Some Civil 3D Model is not showing up when imported into Infraworks，Why？

[liujingxin123]

Only two pieces remain at the complete intersection。

[tcorey]

If you turn off the image, is the surface there? Maybe it is being imported, but there’s a display problem. 

[liujingxin123]

If I only import the corridor ，some coddidor doesn‘t show up ，but if I import the corridor and the coverage ，only see the coverage .

Can you give me your email ，I send the dwg file to you ？

[liujingxin123]

I don‘t know what I did ，The intersection becomes showing three quadrants，the SW quadrants only show up the coverage 。