Underground Investigation

Waterland offers a wide range of professional surveying services, including Land Surveying, Underground Utility Mapping, and Multi-Channel Analysis Surface Wave (MASW) Survey, Multi-array 3D Radar Survey. Our advanced techniques ensure precise mapping, underground void detection, detecting existing obstruction and ground assessment while minimizing disruption. With a focus on safety and compliance, we deliver reliable data vital for effective project planning and execution.

Underground Utility Mapping Survey

To address the challenges posed by poorly managed underground utilities, we offer Underground Utility Mapping Surveys. This essential service helps prevent disruptions to water and electricity supplies and mitigates risks of accidents, such as gas explosions. Our approach utilizes electromagnetic wave signals to accurately detect the alignment and depth of underground utilities, providing clients with vital information for:

  1. Detecting utility alignment and depth
  2. Managing utility properties using record drawings
  3. Designing utility layouts
  4. Reducing project risks and costs associated with utility damage
  5. Complying with statutory regulations, such as the Electricity Supply Lines (Protection) Regulation Cap 406

Multi-Channel Analysis Surface Wave (MASW) Survey

Our MASW survey employs trenchless geophysical technology, providing an efficient alternative to traditional drilling and trenching for site investigation. This non-destructive method is particularly advantageous in urban areas, minimizing surface disruption while delivering detailed insights into subsurface conditions.

MASW measures seismic surface waves mainly from 2 types of seismic sources

  • Active Mode:
    • Source generated by hammers or weight droppers on ground
    • Survey depth is within 30m
  • Passive Mode:
    • Source obtained by ”ambient noise” – such as trucks or construction activities
    • Survey depth from 30m to 120m

Applications of the MASW Survey:

  • Identification of subsurface layers
  • Location of deep obstructions
  • 3D visualization of boulders and rock head profiles
  • Void detection beneath high water levels

Multi-array Vehicle Mount 3D GPR Survey

This Multi-array Vehicle Mount 3D GPR System consists of several individual antenna elements (transmitters and receivers) arranged to create multiple measurement channels that operate simultaneously and are closely spaced. It is designed to survey larger areas and apply 3D processing and visualization techniques , collecting significantly more data in one pass compared to a typical GPR system. Furthermore, this vehicle- mounted system can help eliminate the need for Temporary Traffic Arrangement implementation in carriageway areas , which can greatly reduce the time and cost of survey work.

  • Application:
    • Underground Void Detection
    • Road Health Condition Survey
    • Water Leakage Detection
    • Archaeological Investigations
    • Utility Mapping
    • High-speed carriageway application

Borehole PS Suspension Logging Geophysical Survey

The PS Logger is a tool used to measure how fast seismic waves (P and S waves) travel through the ground in a borehole (a narrow, deep hole drilled into the earth). These measurements are important because they help engineers understand the stiffness of soil and rock, particularly for projects such as offshore wind farms or large-scale construction projects.

In borehole PS suspension logging, a fluid-filled borehole is used to transmit seismic waves generated by a PS Logger tool. The tool’s dipole source creates low-frequency waves, and two receivers measure the travel times of P- and S-waves through the surrounding soil or rock. These wave speeds are used to calculate soil stiffness (Gmax) and other material properties critical for geotechnical projects.

The importance of the PS logger works well in soft soil and underwater environments, where other methods might fail.
Calculates Gmax, which helps identify how soil or rock reacts to vibrations or waves.

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