富水砂岩、泥岩隧道泄水降水减压施工技术研究

Study on Construction Technology of Sluicing and Dewatering Decompression in Water-rich Sandstone and Mudstone Tunnel

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。

The Shuangfeng Tunnel is driven through the tertiary water-rich sandy mudstone section,because of the soft soil,rich groundwater,there are two large accidents about water gushing and mud bursting in construction,so the construction is very difficult.Combined with the Shuangfeng Tunnel,the characteristics of the tertiary water-rich sandy mudstone formation are analyzed,the comprehensive construction method of sluicing and dewatering decompression of the tertiary water-rich sandy mudstone formation is introduced,and the effects of various schemes are reasonably analyzed and summarized,ho-ping to provide references for the construction of similar tunnel formation.