top of page
Soil-Thermal-Resistivity-Testing.png
ArrowBackground.png

GEOPHYSICAL
ENGINEERING

​

​

Soil Thermal Resistivity Testing

EngineeringGeophysicsIcon.png

Prior to the design and installation of underground electrical cables, it is important to understand the thermal properties of the in-situ soil or made ground, to ensure the heat produced by current flowing through an underground power cable is properly dissipated and avoid premature failures.

​

Often estimations are made, but where conditions are uncertain or variable along a cable route, it is important that a proper quantitative assessment is made of the ground.

Cable-route.png

Above : Cable route showing 5 locations where soil thermal properties need measuring.

​

Soil thermal resistivity testing measures the capacity of the ground to conduct or dissipate heat. The thermal resistivity of a soil will determine whether a buried power cable remains stable or overheats.  A build-up of heat around the cable can reduce transmission efficiency, or in the worst cases cause it to melt.

Thermal-resistivity-testing.png

Above : In-situ thermal resistivity testing with a needle probe.

​

The testing procedure involves taking measurements along the cable route at intermediate or transitional locations. A needle probe is inserted in a pit or an open trench at the proposed cable depth. Thermal resistivity and conductivity readings can then be recorded and presented in a tabulated format to be used for accurate calculations by the installation engineers, prior to determining the capacity of the cable to be laid and the required sub-structure.

Resistivity-testing-results.png

Above : Example results of thermal resistivity testing at 3 locations.

​

The thermal resistivity of soils can vary greatly, from 0.3°C.m/watt to as high as 40 °C.m/watt, with the higher the reading, the more likely a cable is to overheat. The current rating of the cable should therefore be based on both the range and the highest value of soil thermal resistivity measured.

Potential problems can be identifi
ed by measuring the thermal resistivity of the in-situ soil. Remedial measures that can be taken, including changing the capacity and insulation of the cables, or installing corrective thermal backfills in the cable trench.

  • How accurate is SUMO's underground utility survey and what types of utilities can it locate?
    Using cutting-edge technologies like electro-magnetics, signal induced threading, and Ground-Penetrating Radar (GPR), our underground utility surveys accurately detect a wide array of buried utilities including metal and plastic pipes, drainage systems, electricity cables, telecoms, and fiber optic cables. The methodology ensures high accuracy without the need for invasive trial holes.
  • What is the turnaround time for obtaining results with SUMO's Underground Utility Detection service?
    SUMO’s service is built for rapid response. Contractors can receive immediate results onsite. Our equipment provides real-time information, and once we leave the site, the detected utilities are visibly marked on the ground surface for quick reference.
  • Does SUMO provide detailed mapping of the detected utilities for permanent records or construction purposes?
    Absolutely, SUMO not only marks the detected utilities on-site but also offers high-quality, color-coded survey drawings. These drawings can include topographic features and a comprehensive record of the utility detection survey, ensuring it meets the client’s needs for future reference or pre-construction design works.
  • Topographical and Geophysical survey
    In addition to mapping out utilities, our experience team can accurately survey the land, creating topographical drawings for use. With our state-of-the-art aerial technology, nothing is missed.
  • What additional information can be included in the underground utility mapping service provided by SUMO?
    In addition to topographic features, SUMO’s mapping service can include fixed surface utility features such as inspection chambers, valve boxes, and telegraph poles. It can also incorporate key topographic details like building lines, fence lines, kerb lines, street furniture, street names, building names, and house numbers, facilitating easy site location.
  • Does the utility mapping service by SUMO include standard referencing and compatibility with existing survey data?
    Yes, SUMO ensures the utility mapping references the ordnance survey grid and level datum as standard. Additionally, the drawings can be supplied to a specified grid and level datum and can overlay an existing topographical survey, making it a versatile and adaptable service for various project needs.
  • What sets SUMO Services apart from other survey providers?
    SUMO stands out due to our impeccable level of service with nationwide coverage, state-of-the-art equipment, and our commitment to delivering top-quality, detailed colour-coded survey drawings in both hard and electronic formats.
  • How do I request a survey quotation from SUMO Services?
    Requesting a quotation is easy. Just click on the "Request a Survey Quotation" button on this page, and our team will get in touch with you promptly.
  • Can I book a SUMO Survey online?
    Yes, you can! Simply click on the "Book a SUMO Survey" button on this page, and you can schedule your survey with us at your convenience.
  • What type of survey is suitable for my project or site?
    Our experienced team will work with you to determine the most appropriate survey for your specific needs. Contact us, and we'll assist you in making the right choice.
  • Can I obtain both digital and hard copies of survey drawings?
    Absolutely. We offer the convenience of electronic copies for digital use and hard copies for your records. Just let us know your preference.
  • Do you provide custom survey solutions for unique projects?
    Yes, we understand that every project is unique. Our team is highly adaptable and can tailor our surveying services to meet your specific requirements.
  • How do I get in touch with SUMO Services for further questions?
    For any additional questions or inquiries, feel free to contact us through the contact form, and our dedicated team will assist you promptly.
ArrowBackgroundLong.png
SideStripes.png

FREE SURVEY QUOTATION

 

Receive a FREE Survey quotation from one of our survey engineers?

 

Chat through any requirements you need, including site survey, survey methodologies and detail requirements.

Geophysical Engineering Surveys
 

360Degree.png

Air Raid Shelters

360Degree.png

Cellars & Basements

360Degree.png

Post Tension Cables

360Degree.png

Underground Storage Tanks

360Degree.png

Air Voids

360Degree.png

Chimney Flues

360Degree.png

Rebar

360Degree.png

Water Engineering

360Degree.png

Badger Setts

360Degree.png

Earthing Installations

360Degree.png

Sinkholes

360Degree.png

Burials

360Degree.png

Geological Application

360Degree.png

Soil Thermal Resistivity Testing

360Degree.png

Buried Foundations

360Degree.png

Landfills

360Degree.png

Structural Investigations

360Degree.png

Buried Manholes

360Degree.png

Mineshafts

360Degree.png

Tree Roots

bottom of page