在极限情况下，对于非常软弱的岩石，形成分离裂缝之前，也会发生边界处的沉陷。
In the limit, for very weak rock, settlement at the boundary can also occur before the separation crack.
进行室内三轴流变试验研究了风化破碎软弱岩石的流变特性。
Triaxial rheological experiment is done to study the rheological properties of soft rock which is rotten and cracked.
软弱岩石在地下洞室开挖中会经常遇到，其变形量的大小，直接影响着洞室的稳定与安全。
The deformation amount of weak rock, which is often encountered in excavation of underground caverns, directly affects the stability and safety of caverns.
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