在风积砂地层修建隧道，由于开挖扰动后围岩完全变为松散体，无自稳能力，故施工难度大。

Tunneling in wind stockpiling fine sand is very difficult, since the sand undermined will become very loose and incapable of self-consolidating.

youdao

在风积砂地层修建隧道，由于开挖扰动后围岩完全变为松散体，无自稳能力，故施工难度大。

Tunneling in wind stockpiling fine sand is very difficult, since the sand undermined will become very loose and incapable of self-consolidating.

youdao