Question

The slope of isochrones at any point indicates ___________

(a) change of pore pressure with total pressure

(b) change of effective pressure with pore pressure

(c) change of pore pressure with depth at time interval t

(d) change of pore pressure with volume

I had been asked this question during an online exam.

I'm obligated to ask this question of Terzaghi’s Theory of One Dimensional Consolidation in chapter One Dimensional Consolidation of Geotechnical Engineering I

Answer 1

Right choice is (c) change of pore pressure with depth at time interval t

For explanation: In soil mechanics, the isochrones represent the water levels in piezometric tubes at the same time. The slope of isochrones at any point at a given time indicates the rate of change of pore pressure with depth.