Expansive soil deposits are considered to be problematic to the civil engineering construction. Lateral pressure development of expansive soils based on large scale tests indicate that under KO condition and under KA condition, the lateral pressure exerted by expansive soil is much higher and different from those predicted by normal theories. However, under air dry and compacted states the lateral pressure behaviour is as per conventional theories. The studies based on tests conducted in large scale devices (2 to 4 m wall height) with cohesive non swelling soil (CNS) backing interposed...