Application Of Discontinus Deformation Analysis (DDA) To The Slope Stability Analysis Of The Expansive Soil

This paper is a part of the scientific research project of the Ministry of Communications"The research of the expensive soil slope stability calculatingmodel about towed space-time effect"---a sub project of "A complete set oftechnical research to construct highway in expansive soil areas " which is entrusted by Changsha University of Science and Technology. Based on the exploring of Nanyou Highway of the Ningming parts, we analyze the character of the expansive soil slope. Aimed at the actual slope damaging at Nanyou Highway of the Ningming parts, we erect corresponding geological model and mathematical model separately. Because of it' s damaging character not liking formerly engineering examples, we try to apply the discontinuous deformation analysis (DDA) method to the slope stability of expansive soil calculating.Then, theory system of the discontinuous deformation analysis method is explained and material math model is deduced particularly. And aimed at the actual engineering, I expend and develop the theory model of the discontinuous deformation analysis, and simplify the border bind, the vertical and horizontal relations, the method of dynamic and static.At last, on the basis of improved model, DDA software on the style of Windows has been compiled. The software uses Microsoft Office Access 2003 to build the data base, it can carry on the preceding treatment, including reading the blocks'geometrical and physical intonnal ion , il can process alternate of displacement and detormat ion on each block, it can also draw the deform figures of them. Using the software to calculate the expansive soil slope, it gets the simular results which are basically according to the reality and it also reflects the slope' s towed space time effects. Meanwhile (he software can make it easily, efficiently when solving the problem of the expensive soil slope deformation and damagement.