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京九铁路是新开辟的连接北京和香港九龙的南北大动脉,1996年9月正式通车。其中江淮段指淮河与长江之间的306.1km区段,自河南淮滨站至湖北蕲春站。由于沿线地形复杂,降水强度大,路基坍塌成为安全运行的主要危害。据统计,1997-2007年间,发生各种坍塌灾害455次,毁坏路段总长约53000m。运用京九铁路江淮段地质资料、1997-2007年11a间所发生的路基坍塌资料和铁路沿线10个气象站雨量实况资料,对京九铁路江淮段地质地岩状况进行了分类,分级处理了不同地质条件下路基坍塌的发生频次和强度,详细分析了路基坍塌发生前24～72h雨量,得到诱发京九铁路江淮段路基坍塌灾害的地质条件和降水阀值,并对各种不同地质条件下发生路基坍塌的降水阀值及其超过阀值后灾害次数上升情况进行评述,绘制出京九铁路江淮段路基坍塌易发程度等级分区图,提出了相应的处治方法和系统图。可见不利地质条件与强降水共同作用是导致某些路段路基集中坍塌的根本原因。
The Beijing-Kowloon Railway is a newly opened north-south artery connecting Beijing with Kowloon in Hong Kong. It was opened to traffic in September 1996. The Jianghuai section refers to the 306.1km section between the Huaihe River and the Yangtze River, from Huai Bin Station in Henan Province to Hunchun Station in Hubei Province. Due to the complicated terrain along the route and the heavy rainfall intensity, the subgrade collapse has become the main hazard of safe operation. According to statistics, from 1997 to 2007, various collapses occurred 455 times and the total length of destroyed roads was about 53000m. Based on the geological data of Jianghuai Section of Beijing-Kowloon Railway, the collapse data of subgrade during 1997-2007 and the actual rainfall data of 10 meteorological stations along railway line, the geologic and geotechnical conditions of JAC-JAC are classified and graded differently The occurrence frequency and intensity of subgrade collapse under geological conditions are analyzed in detail. The rainfall amount before 24 ~ 72 hours before collapse of subgrade is obtained, and the geological conditions and the precipitation threshold are obtained to induce the collapse of the subgrade on the JAC-JAC subgrade. The slump threshold of subgrade collapse and the increase of the number of disasters after it exceeds the threshold are plotted, and the subdivision level of the grade of collapse of the subgrade at the Jianghuai Section of the Beijing-Kowloon Railway is drawn. Corresponding treatment methods and system diagrams are put forward. It can be seen that the adverse geological conditions and heavy rainfall together is the root cause of the concentrated collapse of roadbed in some sections.