Research conclusions ： Concrete compaction pile can effectively eliminate the moist and sinking of loess to reinforce the foundation. Hie buffer structure with open and cap brim type incline gate are adopted to the entry of the tunnel，which brings good buffering effect and meets the environmental requirement with good looking and integration of topographical features. But it is proposed to adopt typical design to the gate and buffering section so as to enhance the utilization coefficient of model loop wheel machine because there are lots of difficulties in construction of cap brim type Incline gate with low working efficiency and high cost of model loop wheel machine.