浅埋偏压、软弱围岩双线客运专线隧道施工综合技术研究

Construction Technology of Unevenly-pressured Shallow Soft Rock Tunnel in Passenger Dedicated Railway

以武广客运专线狮公岩二号隧道为工程背景,针对该隧道埋深浅、偏压显著、围岩软弱破碎、受降雨影响大、隧道断面大、施工变形大且控制困难等特点,基于浅埋偏压显著段隧道大变形原因分析,提出了地表网喷加固、洞内加长锚杆、增设水平横撑的应急措施,在隧道变形初步控制后,进一步采取地表坡顶减负、坡脚反压增阻,以及局部锚固桩等措施,有效控制了隧道变形,保证了隧道施工安全,并成功保护了地表构筑物。

Based on Sigongyang 2nd tunnel of Wuguang passenger transport railway line,according to characteristics of the tunnel,such as unevenly-pressured shallow depth,soft surrounding rock,influenced distinctly by rainfall,big tunnel cross-section,large tunnel deformation,and so on,this paper studies the construction control technology of the tunnel,including emergency measures such as shotcrete on ground,longer rock bolt in tunnel and horizontal braces,and farther control methods such as reducing stress on ground and additional resistance in side slope and slide pile.