TRI's state of the art interface friction laboratory features 14 large scale direct shear boxes. Our loading capacity ranges from 50 to 40000 lb/ft2 (2-1900 kPa). Our in-house manufactured low load shear boxes provide our clients with improved testing and repeatability of interface shear strengths under cap and construction loading conditions (50-1000 lb/ft2, 2-50 kPa). Continued research in GCL hydration and consolidation, gripping and clamping systems ensures that TRI is the industry leader in interface friction testing.

TRI performs Interface Friction/Direct Shear testing to investigate slope stability:

• geosynthetic-geosynthetic interfaces

• soil-geosynthetic interfaces

• internal GCL shear and GCL interfaces

• large-scale soil shear strength

• long-term creep at the interface

• constant load or constant strain testing

Relevant Standards

ISO 12957	Direct Shear/Interface Friction
ASTM D 5321	Direct Shear/Interface Friction
ASTM D 6243	GCL Internal Shear and GCL Interface Friction