Physical Experiments with Medium Granular Models under Lateral Passive Pressure

A number of objections may be raised against the contemporary earth pressure theory. On the basis of theoretical considerations, physical and numerical experiments an advanced General Lateral Pressure Theory (GLPT) is being developed at actual stage. The long-term physical experimental research of lateral pressure has been proceeding since 1996. Original stand and pressure sensors were developed for the monitoring of both normal and tangential (shear) components of lateral pressure. The front wall of the stand with the sensors can be moved arbitrarily, the lateral glass walls enable visual monitoring of displacements and deformations within the tested soil mass. The research using this stand has yielded some obviously new results some of which can be considered substantial. Among others such high passive pressure was achieved that the nearest lateral glass walls cracked. The experiment E3/2 was completed successfully, but the stand renovation was necessary. The second development stage of the stand involved the production and installation of thicker lateral glass walls and particularly the development and implementation of a new concept of front wall motor drive with computer control. A further doubling experiment E4/2 is under preparation.