大断面隧道特殊地质段贯通技术

Transfixion Technique of Special Geological Section of Large Section Tunnel

昆明绕城高速东南段杨林隧道右幅因受工期控制及涌水突泥因素影响,隧道贯通只能选定涌水突泥影响段附近,风险较高。在贯通条件不利情况下,通过采用小导洞方式施工进口涌水突泥段,斜井作业面采用三台阶法减小开挖空间,并采用超前预加固措施进行加强,保证了隧道在特殊地质段贯通施工安全,按期实现了隧道贯通,成功降低了施工潜在风险,该方法为隧道在特殊地质段实现安全贯通提供了思路,效果良好。

The right line of the Yanglin Tunnel in the southeast section of Kunming Ring Expressway is affected by the duration control and the mud inrush from the working face. The tunnel’s transfixion face can only be selected near the affected section of the mud inrush,and the risk is high. Under the unfavorable conditions of through-construction,the construction of the inrush mud section is carried out by using a small guide hole. The inclined well working face adopts the three-step method to reduce the excavation space and the pre-reinforcement measures are used to strengthen the tunnel,ensure the special geological section of the tunnel safety through,the tunnel is connected on time,and the potential risk of construction is successfully reduced. This method provides a way for the tunnel to achieve safe penetration in a special geological section. It is practically available and has good effects.