SPECIAL TESTS

Obtains the seismic velocity profile of the ground. Data can be utilized to predict the depth of bedrock, rock strength/rippability, and layer thicknesses.

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Used for mapping layer thicknesses, bedrock levels, topography, horizontal profiling, voids and sinkholes, faults and horizontal fracture zones. It is particularly useful where high detail is necessary or in complex geological environments.

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Measures the surface shear wave velocities that travel through the ground. The processed data can be used to estimate the thickness of overburden and bedrock and evaluate ground stiffness. The test can be conducted for onshore and offshore investigations.

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Establishes the seismic velocity profile of the ground which can be used to estimate the dynamic properties of soil and rock.

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A seismic test that utilizes the downhole test procedure. It can measure the compressional and shear wave velocities for on-land and offshore sites down to a depth of 500 meters.

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The use of electrical measurements on the ground's surface to determine the depth and thickness of underlying layers is a useful method for earth grounding studies, electrical designs, and detecting the groundwater level for water well installation and utilization.

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The ultimate solution for precise pavement analysis. With this advanced tool, pavement stiffness and remaining performance are measured with unparalleled accuracy. By referencing pavement design and traffic data, critical insights are provided to ensure roads remain durable and long-lasting. The FWD revolutionizes pavement maintenance strategies, serving as the key to smarter, data-driven decisions and superior roadway performance.

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Determines the ground resistance through the penetration of a CPT cone into the ground at a constant rate. The test provides valuable data such as soil type, compaction, shear strength, and stratigraphy.

An in-situ testing method used to achieve a quick measure of the in-situ stress-strain relationship of the soil. In principle, the pressuremeter test is performed by applying pressure to the sidewalls of a borehole and observing the corresponding deformation.

At GPI, we are at the forefront of geophysical survey technology in the Philippines, offering innovative Ground Penetrating Radar (GPR) solutions that unveil what lies beneath the surface. This minimally invasive geophysical tool uses electromagnetic waves to capture images below the ground, with its applications depending on the type of frequency antenna used. Our advanced GPR systems are designed to meet a diverse range of surveying needs, utilizing leading technologies with various antennas and applications.

1. GSSI SIR 4000 (100MHz Antenna with Mono and Bistatic Mode)

• Applications: Geotechnical (due diligence for boring), underground utility mapping (metallic and non-metallic pipes), subsidence and weak zone mapping, environmental, mining, cavity detection, pavement thickness evaluation.
• Maximum Penetration Depth: 8 to 12 meters (depending on ground conditions).

2. OKM ROVER WITH 50MHZ ANTENNA

The OKM Rover C4 equipment uses an airborne antenna which is raised to 4 to 6 inches above the ground surface, supported by a 50 MHz antenna which is capable of penetrating between 2 to 18 meters below the ground depending on the terrain and geology of the area.

• Applications: Geological, underground utility detection (for larger pipe and metallic objects), underground cavity detection, subsidence and weak zone mapping, environmental and mining exploration.
• Maximum Penetration Depth: 2 to 18 meters (depending on ground conditions).

3. LEICA DS 2000 DUAL ANTENNA (250 & 700MHZ)

The Leica DS2000 is expertly designed for geotechnical assessments and underground utility surveys, with a particular focus on detecting fiber optics and smaller utility wires and pipes.

• Applications: Geotechnical (due diligence for boring), underground utility detection (fiber optics, small and large pipe, cable wires), underground cavity detection, concrete evaluation, pavement thickness evaluation, engineering-related evaluation such as determination of distorted, fractured, and weak zone areas.
• Maximum Penetration Depth: 2 to 10 meters (depending on ground conditions).

The acoustic image logging equipment from Robertson Geo® operates with pulsed acoustic energy where it can image the borehole wall in the presence of opaque drilling muds. It is capable of detecting millimeter to centimeter scale fractures that can be helpful on detecting local fractures such as voids, faults and sheard zones' size and orientation necessary for in-depth analysis for seated structures.

The optical image logging equipment from Robertson Geo® operates with the RGB light sensor where it can image scan the borehole wall given its pre-existing conditions is only air-filled or clear water. It can capture the colored wall of the borehole which is useful for assessing the stratigraphy and structures on the drilled hole. The probe can determine the angle of the borehole by its inclinometer feature.

Capable of delineating underwater material layers up to 20 meters deep, this offshore survey method enables wide coverage profiling in hard-to-access areas, generates 3D profiles from 2D arrays, and detects subsurface anomalies such as manmade structures, voids, and unexploded ordinances.