loosened zone meaning in Chinese

松碎带

For the construction of single - arch tunnel within cracked surrounding rocks , 8 tunnel models are set up to study the effect of the earth pressure distribution of the various surrounding rocks due to excavation . the relationships between the loosen zone of tunnel radial earth pressure and the tunnel diameter , the characteristics of surrounding rocks and the exposed time are revealed . it is showed that the pressure loosen radius is 1 . 2 ~ 2 . 0 tunnel diameters and the strongly loosen radius drops to 0 . 5 ~ 1 . 0 one for double lane tunnel
对于单拱破碎围岩隧道的构筑问题，作者设置了8个隧道模型，研究开挖对不同隧道围岩压力分布的影响，揭示了洞周径向压力的松弛范围与洞径、围岩特性、裸露时间的关系，得到双车道隧道压力松弛半径为1 . 2 2 . 0倍洞径，强烈松弛区半径为0 . 5 1 . 0倍洞径。