Safeguard Research And Safety Evaluation Of The Helix Line Development In Shui(Fu)Ma(Liuwan) Highway

When the natural developments and long tunnes are unable to overcome the elevation difference between the control points, Helix line development begins to receive attention because it has better line conditions than back development and the potential of meet mountain highway alignment. The Laobaoshan Helix line development of Shui-Ma Highway is the first attempt of Helix line development in our country. In order to avoid the Shui-Ma Highway of Laobaoshan Helix line development's potential dangers and improve the safety, the author researchs the results of the Shui-Ma Highway of Laobaoshan Helix line development's safety evaluation.Basing the 's technique of the operting speed forecast, the paper advices the operating speed's evaluation technique, combineing with the Helix line development's specialty. The technique includes the speed correcting considering the tunnel and the cross section's effect and the evaluation standard of the operating speed gradient. Then, the paper forecasts the evaluated road's operating speed. By evaluating the alignment's consistency, the paper concludes that the road has a good alignment's consistency. Accoding to the results of the forecasting operating speed, the paper evaluates the alignments(including horizontal alignment,vertical alignment,sight distance,continuous downgrade,continuous upgrade and so on),traffic facilities and so on.of the Helix line development's road. By the evaluations, the paper finds out the potential dangers of the road and project measures and manage measures. At last, by the analysis of the potential dangers and the causes of the dangers, the paper presents the disaster prevention measures. Then ,the paper bulds the master plans of three especial accidents: serious traffic accident,dangerous goods transport and tunnel fire hazard. The plans including the emergency measures,emergency rescue program,administration's structure and action program and so on.