Micro Dynamic Sensor 
Test Accessories 
Digital Image Measurement 
Geotechnical Tests 
Hydrate 
In-situ Tests 
Engineering Investigation 
Drilling Rigs 
Ocean Testing This special issue focuses on technical expansion tailored to the testing requirements of coarse-grained soil. It introduces a newly developed triaxial testing system and direct shear testing system for coarse-grained soil, providing high-precision solutions for studying the strength and deformation characteristics of coarse-grained materials such as rockfill and gravel.
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