摘要
以北京新机场高速公路地下综合管廊暗挖下穿新凤河为例,针对覆土浅、三联拱、富水、地质条件差等特点,对三联拱浅埋暗挖综合管廊下穿富水河道可能产生的风险及原因进行分析,提出在采取河道围堰渡管导流、隔离桩等技术措施的基础上,采用超前小导管与深孔注浆结合台阶法的开挖方案.经现场监测表明,该方案能有效防止渗漏水及塌方风险,保证综合管廊施工安全的同时,加快了施工进度.
Taking the utility tunnel of Beijing New Airport Expressway as an example to excavate through the Xinfeng River,for the characteristics of shallow overburden,triple arches,rich water,and poor geological conditions,this paper analyzes the possible risks and causes of the triple arch shallow buried underground comprehensive pipe gallery crossing the water rich river course.Based on technical measures such as river cofferdam crossing pipe diversion,isolation piles,and other technical measures,a small-diameter pipe and deep-hole grouting combined with the step method is adopted for excavation.On-site monitoring shows that the scheme can effectively prevent the leakage and landslide risks,while ensuring the safety of the construction of the integrated pipe gallery,and speeding up the construction progress.
作者
胡平
HU Ping(Beijing BII Transportation Development Co.,Ltd.,Beijing 102606,China)
出处
《施工技术》
CAS
2021年第7期94-98,103,共6页
Construction Technology
关键词
综合管廊
浅埋暗挖
富水河道
超前支护
施工技术
风险
utility tunnel
shallow buried covered excavation
water-rich river
advance support
construction
risk
