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攀(枝花)田(房)高速公路望江岭隧道右线出口段,穿越厚层第四系混合堆积层,由块石、块石夹(质)土、小块石夹(质)土、黏土质角砾、含角砾低液限黏土等交错堆积构成。厚度约0~33.9 m,成因复杂、松散、稳定性差,且隧道洞口段浅埋、偏压。为确保洞顶上方的108国道畅通安全,经综合比较,进洞方案以“先稳坡、后进洞”为指导原则,采用了土钉墙、抗滑桩板墙反压回填水泥混合土以及洞内支护加强等措施,成功实现了安全进洞。结果表明此进洞方案合理,可为类似工程提供借鉴及参考。
Panshi (Fanghua) Tian (Housing) Expressway Wangjiangling tunnel right exit section, through the thick Quaternary mixed accumulation layer, from rock, block stone (quality) soil, small stone clip , Clayey breccia, and brecciated low liquid limit clays. Thickness of about 0 ~ 33.9 m, complex causes, loose, poor stability, and the tunnel opening shallow section, bias. In order to ensure the smooth flow of the No. 108 National Highway above the top of the tunnel, after comprehensive comparison, the project of hole-entry adopts the guideline of “first steady slope and backward hole” and adopts the soil nailing wall and anti-slide sheet wall backfill cement mixed soil As well as strengthening of the tunnel support and other measures to successfully achieve safety holes. The results show that this hole program is reasonable and can provide reference for similar projects.