Study On Safety Risk Assessment And Protection Measures Of Subgrade Along River In Mountainous Areas

Subgrade along the river in mountainous areas is the most frequently damaged type of highway,and its erosion and water damage are a common type of disaster,posing a huge threat to the safe operation of highways along the river in mountainous areas and the ecology along the line.Relying on the scientific and technological innovation demonstration project of Yunnan Provincial Department of Transport,this paper uses Midas GTS NX software,tests and experimental data to analyze and study the factors affecting the safety of mountain riverside subgrade,and obtains the degree of impact of different factors on the safety of mountain riverside subgrade.Based on the fuzzy comprehensive evaluation method,this paper establishes a risk assessment model for mountain riverside subgrade safety,and proposes corresponding mountain riverside subgrade protection technologies,Intended to ensure the safety and economic and environmental protection of the subgrade along the river in mountainous areas.The details are as follows:(1)Based on the current research status at home and abroad,it is summarized that the main causes of water damage are erosion damage caused by rainfall and rivers.According to the subject analysis method,the disaster body is mainly the engineering structure itself,and the disaster causing body is mainly natural factors;Analyze the safety risk influencing factors through finite element software,experiments,and related experimental data,and conduct sensitivity analysis on the above factors to determine the degree of impact of each influencing factor on subgrade safety.(2)Select engineering factors and natural factors as primary indicators,and use subgrade form,slope,slope length,top width,soil type,rainfall intensity,rainfall duration,confluence speed,river flow velocity,and river depth as secondary indicators to establish a safety risk assessment system.Calculate the weights and membership degrees of the above influencing factors using the fuzzy comprehensive evaluation method,and divide the results into safety risk levels based on the principle of maximum membership degree,A risk assessment model for the safety of subgrade along rivers in mountainous areas has been established.(3)Based on the summary and analysis of the destruction of subgrade along rivers in mountainous areas,as well as the classification of flood damage in this article,combined with the key indicators of weight calculation,different protective measures are taken for different slopes,river flow rates,and confluence speeds,forming a set of protective technical guidelines.Based on the basic principles of subgrade protection along rivers in mountainous areas,technical measures for slope toe and slope surface protection,as well as non engineering protective technical measures,are proposed.(4)The established safety risk assessment model and protective technical measures for subgrade along rivers in mountainous areas were applied to the river sections of Gudong Autonomous Highway in Tengchong City,Yunnan Province.11 river sections were selected for safety risk assessment through field investigation,and the assessment results were close to the actual engineering situation;According to the damage situation of different sections,a riverside section in the study area is selected as the support,combined with the weight key indicators,mortar rubble is used to cooperate with apron protection,and finite element software is used to conduct modeling analysis.It is concluded that the protection scheme has obvious effect on slope toe protection,and improves the Factor of safety from Level IV unsafe state to Level I safe state;And based on technologies such as Spring Boot framework,Shiro safety control,and Thymlea template,a safety warning system for mountainous riverside subgrade has been constructed as a non engineering protection measure.