In recent years, several urban road collapse incidents have occurred in Shenzhen, prompting the Shenzhen Geological Bureau to take immediate action. To address the growing concerns, the bureau commissioned a local geophysical exploration company to conduct detailed geological surveys on suspected road sections. The primary method used was ground-penetrating radar (GPR) for surface scanning, which identified potential anomalies at certain locations along the coastal area. However, due to significant measurement errors, the geological anomalies detected at 4-meter and 8-meter depths could not be fully relied upon as the main basis for official geological reports.
To ensure accuracy, the Shenzhen Geological Bureau decided to purchase the Sauer single backpack core sampling rig, a portable and efficient tool designed for verifying geophysical findings. The team transported the rig to the identified abnormal section and prepared for drilling. A total of five boreholes were drilled, with depths ranging from 4 meters to 12 meters. During the drilling process, the staff analyzed the footage and backwater conditions of the rig to determine the subsurface geological structure.
The Sauer rig is manually operated, and when it moves quickly without requiring excessive pressure, it typically indicates an anomaly beneath the surface. The team recorded the initial depth at which this occurred, calculated the thickness and position of the affected area, turned off the water source, collected representative samples, and completed the verification within three hours. The results revealed that the underground layers between 3 to 4 meters were loose and highly saturated with water, indicating a flowing sand layer. Additionally, one hole located about 8 meters deep showed a nearly 1-meter void.
The Sauer single backpack core sampling rig is equipped with a specially designed diamond drill bit that ensures a long service life, fast drilling speed, and a maximum depth of 20 meters. This patented equipment is widely used in the U.S. and offers excellent portability, as it can be carried by a single person. Its lightweight design—only 18 kg for a standard 3-meter model—makes it easy to disassemble, install, and operate. It is particularly suitable for construction, mining, and forensic applications where mobility and flexibility are essential.
The rig’s sampling capabilities offer a more efficient alternative to traditional methods like manual excavation, trenching, or well testing. Not only does it significantly improve sampling efficiency, but it also minimizes damage to vegetation and reduces environmental impact. As a result, it has become an essential tool in shallow geological exploration and is increasingly adopted in various fields such as physical and chemical exploration, regional geological mapping, mine vein exploration, resource evaluation, geotechnical engineering inspections, and blasting operations.
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