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Abstract The discontinuous deformation analysis(DDA) method which discretizes the study objects to blocks is a of discrete medium computation methods. The original DDA is based on the small deformation and small rotation assumption which uses time step accumulation to simulate the large deformation and large rotation. So it will produce errors，especially when the large rotation occurs. The DDA program modified by finite deformation theory is conducted；and the results after each time step are modified by finite deformation geometric field. Two examples are carried out to validate the modified code. The results show that the modified code can handle the large rotation problem well and eliminate the rotation error；and it also can be used to solve the small displacement and small rotation problem. The modified code expands the application scope of DDA and can be used as an efficiency tool for engineering calculation.
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Received: 22 April 2011
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2011, Vol. 30 
