对于同一个基坑开挖模型,共10M,分10步开挖,每步开挖1M,本人分别用midas和plaxis软件分别模拟,结果plaxis只能开挖到3m,而midas能将10M全部开挖完,大家知道plaxis如果在某步土体或墙体发生了破坏,或者迭代不收敛,程序就会自动终止计算,以后的步骤也就无法计算,而MIDAS却能将10步全部计算完,而看后几步开挖的水平位移,明显超出合理范围,所以一直搞不清楚midas是如何判断到底能开挖几米的,如何确定有效的开挖步数,程序有什么提示没有,是看输出的迭代过程说明,还是看其他哪里?下面midas最后一步的迭代过程说明:
> PHASE 12 INITIALIZED
> STEP 1 : FORCE NORM = 1.084E+07 TOLERANCE = 1.000E-03
> RELATIVE OUT OF BALANCE FORCE = 6.581E-02 CHECK = FALSE
> RELATIVE OUT OF BALANCE FORCE = 3.937E-02 CHECK = FALSE
> RELATIVE OUT OF BALANCE FORCE = 2.108E-02 CHECK = FALSE
> RELATIVE OUT OF BALANCE FORCE = 6.728E-03 CHECK = FALSE
> RELATIVE OUT OF BALANCE FORCE = 2.896E-03 CHECK = FALSE
> RELATIVE OUT OF BALANCE FORCE = 2.059E-03 CHECK = FALSE
> RELATIVE OUT OF BALANCE FORCE = 7.618E-04 CHECK = TRUE
> STEP 1 TERMINATED,CONVERGENCE AFTER 6 ITERATIONS
> TOTAL LOAD FACTOR: LOADING( 1)* 1.000E+00
>
> /DIANA/DC/END 22:59:39 988.64-CPU 97.75-IO STOP
>
> 读取结果文件完成。