云南串佛项目轿顶隧道

　　中交二公局承建的昭通至乐山高速公路串佛段轿顶隧道长12615米（左洞6318米，右洞6307米），为本条线路控制性工程。隧道围岩裂隙发育、复杂多变、涌水频发、岩爆突出，并穿越煤系地层，瓦斯多段落溢出，施工难度大、安全风险高。
　　The 12615m long (6,318m of the left hole and 6307m of the right hole) Zhaotong-Leshan Expressway Chuansi-Foeryan Mt. Jiaoding Tunnel was constructed by CCCC Second Highway Engineering Co., Ltd. and is the controling project of this line. Thanks to the complex and changeable tunnel surrounding rock fissure development, frequent water gushing, rock burst outburst through the coal stratum, gas overflow in many sections, thus, the construction is difficult, and in a high safety risk.