tunnel opening meaning in Chinese

轴隧出入口

The tunnel opening is so narrow that we could only get in there sideways
洞口太窄了，我们只能侧着身子走进去。
The principal stress value arised alteration , the magnitude of stress closed to 25 ~ 32mpa , its influence scope was within the scope outside of tunnel opening 10 ~ 15 meter , maximum tense focused at vault and middle of floor about half meter . shearing stress focused at corner of vault and wall , always been sheared
主应力量值也发生了较大改变，压应力可达25 32mpa ，其影响范围在隧道边墙外10 15m ；拉应力集中在拱顶和底板中部约0 . 5m范围内，最大可达10mpa ；在拱腰和墙脚常为剪应力集中区，易发生塑性剪切破坏。