富水砂卵石地层EPB盾构衡盾泥辅助施工关键技术研究  

Key Techniques of EPB Shield Auxiliary Construction with Paste HND in Water-rich Sand and Pebble Strata

作　　者：谢铁军 吕涛 杨果林[2] 刘欢 龙彪 XIE Tiejun;LV Tao;YANG Guolin;LIU Huan;LONG Biao(CCFEB Civil Engineering Co.,Ltd.,Changsha,Hunan 410004,China;School of Civil Engineering,Central South University,Changsha,Hunan 410075,China)

机构地区：[1]中建五局土木工程有限公司,湖南长沙410004 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《水利与建筑工程学报》2020年第5期74-79,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(51478484,51778641)。

摘　　要：以长沙市某电力盾构隧道为背景,针对富水砂卵石地层中传统泥膜护壁工艺和地表沉降控制技术的不足,通过室内试验和现场实践的方法,进行了富水砂卵石地层衡盾泥辅(HDN)助带压换刀和盾构掘进地表沉降控制关键技术研究。现场实践表明:在衡盾泥辅助带压换刀施工中,注入衡盾泥后在富水砂卵石地层的开挖面形成的泥膜质量好,泥膜护壁效果非常明显,有效解决了渗水透气问题;在衡盾泥辅助盾构掘进中,衡盾泥可有效填充盾体与土体之间的开挖间隙,显著提高了同步注浆及二次注浆效果,累计地表沉降最大值仅为5.75 mm,达到了盾构推进时的沉降控制目标。Based on the construction of a power shield tunnel in Changsha,focusing on the shortcomings of traditional mud film wall protection technology and surface settlement control technology in water-rich sand and pebble formations,the key technology of water-rich sand and pebble formation paste HDN-assisted tool change under pressure and shield tunneling surface settlement control is carried out based on indoor tests and field practice.Field practice shows that in the construction of paste HDN-assisted tool change under pressure,the mud film formed on the excavation surface of the water-rich sand and pebble stratum after injecting paste HDN is of good quality,and the wall protection effect of the mud film is very obvious,which could effectively solve the problem of water seepage and ventilation;while in the paste HDN-assisted tunnel excavation,paste HDN can effectively fill the excavation gap between the shield and the soil,thus significantly improve the effects of simultaneous grouting and secondary grouting.The maximum cumulative surface settlement is only 5.75 mm and which can meet the settlement control target during the construction.

关 键 词：富水砂卵石地层 土压平衡盾构 衡盾泥 带压换刀 沉降控制 

分 类 号：U455[建筑科学—桥梁与隧道工程]