富水砂卵石地层RATSB组合式盾构接收技术研究

依托山西中部引黄项目下穿北川河段工程,针对其处于富水砂卵石混合土地层,又临近建筑物、塌陷区,地下水与北川河有水力联系,围岩的自稳能力差,盾构隧道接收风险大等难题,提出了一套RATSB组合式盾构接收施工技术(该技术获国家专利),并对其所含五大技术(即地表刚性袖阀管注浆、洞内水平超前帷幕注浆、管井降水、接收端暗挖、反压回填等施工技术)进行了详细阐述,分析了该技术的特点。现场实践表明:该技术相较于常规的洞门钢环接收技术,操作更加简便,且组合使用了多种成熟工艺,降低了盾构接收风险,实现了富水砂卵石混合土地层深埋盾构洞内解体,取得了良好的经济效益和社会效益。

Study on RATSB Combined Receiving Technology of Shield Tunnel in Water-rich Sand and Gravel Stratum

Relying on the project of the Yellow River Diversion Project in the central part of Shanxi that passes through the Beichuan River,it is located in a water-rich sand and pebble mixed soil layer,and is also close to buildings and subsidence areas.The groundwater is hydraulically connected to the Beichuan River,and the surrounding rock has poor self-stability and difficulties such as high risk of tunnel reception.A set of RATSB combined shield receiving construction technology(won the national patent) is proposed,and the five technologies(i.e.,surface rigid sleeve valve pipe grouting,horizontal advance curtain grouting,pipe well dewatering,receiving end excavation,back pressure backfill) contained in it are elaborated and the characteristics of the technology are analyzed.Field practice results show that this technology is easier to operate than the conventional door steel ring receiving technology,and it combines a variety of mature technologies to reduce the risk of shield receiving,and realizes the disintegration of the structure inside the cave of deep buried shield in the water-rich sand and gravel mixed soil layer.The research has achieved good economic and social benefits.