In the construction and development of transportation infrastructure, geotechnical foundations play a decisive role in the success and sustainability of projects. Thorough understanding and detailed surveys of geology, topography, and hydrology not only help select optimal locations but also provide the scientific basis for designing construction solutions that minimize risks during construction and operation. With specialized expertise in geotechnical surveying, A2Z proudly accompanies key projects nationwide, leading design from solid foundations to deliver safe, durable, and highly efficient works.
Dai Ngai 1 bridge project site survey work
Geological, topographical, and hydrological principles in design consulting
A2Z adheres to design principles based on geological, topographical, and hydrological surveys as follows:
– Correspondence between the type of structure and suitable geological foundation;
– Assessment of specific geological phenomena to identify risks and apply appropriate solutions;
– Detailed surveys to select optimal design solutions and reduce risks;
– Integration of topographical and geological survey data to ensure consistency and accuracy in design;
– Combining hydrological analysis to determine design solutions appropriate to flow patterns, water levels, and erosion-deposition conditions.
Comprehensive geological survey capabilities
- Survey equipment for geology, topography, and hydrology
A2Z invests in a modern, diverse, and specialized system of geological, topographical, and hydrological survey equipment, enabling complex surveys under all terrain conditions—from deep seas and valley bottoms to rugged mountainous areas. Key equipment includes:
– Electronic surveying instruments (Total Station, GPS RTK): Accurately measuring coordinates and elevations for detailed topographic mapping;
– Multi-purpose geological drilling rigs (Rotary drilling rigs, Core drilling rigs): Extracting soil and rock samples from surface to deep mountainous terrains;
– Resistivity meters and SuperSting R1/IP: Non-destructive geological investigations to determine underground structures, detect karst caves and voids;
– Geological ultrasonic equipment (Seismic refraction, MASW): Determining physical and mechanical properties of soil and rock via ultrasonic waves, assessing foundation stiffness and compressibility;
– Multi-channel geophysical equipment: Analyzing complex geophysical signals in difficult-to-access areas;
– Drones equipped with LIDAR sensors and high-resolution cameras: Collecting topographic data and surveying remote, inaccessible areas such as islands and rugged terrain;
– Certified soil mechanics and geological laboratories: Processing drilling samples and analyzing soil and rock mechanical properties with high precision;
– Advanced tunnel survey equipment: For example, at the Dong Dang – Tra Linh expressway project, A2Z used the advanced multi-electrode SuperSting R1/IP system (Advanced Geosciences, USA) featuring high current output, deep probing, fast data acquisition, and flexible software, effective in complex geological conditions;
– Hydrological survey equipment: Including automated water level meters, flow velocity meters, rainfall and water level sensors, underwater riverbed cameras, and hydraulic-hydrological simulation software. This system enables accurate hydraulic variation analysis to support foundation design and long-term structure protection.
The integrated use of this diverse equipment allows A2Z to conduct comprehensive, accurate surveys across varied geological and topographical environments, including deep sea and challenging mountainous regions.
Geological exploration equipment for the Dai Ngai 1 project
Resistivity meters and SuperSting R1/IP (Advanced Geosciences, USA)
Dong Dang – Tra Linh Expressway Project survey site
Highly Skilled Workforce with Extensive Practical Experience
A2Z proudly employs a team of over 20 highly qualified experts, engineers, and technicians specializing in geological, topographical, and hydrological surveys, with years of practical experience in large-scale, complex terrain projects nationwide. The team includes:
– Lead engineers and top experts who have consulted, designed, and supervised many key transportation infrastructure projects;
– Personnel deeply familiar with modern survey methodologies, capable of applying advanced technologies and handling complex data;
– Field teams skilled at deploying surveys in difficult terrains such as high mountains, deep valleys, and island regions;
– Professional collaborators who work efficiently with design units, contractors, and governmental authorities;
– A proactive, innovative mindset continuously updating technical knowledge to ensure the most effective, optimized survey solutions for clients.
The combination of high-quality human resources and modern equipment forms the foundation for the reputation for reliability, quality, and efficiency in geotechnical and topographical surveying across all projects of A2Z.
Geological drilling work for the Dai Ngai 1 Project
Two Challenging Geological Survey Projects Successfully Completed
- Dai Ngai Bridge – Estuary Bridge connecting Tra Vinh and Soc Trang:
Located at the estuary, this survey area is subject to strong tidal influences, large waves, complex currents, and perennial saltwater-freshwater mixing. The terrain is constantly shifting, with weak geological strata alternating with mud and sand, along with a dense river network, posing numerous challenges to geological and topographical surveying. Hydrological surveys played a crucial role in understanding flow patterns, erosion depths, and sedimentation processes—factors directly affecting foundation and bridge structure design. This project required comprehensive survey capabilities and deep analytical expertise to ensure safety and sustainability under harsh estuarine conditions.
Meeting on Dai Ngai 1 Bridge model wind tunnel test at SOH – Denmark
- Cho Moi – Bac Kan Expressway Survey Project:
This route passes through rugged mountainous terrain, with heavily weathered rock formations and numerous complex karst caves, presenting high risks for infrastructure design and construction. Cracked rock masses, loose soil cover, and deep geological uncertainties made traditional survey methods inadequate for accurate results. In response, A2Z implemented deep drilling combined with advanced geological-topographical analysis, employing modern equipment to trace voids and reliably determine foundation structures. This comprehensive survey solution formed a critical basis for safe and cost-effective design in the challenging northern mountainous geological environment.
Additionally, hydrological surveys at mountain streams and valleys were integrated to assess flood risks and erosion hazards, effectively managing hydraulic factors impacting route design.
Notable Projects Undertaken by A2Z
- Dong Dang – Tra Linh Expressway (First prize for architectural plan)
- Huu Nghi – Chi Lang Expressway
- Khanh Hoa – Buon Ma Thuot Expressway
- Cho Moi – Bac Kan Expressway
- Hoa Binh – Moc Chau Expressway
- Hoang Lien Road Tunnel
- Tan Phu – Bao Loc Expressway
- Ho Chi Minh City – Trung Luong Expressway
- Prenn Pass Expansion – Lam Dong
- Dai Ngai Bridge – Tra Vinh – Soc Trang
Conclusion
Geological and topographical surveys form the critical foundation ensuring safety, effectiveness, and sustainability for transportation infrastructure projects. With an experienced expert team, state-of-the-art equipment, and a scientific workflow, A2Z proudly stands as a trusted partner accompanying key national projects, leading design from firm geotechnical foundations to comprehensive success.
By: Vu Lan Huong; Translation: Quang Anh
