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GeoExpert

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Étude géotechnique

LE BESOIN D'UNE ÉTUDE EN GÉOTECHNIQUE:


L’étude en géotechnique ou l’étude des sols est une étape primordiale, réalisée par un laboratoire en géotechnique, pour n’importe quel projet de construction en génie civil. Elle consiste essentiellement à caractériser le sol support (mort terrain et/ou massif rocheux) de site de la construction, évaluer la capacité du sol à supporter la structure et par conséquence optimiser le type et les dimensions de la fondation, s’assurer de la stabilité de terrain d’assise (essentiellement les terrains en pente) et vérifier le risque sismique de site. Plusieurs autres activités sont à réaliser selon l’envergure du projet de construction (tel que l’amélioration de sols, la stabilité des murs de soutènement, …)

EXPERTISE DE NOTRE ÉQUIPE :

Notre équipe est formée des ingénieurs en géotechnique (géotechniciens) avec des grandes expertises et expériences à travers de petits et grands projets. On essaie toujours de trouver la solution optimale qui assure la stabilité de l’ouvrage et qui minimise le coût de construction. Nos implications dans les études en géotechnique se résument comme suit :

TÉMOIGNAGES

site-investigation

Gina Gagnon, courriel, Lévis

Bonjour.  Votre professionnaliste et votre rapidité à donner suite à mes demandes m’épatent.  Ca contraste beaucoup avec mon service d’urbanisme.

Merci encore et bonne journée

Merci beaucoup pour votre aide 😊

Je vais regarder pour prendre une formation avec vous dans les mois à venir et je vais en parler avec des collègues à moi également

Bonne journée,

Bonjour. Merci pour tes corrections ! 

Excusez, j'ai quelques questions :

J'ai vérifié et effectivement la couche de sable silteux a le potentiel de liquéfaction.

Est-ce que je pourrais faire des recommandations pour que la dalle soit structurale ? ... liquéfiable ?

Merci,

  • What is the essential objective of a geotechnical study?
    Quite simply, a geotechnical study consists in characterizing the rigidity of the ground which will support a construction and in determining the characteristics of the foundations which will be the connection between the ground and the superstructure.
  • A geotechnical study is mandatory?
    Yes, the geotechnical study is mandatory in order to secure your house, chalet or building. In addition, it allows you to optimize the right variant for your foundation (type and dimensions) and avoid oversizing which generates a higher cost.
  • What are the steps of a geotechnical study?
    The geotechnical study can be summed up in three stages: Have more data on your site for construction/repair (location, previous or neighboring studies, surface deposit, investigations in the area) Prepare an investigation campaign (in situ tests, laboratory tests, water level measurement) Write a study report signed by a geotechnical engineer (characterization of soil deposit, foundation capacity, seismic/liquefaction risk, soil category, backfilling, temporary excavation, freezing depth, deep foundations/piles, improvement soils, structural slab, reaction modulus, slope stability, recommendations, ...)
  • How much does a geotechnical study cost?
    The cost of a study depends on the scope of your construction, the approach used to carry out the investigation campaign and the need sought (new construction, expansion, repairs, etc.). A geotechnical specialist is the only one who can estimate the cost of such a study.
  • What is meant by floor capacity?
    Soil capacity is the resistance of the soil to support your construction. To estimate this capacity, we need to know the nature of the soil (sand, clay, silt, gravel, ...) and the rigidity of this soil
  • What is the difference between soil study, soil capacity and geotechnical study?
    There isn't a big difference. But, generally a geotechnical study is broader. In addition to studying the soil and determining its capacity, we can check other aspects such as seismic risk...
  • How much does soil capacity determination cost?
    This soil capacity study is highly dependent on the data available and the scope of the project. For cottages and houses, it can range from $2,500 to $5,000.
  • Is it mandatory to know the rock level for a new construction?
    Not always mandatory. Generally it depends on the nature of your soil and the scope of the project. The geotechnical specialist is the only one who can judge whether or not it is necessary to find the rock level
  • What does a terrain/slope stability study consist of?
    The study consists of verifying the ability of the ground/embankment to remain stable and not suffer any slippage in the short and long term. The study is done in two stages (characterize the soil of the field/talus, then study the stability using conservative formulas or software)
  • What to do in the event of a landslide?
    Call a geotechnical specialist to carry out some diagnosis of this event and determine the causes of this slide. Then, the specialist will propose stabilization solutions following a complete stability study
  • What are the causes of landslides/embankments?
    Several causes can cause this shift: Low resistance of the material constituting the embankment (to be validated after investigation tests of the rigidity of the ground) Addition of a permanent overload on the crest of the terrain/talus Passage of a temporary load on the crest (machine, vehicle, ...) Excavation at the foot of the embankment (ex: a neighbor has built at the bottom of your land) Natural disaster (heavy rain, flood, earthquake, ...) The geotechnical specialist is the only one who can determine the main cause(s) of this slide
  • What are land/slope stabilization solutions?
    Several solutions exist and depend on the size of the land/embankment, the accessibility for stabilization work machinery and the customer's budget. We can find earthworks solutions such as reprofiling, leveling, a stop at the foot of the slope and reinforcement solutions such as anchoring rods. The geotechnical specialist is the only one to offer the right solution after a complete study of the terrain/slope stability
  • What is the cost of a ground stability study?
    The cost depends on several factors (scope of the project, knowledge or not of the nature and/or parameters of the soil, current state of the embankment and its history of slippage). Generally, such a study varies between $2,000 and $7,000. The geotechnical specialist is the only one who can estimate the exact cost of such a study
  • Is it mandatory to do a seismic study?
    Yes, it is mandatory to check the risk of soil liquefaction at your construction site. A conservative study is carried out first. In case of risk, a more advanced study is recommended. Solutions to reduce the risk exist. Such a study starts from $3000
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