I want to research the effect of tunnel excavation on deformation and stress distribution of surrounding rock, but when I use Parametric scanning to change the long of the tunnel, I find the long is unchange. could you give me some advices? thanks. (您好，我打算研究开挖步对隧道的影响，采用参数化改变开挖步，发现实际上并没有改变隧道长度。希望各位朋友指教。
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