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中铁二十局集团有限公司
目 录
第一章 总体概况说明 ············································· 1
第一节 编制依据 ············································· 1
第二节 工程简介 ············································· 1
第三节 地质、水文条件 ······································· 1
第四节 围岩级别及工程数量 ·································· 2
第二章 洞口段施工 ··············································· 4
第一节 地表水拦截和预加固 ···························