经野外实地调查,5.23沪昆铁路脱线事故,是由于之前连降雨,使事发区上部风化土层含水极度饱和,停雨后土体排水不均,而事发现场铁路上部有两条坡度较陡,约65°,致使上覆土层厚度为10m左右的浅红色粉质粘土滑坡,造成19人死亡,71人受伤,坍塌泥石8000余m3。 After field investigation, 5.23 Shanghai-Kunming railway off-line accident was caused by previous rainfall, which made the water content of the upper weathered soil in the incident area extremely saturated. After the rain stopped, the soil was drained unevenly. There were two slopes in the upper part of the scene Steep, about 65 °, causing a light red silty clay landslide with an overlying soil thickness of about 10m, killing 19 people, injuring 71 and collapsing more than 8,000 m3 of debris.