Groundwater – The occurrence of groundwater is very important in geotechnical investigation.Changes in subsurface soil composition and structure such as encountering rocks and unconsolidated soil should be specified. Exploration logs should be provided for the client so that variations across the site can be assessed. Each soil or geologic unit should be described with respect to its properties relevant to the conclusions and recommendations. Subsurface soil conditions – Subsurface soil condition can be ascertained by carrying out tests in the soil by taking borings, digging test pits, lab testing of soil, chemical testing and field instrumentation.Geological setting – This section should provide a summary of local stratigraphy, occurrence of groundwater and regional geology.Surface features such as buildings, wells, vegetation, geological features, hazardous areas, etc., near the site should be specified. Description of adjacent properties and their current use should be mentioned. Location and surface conditions – Land details should be provided for identifying the property, including address and parcel numbers.This section describes all site features that are relevant to the project, including conclusions arrived at and methods recommended. This section includes the overview, background, scope and purpose of the project, and summary of the investigation, including research data in subsequent subheadings. This presents the base or thread of the investigation and the important conclusions derived from it. All these methods vary in the way they bore, for example directional boring is carried out at an angle from the surface while other methods utilize entry and exit pits dug to the depth of pipe ingress. When it comes to trenchless projects, horizontal directional drilling (HDD), horizontal auger boring (HAB), microtunneling and pipe jacking are some of the methods used to install pipelines. Free Download: Geotechnical Site Investigations: Your Ultimate Guide to Identifying Project RisksĪ good geotechnical report is never brief, but goes into elaborate details for the specific project so that no details are missed. Even in the case where site location is unchanged but there is a change in the nature of the project, ownership or design team, the geotechnical report is considered obsolete. The report is made based on factors specific to projects such as the nature and scope of the project, objectives and goals of the client, site situation and utility location. To get the most out of a geotechnical report and to avoid costly overruns, it should be studied thoroughly and, if needed, clarified with the engineer responsible for the report. Each investigative report is unique and is non-transferable to another project unless so specified by the engineer. Geotechnical investigation for trenchless pipeline projects is undertaken to perform investigative assessment for a specific client, purpose and type of pipeline project. Learn more in The Geotechnical Investigation: Which Method Should We Use?) Uniqueness of Geotechnical Reports (There are numerous ways to conduct geotechnical investigations. Retaining the geotechnical engineer for the duration of the project can be useful in managing associated risks. However, these tests are carried out at specific intervals along the proposed route and it is possible that there is moderate to significant variation in actual subsurface condition. Managing these risks is made easy by referring to geotechnical investigation reports carried out by geotechnical engineers for the concerned project.
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