风积沙地区公路隧道施工方案研究

为积累风积沙地区公路隧道施工经验,以榆神高速神木1号隧道工程为依托,对该隧道在风积沙段施工中采用的3种施工方案进行了详细介绍,并采用数值模拟和监控量测手段,同时结合现场施工情况,对3种方案的沉降控制效果、施工技术难度和施工周期等进行了对比研究。总结出了其各自的适用条件:小导管+上下台阶临时仰拱法适用于工期紧张,需要快速施工且对地表沉降没有严格控制要求或允许较大地表沉降的场合;水平旋喷桩+三台阶临时仰拱法适用于对地表沉降有严格控制要求的场合;大管棚+上下台阶临时仰拱法在介于上述情况之间时适用。

Study on Construction Programs of Highway Tunnels in Aeolian Sand Areas

Three construction programs adopted in the construction of No.1 Shenmu Tunnel on Yulin-Shenmu expressway are presented in detail in order to accumulate experiences in the construction of tunnels in aeolian sand areas.The settlement control results,the difficulties in the construction technologies and the construction periods are comparatively studied by means of numerical simulations and monitoring.Conclusions drawn are as follows： 1） ＂small duct ＋ top heading/bench ＋ temporary invert＂ method is applicable for cases in which rapid construction is needed due to the tight construction schedules and there are no strict requirements on the settlement control;2） ＂horizontal jet grouting pile ＋ top heading/two benches ＋ temporary invert＂ method is applicable for cases in which there are strict requirements on the settlement control;3） ＂large pipe roof support ＋ top heading/bench ＋ temporary invert＂ method is applicable for cases in between.