations, geotechnical instrumentation and soil laboratory tests.

Damasco Penna

+
10/12/2018(Português do Brasil) Congressos, cursos e feiras no exterior

Site Investigation


  • PIEZOCONE TESTS (CPTU)
  • DILATOMETRIC TESTS (DMT)
  • VANE TESTS (VST)
  • PRESSUREMETER TESTS (PMT)
  • ROTARY DRILLING AND SPT SOUNDING
  • SOIL SAMPLING
  • GEOTECHNICAL INSTRUMENTATION
  • ENVIRONMENTAL SOUNDINGS
  • LABORATORY TESTS

PIEZOCONE TESTS (CPTU)
 

CPT-u (Cone Penetration Testing) is an in-situ test used to obtain data on several soil aspects. Well known worldwide as one of the most traditional and precise geotechnical investigation tool, it enables determining foundation dimensions and estimating settlement rates, among other operations.

While the cone is being driven down, its sensors make three readings at each centimeter:

  • Tip resistance (qc)
  • Sleeve friction (fs) (fs)
  • Pore pressure (u2))

The information is transmitted to the surface in real time and processed by computer.

Excess pore water pressure are read by means of a porous element situated at the base of the cone and saturated with silicone oil by vacuum pump. When needed, it is also possible to perform pore pressure dissipation testing during the test.

In addition to the data read in real time during the test (qc, fs and u2), the following properties can also be obtained through correlations:

  • Stratigraphy;
  • Geotechnical profile (Soil behavior);
  • Consolidation coefficient (Ch and Cv);
  • Relative density (Dr);
  • Undrained shear strenght (Su);
  • Effective friction angle of sands (Ø);
  • Stress history (preconsolidation stress, OCR);
  • Permeability coefficient (K).

ensaio-cptu
Piezocone equipment


Saturation vacuum pump




 

See also posts about Piezocone Tests:
 
Dissipation Tests
 
Nearshore tests
 

DILATOMETRIC TESTS (DMT and SDMT)

 

Used worldwide since 1975, DMT (Dilatometric Marchetti Test) is one of the most precise tools for in situ testing to determine settling and estimate the elasticity module (E) of prospected soil layers. Quick and simple to perform and applicable to almost any kind of soil, the test is regulated bylo Eurocode 7 and ASTM D6635 – 01(2007) Standard Test Method for Performing the Flat Plate Dilatometer.

 

The DMT test consists in a stainless steel blade with a thin circular expandable pushed into the ground. At every 0,2m pressure is applied to inflate the membrane. Electrical sensors provide the measures “A” and “B”.

 

The dilatometer blade can be advanced using a conventional CPT pusher and being an “in-situ” test, can obtain measures at several places in the same site and in different depths.

 

 

VANE TESTS (VST)

 

The Vane Tests consists of four rectangular blades that are pushed into the ground to the desired depth. Once the depth is reached, the blades are rotated in a standard, constant speed.

The resistance of the soil increases until the soil shears, and these readings provide the undrained shear strenght. This test is standardized by ASTM-D2573 and NBR-10905 (in Brazil).

 

 

RESULTS

 

With the vane readings it is possible to obtain:

    • The torque x rotation graphico
    • Undrained shear strenght (Su)
    • Remolded shear strenght
    • Soil sensitivity

 

 

Icone Vane Test

 

 

 

 

VANE - EXEMPLO 1 Vane Test results

 

 

 
PRESSUREMETER TESTS (PMT)
 
Developed in France in the 1950s by engineer Louis Ménard, the Ménard-type pressuremeter tests (PMT) consist of inserting a pressuremeter probe into a borehole and then applying nitrogen gas to deform a flexible membrane.
Deformation measurements are read by a control panel that measures pressure and volume variations occurring as a result of soil deformation.
 
A strain x strain curve of the prospected soil is obtained, providing the following information:

  • Ménard pressiometric module
  • Ménard limit pressure;
  • Residual pressure.

These results allow us to evaluate the following parameters through correlations:

  • Soil modulus (E);
  • Undrained resistance of saturated clayey soils (Su);
  • Drained resistance of sandy soils (ø);
  • Load capacity and rebounding in deep and shallow foundations

dsc_5124-300x199

 
 
pressiometro-menard-geospad3-300x199

 

The tests are performed in accordance to ASTM D4719 –Standard Test Method for Prebored Pressuremeter Testing in Soils and Eurocode 7.
ensaio-pressiometro

SPT SOUNDINGS (SPT)
 
The SPT Soundings (SPT) are widely used in Brazil being the most common technique for site investigation in this country. The SPT tests allows a good initial site comprehension, indicating the water level, soil types and SPT resistance.
 
MECHANICAL SPT SOUNDINGS
 
Our company can perform mechanical SPT soundings with drill rigs such as CME-550, CME-55 and Geoprobe 7822, all of them equipped with automated SPT hammer and hollow auger drilling capability.

 

ROCK CORING
 
Damasco Penna´s drill rigs can perform rotary drilling and coring drill for engineering and geo-environmental purposes.

 

 


Sounding report

 

SOIL SAMPLING

Our company offer diverse possibilities regarding soil sampling. Depending on the kind of soil, depth, soil resistance and other variables.

Below we indicate some of the sampling techniques that can be performed. Please contact our team to know more about sampling possibilities.

SHELBY SAMPLING

Shelby samplings are commonly used to sample fine grained soil, especially very soft and soft clays, as estabilished by ASTM D1587 – 08 Standard Practice for Thin-Walled Tube Sampling of Soils for Geotechnical Purposes.

The method consists in mechanically drilling until the desired depth using "hollow stem augers" and internal rods that ensures the complete casing of the borehole prior to sampling. Once the desired depth is reached, the sampler is inserted statically., collecting the sample. Depending on the kind of soil, especially when grained a "piston sampler" can be used.

 

 

Piston Sampler detail

 

 

DENISON SAMPLER

Denison Samplers are used to collect undisturbed samples in more resistant soils that would not be able to be collected using Shelby Samples.

The sample is made with a rotary drill rig and a set of tubes and casings.

 

 

Denison Sampler detail

 

 

"CONTINUOUS CUTTING SAMPLER”

This sampler was developed by  Damasco Penna aiming to collect semi-disturbed samples in compacted fills where tradicional sampling could not be applied.

 

The samples are collected with dinamic penetration of a metalic sampler with an internal PVC tube with 3" diameter . The samples can be used to diverse laboratory tests allowing diverse laboratory tests and understanting of the compaction degree of deep soil layers.

 

 

"Continuous cutting" sampler

 

 

GEOTECHNICAL INSTRUMENTATION

 

The geotechnical instrumentation services aim monitoring and recording deformations, pressures and displacements of geotechnical works and infrastructure, through the installation of sensors, inclinometers, surface landmarks, piezometers, among others.

 

As Damasco Penna has its own drill rig fleet, we are able to install instruments in different types of terrain as well as specialized technicians in the reading and monitoring of instrumented sites.

 

We use GEOKON , a renowned North American manufacturer with over 40 years of manufacturing experience. sensors and instrumentation equipment. Consult our team for instrument information and reading automation.

 

 

 

ENVIRONMENTAL SITE INVESTIGATION

 

The geo-environmental site investigations make it possible to determine the existence of contaminants in soil and groundwater. Damasco Penna provides services such as installation of monitoring wells, soil and water sampling for environmental purposes.
 
This type of service requires using clean and properly decontaminated tools and equipment, ensuring reliable sampling and avoiding cross-contamination.
 
We provide our clients with a drill rig fleet able to install monitoring and remediation wells with more than 100m depth in soil and rock, as well as soil and water sampling by the "direct push" method in different types of sites and diverse geological formations.
 
sondagens-ambientais-1
Geo-environmental site investigation with the Geoprobe 6625CPT

 

AMBIENTAL LINER 1
Soil sampling acrylic liners

 

 

LABORATORY TESTS
 

Damasco Penna counts on diverse soil laboratory equipment and teams, being able to perform in-situ soil characterization as well as laboratory soil characterization.

 

Our equipment has a rigorous schedule of maintenance and calibrations and our teams are able to perform tests such as:

 

    • Water content
    • Bulk density
    • Liquid limit anda plastic limit
    • Grain size analysis (sieve analysis and sedimentation annalysis)
    • Specific gravity of soil particles
    • Standard Proctor compaction
    • Modified Proctor compaction
    • California Bearing Ratio

 

Controle de compactação de aterros com ensaios Hilf:

 

Geotechnical Consulting

Damasco Penna, Inc. provides site investigation and foundations consultancy services for diverse industry sectors

+

Our equipments

+

Health and Safety

Protecting our workforce and general public is our main value and a routine in all our activities.

+

Videos

Piezocone Tests (CPTU)
Direct Push soil sampling
Lugeon Tests
Marchetti Dilatometric Tests (DMT)
SPT Sounding (automatic drop hammer)
Rock Coring / SPT Soundings
{"popup_fix":"true"}

Downloads

+

Contact

SÃO PAULO

Alameda Rio Negro, 1105 – 1º andar – cj. 11
Alphaville – SP – Brasil
Phone: +55 11 4195-8385 damasco@damascopenna.com.br