一、84.7.1泥石流简况 1984年7月1日21点45分,成昆线k305+038公里处的勒古洛夺沟在暴雨的激发下,暴发了一场运营以来较大规模的泥石流(以下简称7.1泥石流)。汹涌的泥石流在堆满了同年5月20日才竣工的两道混凝土片石和浆砌片石拦碴坝后继而翻坝而过,流面在距梁底10厘米高 I. 84.7.1 Briefing on Debris Flow At 1:45 on July 1, 1984, Le Guluoshuou at k305 + 038 km into Cheng-Kun Line triggered a large-scale debris flow triggered by the torrential rain Hereinafter referred to 7.1 debris flow). Rough debris flow in the river filled with the same year on May 20 only completed two concrete slabs and mortar stone ballast dam and then turn the dam over the flow surface at a distance of 10 cm from the bottom of the beam