非连续变形分析方法中一些控制参数的设置

非连续变形分析(DDA)方法是近年来发展起来的一种分析不连续介质力学的岩土工程数值模拟方法,该方法涉及到一些人为设定的控制参数,而这些参数会对计算结果产生一定的影响.通过实例分析,作者较深入地探讨了步位移、弹簧刚度及时间步的选取,认为对计算结果影响最大的是步位移,并进一步认为当步位移取值范围为0.1～0.002,弹簧刚度取值范围为20 E～100 E,时间步取值为0.01时不仅迭代速度快,而且对计算结果的影响可以忽略,这在DDA的理论研究及实际应用中均具有重要意义.

Choice of some control constants in DDA method

The DDA method is a new numerical simulation technique for block system in jointed rock (masses). In this method, some constants should be set before computation, and these constants may affect the results. In this paper, step displacement, spring stiffness and time step are discussed through an (example). These are the important control constants in the DDA method. The results indicate that the (affection) of step displacement on the computation results is greatest, and that this affection can be (neglected) when the step displacement is set from 0.1 to 0.002, the spring stiffness from 20 E to 100 E, and the time step as 0.01. The proper choice of these control constants will be of significance in theory study and actual use of the DDA method.