黑滩隧道洞口偏压进洞处治技术

Treatment Techniques for Heitan Tunnel Entrance Construction in Partial Pressure

在绵茂公路黑滩隧道进口浅埋偏压段施工中,为避免洞口塌方,采用了延长明洞,在洞口明洞段分段采用桩基托梁、基础注浆的方式承载偏压墙,水泥稳定碎石土分层回填拱部,然后采取管棚支护、单侧壁开挖、围岩量测等技术措施进洞,结果表明上述施工技术能够安全、有效地解决进洞问题。

During the construction of Heitan tunnel entrance section which is shallow buried and in partial pressure in Mianmao road, the open-cut tunnel is proposed to be extended, pile foundation underpinning and foundation grouting are used to sustain partial pressure wall at entrance section, cement-stabilized aggregate is used to backfill the arch section is layers, and entrance construction techniques such as pipe roofing support, single side excavation, surrounding rock monitoring are used to prevent collapse at tunnel entrance. It is proved that the construction techniques can solve tunnel-entering problems safely and efficiently.