典型泥石流区公路桥涵毁损调查分析及防治对策

ANALYSIS OF BROKEN INVESTIGATION AND COMPREHENSIVE PREVENTION COUNTERMEASURES FOR HIGHWAY BRIDGE AND CULVERTS IN ACTIVE REGION OF DEBRIS FLOW

东格公路和S209线位于云南小江流域,沿线穿越泥石流区,且泥石流规模大活动性较强,对公路桥涵结构物威胁越来越突出。通过前期资料收集、现场调查分析山区公路沿线泥石流沟对公路桥涵结构的影响,提出公路泥石流区综合防治对策。结果表明:泥石流灾害对公路结构物危害大,桥涵毁损主要以冲刷、磨蚀及局部淤积的形式出现,局部基础部位(锥坡)和桥(涵)台部位受掏蚀、冲刷、掏蚀、淤埋而产生破损。研究结果对加强公路泥石流区路基、桥涵等结构设计和防治具有重要参考价值。

Dongge Highway and S209 Line are located in the Xiaojiang River Basin in Yunnan Province,and they pass through the debris flow area.The debris flow is large in scale and highly active,posing a growing threat to highway bridge and culvert structures.Based on the preliminary data collection and field investigation,the impact of debris flow gullies along the line on highway bridge and culvert structures is analyzed,and the comprehensive prevention and control measures for highway debris flow areas are proposed.The results show that the debris flow disaster is harmful to highway structures.The bridge and culvert damage mainly occurs in the form of erosion,abrasion and local siltation.The local foundation(conical slope)and bridge(culvert)abutment are damaged by erosion,scouring,erosion and siltation.The research results have important reference value for strengthening the design and prevention of subgrade,bridge and culvert and other structures in highway debris flow area.