Abstract:

In the calculation of unbalanced thrust force using iterative algorithm, the inter-slice force direction is assumed to be parallel to the sliding surface of the upper slice bottom, which results in excessive calculation value and leads to danger of projects. The authors improved the method through correcting the  angle between the directions of inter-slice forces in the slope. What’s more, we derived the formulas respectively in the presence of and in the absence of seismic force. On the basis of Visual Basic programming, we applied the improved formula to the calculation of an example and compared the result with that of the previous unimproved formula. The result indicates that the improved method is practicable, and presents a more reasonable physical process. 

Key words: direction angle, unbalanced thrust force, iterative method