ABSTRACT
Novel equipment is introduced for researching lateral pressure (programmed and driven by two computers) that can move the front rigid wall arbitrarily slowly, applying one of three basic movements, measuring both components (normal, frictional) of contact pressures acting on the front and back walls and registering slip surfaces in the soil mass. Two complete histories of normal lateral pressure, both active and passive, are presented. The histories prove the behaviour of ideally noncohesive mass during wall translative motion by two doubles of the same experiments (passive pressure and active pressure) using the same material. The wall movement velocity was less than 0.005 mm/min.
