Abstract: Waste soil storage yards are frequently encountered in the expressway construction in mountainous areas. The stability of these storage yards directly affects the construction of the adjacent highway subgrade and other structures. This paper presents the stability investigations of waste soil storage yard for a highway widening project in Yunnan Province. Throughout the field investigation, laboratory tests, numerical simulation on the storage yard, actual design details and constructability, the waste soil storage slope were rearranged. The recommended waste soil slope was analyzed under various conditions, such as, normal working, saturated, weak waste soil lenses and different levels of perched water. It is also recommended that the drainage measures to be installed at the surface of the proposed waste soil slope to minimize the stability risks induced by the erosion and the accumulation of the perched water.

Key words: Waste Soil Storage, Expressway, Slope Reshaping, Stability, Drainage Measures