求翻译：当隧道工程遇到软弱围岩，高地应力区域时，施工及维护会非常困难，常常会出现围岩大变形，有时甚至连正常施工安全都难以保证。是什么意思？

When the tunnel works to encounter soft surrounding rock, high ground stress zone, construction and maintenance will be very difficult, and often the surrounding rock mass deformation, and sometimes even normal construction safety is difficult to guarantee.

When the tunnel experience weakness of stress, the highland Rock area, construction and maintenance will be very difficult and often the large deformation of rock, and at times it may not even work properly, it is difficult to guarantee security.

When the tunneling meets the weak adjacent formation, when high crustal stress region, the construction and the maintenance can be extremely difficult, can appear the adjacent formation big distortion frequently, sometimes even continually the normal construction safe all with difficulty guaranteed.

When encountered weak surrounding rock of tunnel engineering, high stress areas, construction and maintenance can be difficult, often surrounding rock deformation can occur, sometimes even difficult to ensure normal construction safety.

正在翻译，请等待...