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双丰隧道穿越第三系富水砂泥岩段,由于该段地层性软,地下水丰富,施工中曾先后发生两次较大涌水突泥事故,施工难度极大。结合双丰隧道,分析了第三系富水砂泥岩地层的特点,详细介绍了第三系富水砂泥岩地层泄水降水减压的综合施工方法,并对各种方案产生的效果进行合理分析与总结,为类似隧道地层施工提供借鉴。
Shuofeng tunnel through the Tertiary water-rich sandstone and mudstone section, due to the strata of soft, abundant groundwater, construction has occurred twice in a large gushing mud accident, construction is extremely difficult. Combined with the Shuangfeng tunnel, the characteristics of the Tertiary water-rich sandstone and shale stratum are analyzed. The comprehensive construction method of the drainage dewatering and depressurization in Tertiary water-rich sandstone and mudstone formations is introduced in detail. The effects of various schemes are analyzed reasonably With the conclusion, provide a reference for the construction of similar tunnel strata.