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Work areas

SERVICES
Geotechnics

GEOMA performs all kind of geotechnical studies that lead to the characterization of the subsoil materials, in order to assess their resistance and deformability.

This information provides the designer of any type of structure (houses, buildings, bridges, slopes, roads,....) the confidence needed in order to project the best possible solution considering the geotechnical features of the terrain existing underneath the task.

All the studies performed by GEOMA comply with the Spanish regulations and standards relative to building (LOE and CTE), ports (ROM), roads (PG3) or photovoltaic plants (internal standards).

GEOMA makes geotechnical reports for building projects: single-family, multi-family, singular buildings, public buildings, sport centres, educational centres, shopping centers, industrial buildings and warehouses, ... and for civil engineering projects: linear works, ports, airports, wastewater treatment plants, urban solid waste deposits.

In our studies the materials are identified, their aggressiveness to concrete is assessed, the risk of expansiveness, their resistance and deformability, their hydrogeological and seismic characteristics, in order to be able to recommend an acceptable working load (foundations) or evaluate their stability (slopes and walls). Additionally, we study he risk of flooding, the influence of the phreatic water level and the risk of collapse due to the presence of cavities.

For these studies, GEOMA workers use the following tools:

  • Geotechnical drilling rigs: the drilling rigs allow the drilling of great depths in the ground and the collection of samples (both disturbed and undisturbed) that can later be tested in the laboratory. All of the machines have the equipment to perform resistance testing: standard penetration tests (SPT) or dynamic probing super heavy tests (DPSH), which allow an assessment of the resistance and deformability of the drilled materials.
    Our machines have small size and high power, and have tracks to be autonomous, which makes them very versatile for any type of work.

  • DPM 30-20 penetrometer: the DPM 30-20 penetrometer allows the performance of light type penetration tests, ideal to study loose soils and man-made fillings, with the capability to continuously characterize the resistance in depth.
  • Sclerometer or Schmidt hammer: the sclerometer is a small device that is used to assess the resistance of rocks and concretes. It allows us to assess the resistance of the rock matrix, necessary for a correct geomechanical characterization of the rock.

At GEOMA we know that the design of the optimal foundation for any structure requires a successful recognition of the subsoil.
Our goal is to add value to the project.
Geophysical prospecting

GEOMA has teams and technicians specialised in geophysical prospecting.

Geophysical prospecting methods are based on the measurement, from the surface, of some physical property of subsoil materials. The physical property used will depend on the objectives of the survey campaign.

The electrical resistivity method is usually used on the study of cavities in the subsoil. It is based on the measurement of the resistance that different materials offer to the passage of an electrical current (electrical resistivity). This method is ideal for the detection of cavities (these represent areas of high resistivity, in contrast to the surrounding materials).

The electrical resistivity method also helps to know the distribution of subsoil materials, which is very useful when trying to define the distribution of man-made grounds, or to find a rocky substrate at depth.

The vertical electrical soundings (V.E.S.) are used to search for water and to take resistivity measurements at a certain point (ground connection in photovoltaic plants). This method allows to reach depths up to 250 m.

Finally, the georadar is very useful on the detection of buried pipelines and structures. It is based on the emission of a radio wave and the measurement of its response.
Hydrogeology
 

Water is a key issue in the evaluation, exploitation and management of the resources of an area or region. It makes it very important to have a clear and accurate knowledge of existing aquifers. GEOMA provides this knowledge throughout the performance og geological mapping, water points records, geophysical studies for groundwater prospecting, pumping tests and monitoring of wells. The information obtained is materialised in a hydrogeological report. This information is often required by the administration in preliminary project phases for the execution of infiltration and extraction wells, and certain installations for public use, among others.

The knowledge of the surface materials (geological mapping) provides the geologist with essential information when trying to know the nature of the subsoil materials, their distribution and their hydrogeological characteristics (porosity, permeability, transmissivity). It ultimately helps to evaluate the viability of water wells at certain sites.

The inventories of water points provide information about the possible aquifers to be exploited, the depth of the boreholes, the potential extraction flow and, sometimes, the quality of the water. They also indicate probabilities of success and problems that may be encountered during the drilling and exploitation of a well.

Geophysical prospecting provides information on the materials beneath a point, down to a depth of more than 250 m. This allows the spatial modelling of the geological conditions of the borehole and the aquifers present in the studied area.

In order to know the yield of a well, the depth of the pump and the effect on the aquifer, pumping tests are carried out. The behaviour of the well is studied by taking it to a limit extraction situation, and then proceeds with a recovery test, in which its whole performance is evaluated. In addition, several water samples are taken during the test in order to determine the chemical composition of the water.

In those wells where it is desired to certify its correct execution (recently drilled boreholes) or in those where it is desired to study their condition (old wells), it is desirable to perform monitoring. This consists of the introduction of an underwater camera inside the well, in order to directly observe the state of the walls of the well.

GEOMA accomplishes:

  • Feasibility studies and design of pumping in excavations below the water table.
  • Feasibility studies for the installation of geothermal systems.
  • Search for suitable sites for the location of groundwater collection wells using cartographic and geophysical techniques.

  • Applications for official permits in new groundwater abstraction and/or infiltration wells.
  • Video recording of the interior of boreholes or wells.
  • Construction and control of piezometers.
  • Pumping or infiltration tests.
  • Inventories of water points.
Environmental geology

The progressive environmental awareness of society, which demands measures for the conservation and protection of the natural environment, has generated the need for a better understanding of our surroundings and their effects of human activities.

GEOMA produces Environmental Impact Assessments, Restoration Projects, Land Management studies, soil and aquifer contamination studies, Marine Intrusion Assessment and landfill sitting, having also worked within certain fields with highly specialised companies in the environmental sector.

An Environmental Impact Assessment (EIA), basically consists of an environmental inventory, which includes all the elements present in the environment under study (atmosphere, land, water, vegetation, fauna, landscape, socio-economic environment and cultural heritage), a list of the project actions that likely may generate an impact on that environment, an assessment of the impacts that will be generated and, finally, the proposal of protective and corrective measures to minimise those impacts.

In those areas where the natural environment has been deteriorated by human activity and which are to be recovered for later enjoyment, a Restoration Plan is necessary. In this plan, the existing conditions must be carefully studied in order to, by means of modifications to the geomorphology and vegetation, achieve an approximation to the conditions that existed in the area before the start of the activity.

In order to be able to manage a territory, the competent bodies need to know the existing resources (hydrology and hydrogeology, mining, quarrying, fauna, vegetation, cultural heritage, ...) and its uses. To this end, territorial management studies are drawn up, which constitute of cartographies of the different elements of the environment (land, water and biotic environment).

A fundamental part of the Marine Intrusion Assessment is the geophysical survey. This is an in situ, non-destructive (no drilling) and indirect method (it uses the physical properties of the materials). Throughout this method, it is possible to know the volume affected by pollution and to monitor its evolution over time.

Studies are currently being carried out on the most appropriate choice of landfill sites in order to minimise the risk of contamination. This starts with a geological-geotechnical cartography that covers the entire area to be studied, and finally a detailed study of the site terrain is performed.

Soil contamination studies are also undertaken, and provide technical support in legal compliance: compliance with RD 9/2005 on contaminated soils. Preventive control networks, environmental services in the transfer of properties and environmental assessment of sites.
Topography

In any construction project it is necessary to have a good topographical base that serves to locate any element and its evolution throughout the phases of the project: beginning, development and end.

GEOMA and its team of topographers provide this knowledge with the precision requested by the client, taking into account the objectives pursued with the topography campaign. Thus, a demarcation of a plot of land (where the important thing is to delimit its shape in 2D), the volume of a cavity (where it is sufficient to define its shape in 3D) is not the same as a topographic survey of a service station or the initial state of a plot of land intended for housing (where any piping or vegetation must appear).

Geologia de Mallorca S.L.

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