Geosynthetics MCQ with answer and solution

Concept

Geonets consist of a continuous network of intersecting ribs that create large open spaces, enabling high in-plane fluid flow rates, thus serving primarily as drainage elements.

Step-by-step solution

1. Understand the primary functions of various geosynthetics. 2. Geogrids are primarily used for reinforcement due to their high tensile strength and open aperture grid structure. 3. Geonets are structured to provide in-plane drainage for liquids and gases. 4. Non-woven geotextiles primarily function as filters and separators, though they permit cross-plane flow. 5. Geomembranes act as impermeable liquid or gas barriers.

Explanation

Geonets are geosynthetics specifically designed with a planar drainage structure that allows the efficient in-plane conveyance of liquids or gases. Non-woven geotextiles can also act as filters and allow water to pass, but geonets are primarily manufactured to function specifically as drainage media under high compressive loads.

Why the other options are wrong

A: Geogrids provide reinforcement. C: Non-woven geotextiles primarily serve as filters and separators. D: Geomembranes serve as impermeable barriers.

Shortcut

Think 'Net = Drainage/Network for flow' and 'Grid = Reinforcement/Strength'.

Common mistake

Confusing non-woven geotextile's filtration function with the dedicated planar drainage function of a geonet.