big structure of surrounding
big structure of surrounding
周边大结构
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Meanwhile, surge shaft is an underground structure because its body is buried by surrounding rock, and the excavation of cavern with big inner diameter will influence stability of surrounding rock.
同时调压井埋于地下，属地下结构，大内径洞室的开挖关系到围岩的稳定。
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