高速铁路隧道超浅埋下穿高速公路设计研究

厦深铁路红棉隧道为设计时速250 km高速铁路双线隧道,隧道洞身以小角度超浅埋下穿水官高速公路和盐排高速公路,隧道埋深分别为6.5~11 m和2.5~4.3 m。通过对国内大断面隧道工程下穿高速公路有关科研、设计和施工情况的调研,结合红棉隧道具体条件,对红棉隧道暗挖法、贝雷桥过渡+暗挖法及盖挖法下穿高速公路技术方案进行研究。通过比选,红棉隧道下穿水官高速公路采用超长管棚+双层初期支护结构的暗挖法技术、下穿盐排高速公路采用地下连续墙+钢筋混凝土盖板的盖挖半逆作法技术,保证工程的顺利实施和高速公路的运营安全。

Design Research on Super Shallow-buried High-speed Railway Tunnel Passing under Highway

Hongmian high speed railway double-track tunnel designed for 250 km / h speed on Xiamen-Shenzhen railway line traverses under Shuiguan highway and Yanpai highway in a small angle with burial depth 6. 5 ~ 11 m and 2. 5 ~ 4. 3 m respectively. Based on the study of civil large section tunnels passing under the highway and in view of the specific conditions of Hongmian tunnel,this paper focuses on the study of Hongmian tunnel in perspective of under-passing method,bailey bridge's transition & mining method,and cut and cover method. Through comparison and selection,cut and cover method with pipe shed and double primary support is employed to pass under Shuigong highway; semi-reverse method with underground diaphragm wall and reinforced concrete cover plate is accepted to pass under Yanpai highway. These methods ensure successful engineering and normal operation of highway.