Investigating mechanical properties of ground using probe lowered from lorry using membrane tube filled with fluid in which pressure and vol. variations are monitored wrt each other.

摘要

The equipment for measuring the mechanical characteristics of the ground includes dropping a membrane tube into a bore hole in the ground. A liquid is introduced under pressure into the tube, and the increase in volume of the tube is then measured as a function of the pressure exerted. A pressure sensor is dropped into the ground into a position just above the maximum deformations of the membrane tube in order to determine the interstitial pressure in the region of the probe. The pressure sensor is a piezoelectric device, and there is also a piston and hydraulic element to prevent the collapse of the tube. ADVANTAGE - Is protected against collapse of membrane tube.