What Is a Geotechnical Investigation?

Geotechnical Investigation refers to the activities of compiling, analyzing, and evaluating the geological, environmental features, and geotechnical conditions of a construction site in accordance with the requirements of construction projects, and compiling survey documents.

Geotechnical survey

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Geotechnical

Geotechnical investigation refers to the activities of compiling, analyzing, and evaluating the geological, environmental features, and geotechnical engineering conditions of the construction site, and compiling survey documents according to the requirements of the construction project. ^[1]

If the survey work is not in place, adverse engineering geological problems will be revealed, and even if the design and construction of the superstructure is of high quality, it will inevitably suffer damage. Different types and scales of engineering activities will have different degrees of impact on the geological environment; conversely, different geological conditions will bring different effects to the engineering construction. The purpose of geotechnical engineering survey is to find out the engineering geological conditions, analyze the existing geological problems, and make engineering geological assessments of the construction areas.

The task of geotechnical engineering survey is to correctly reflect the site's engineering geological conditions and the influence of rock and soil properties in accordance with the requirements of different survey stages, and to combine technical requirements such as engineering design, construction conditions, and foundation treatment to conduct technical demonstration and Evaluation, submission of concrete decision-making suggestions for dealing with geotechnical engineering problems and solving problems, and put forward design guidelines for foundations, slopes and other projects and guiding opinions for geotechnical engineering construction, provide basis for design and construction, and serve the engineering construction. The whole process.

Geotechnical engineering surveys shall be carried out in stages. Geotechnical engineering survey can be divided into three stages: feasibility research survey (site survey), preliminary survey and detailed survey, of which feasibility research survey should meet the requirements of site plan determination; preliminary survey should meet the requirements of preliminary design or expansion ; Detailed investigation should meet the requirements of construction design.

According to the different survey objects, it can be divided into: water conservancy and hydropower engineering (mainly referring to the survey of hydropower stations and hydraulic structures), railway engineering, highway engineering, ports and docks, large bridges and industrial and civil buildings. Because water conservancy and hydropower projects, railway projects, highway projects, ports and other projects are generally relatively large, investment costs and importance are high, the state has separately classified these types of engineering surveys and compiled corresponding survey specifications, procedures and technologies. Standards, etc., usually these projects are called engineering geological surveys. Therefore, the commonly referred to as "geotechnical engineering survey" mainly refers to the survey of industrial and civil construction projects. The main objects of survey include housing buildings, industrial plants, school buildings, hospital buildings, municipal engineering, pipelines and overhead lines, and shorelines. Engineering, slope engineering, foundation pit engineering, foundation treatment, etc.

The content of geotechnical engineering investigation mainly includes: engineering geological survey and mapping, exploration and use of soil samples, in-situ testing, indoor testing, field inspection and testing, and finally the qualitative analysis of site engineering geological conditions based on the above several or all means Or quantitative analysis and evaluation, to prepare the results report documents required to meet the different stages. ^[2]