西南山区干线公路阻断状况研究

Blockade of Trunk Highway in Southwest Mountains Areas

针对西南山区的地理、地质、气候、水文和水文地质等特点,结合重庆市干线公路2007—2011年的阻断信息统计数据,采用统计分析方法,分析了西南山区干线公路交通阻断的主要特征、阻断原因、分布规律。分析结果表明:西南山区干线公路阻断的主要特征为原因种类多、阻断发生集中度高、累计影响大、阻断区域集中性强;阻断以突发性为主,发生率达到79.8%;一级阻断原因主要为地质灾害和恶劣天气,引发的阻断次数分别占阻断总次数的57%和19%;地质灾害对应的二级阻断原因主要是滑坡和泥石流,引发的阻断次数分别占到各类地质灾害引发的阻断总次数的33%和32%;恶劣天气对应的二级阻断原因主要是降雨,引发的阻断次数所占比重达68%;阻断高峰期分布在冬季和夏季,而每年1,6,7月的阻断次数最多且阻断影响较大,这3个月的阻断次数之和达到全年阻断总次数的50%以上;不同国道、省道的阻断状况存在较大差异,其中,G319国道上累计阻断次数最多。

For geography,geology,climate,hydrology and hydrogeology characteristics of southwest mountainous areas,the main features,blocking reasons and distribution law of trunk highway in southwest mountainous areas were analyzed by using the statistics database of blockade of Chongqing trunk roads from 2007 to 2011. The results show that various causes,blocking with a high concentration,great block accumulative influence and strongly concentrated of blocking regions are the main features of the blockade of trunk highway in southwest mountainous areas. And sudden blocking is the main style; the incidence of unexpected block is 79. 8%. The main causes of blocking are geological disasters and adverse weather conditions,accounting to 57% and 19% respectively of the total blockade numbers. The second main blocked cause of geological disasters blocking is landslides and mudslides,accounting to 33% and 32% of the total blockade numbers caused by various geological disasters. The second blocked cause of inclement weather is rainfall and the blocking event rate is up to 68%. And the peak of blocking occurs in winter and summer. Especially in January,June and July,the blocking occurs most frequently and the blocking effects are rather larger. The total blocking times in these three months are over 50% of the total times throughout the year. The blocking conditions of different state roads and provincial highways have great difference and the accumulative blockade numbers of route G319 is the most.