某风积沙隧道施工方案应用总结

Summary of Application of Construction Scheme for An Aeolian Sand Tunnel

在千松坝隧道风积沙段开挖过程中,通过对"超前小导管注浆+四台阶法"、"超前大管棚注浆+三台阶临时仰拱法"和"水平旋喷桩+台阶临时仰拱分部开挖法"三种施工方案的摸索和实践,总结出适合风积沙隧道开挖的施工方案,并对各方案的收敛性等进行分析,以利于推广应用。

During the excavation process of aeolian sand section of Qiansongba Tunnel, the construction scheme that is suitable for aeolian sand tunnel excavation is summarized through the exploration and practice of three kinds of construction schemes like " advanced small pipe grouting + four - step m ethod" , " advanced large pipe shed grouting + temporaryinverted arch method for three - step" and " horizontal je t grouting pile + partial excavation method for temporary inverted arch of step" , and analyses on the convergence and so on of each scheme are made, so as to fa cilitate the promotion and application.