Due to high in situ stress in the powerhouse area, important deformation of local surrounding rock, rock burst, shotcrete spalling occur during excavation.

由于场区地应力比较高，在开挖期间出现了局部围岩的大变形及岩爆、喷混凝土层剥落等不良现象。

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And reach a conclusion in the tunnel and stability of the surrounding rock, rock deformation, stress distribution, economic and technical aspects of security.

并且分别从隧道围岩稳定性方面、围岩变形方面、应力分布方面、经济和技术方面以及安全方面得出结论。

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It is shown that the characteristics of shear stress acting on bolt vary in different zones zone of surrounding rock and are reflected in the axial stress distribution of bolt.

结果表明，在围岩不同区内，锚杆所受剪切力具有不同的特点，而且，锚杆所受剪切的特点在锚杆轴力分布中得到了反映。

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