Safety Risk Assessment Of Loess Slope Construction In Tianyong Expressway

Nowadays,under the background of accelerating the construction of internal circulation in my country,the development of transportation is particularly important.With the higher requirements for the quantity and quality of highway construction,safety issues during construction have also received more and more attention..As one of the most common construction projects in expressways,slope engineering plays a vital role in construction safety,especially loess slope engineering,because of its complex geological structure,which makes construction more difficult,so the construction of loess slopes is difficult.Safety risk assessment is particularly important.There are many risk factors in loess slope construction,which can lead to casualties,economic losses,and project delays.Therefore,scientifically and rationally evaluating the construction safety of expressway loess slopes,making timely and targeted decisions,and improving protective measures can effectively improve the safety level of expressway loess slope construction and have practical value for expressway construction.Combined with the slope construction of Tianyong Expressway,this paper takes the geological characteristics of loess slope as the breakthrough point,systematically analyzes the morphological characteristics,failure types and mechanism of loess slope,and explores and analyzes the external and internal influences that affect the safety of loess slope implementation engineering.factor.According to the index selection principles of comprehensiveness,representativeness,scientificity and practicability,a safety risk evaluation index system of loess slope construction of Tianyong Expressway is constructed,which consists of 5 secondary indexes and 24 influencing factors.Multi-level and targeted consideration of the safety risks during the construction of the loess slope of Tianyong Expressway.Experts in related fields are invited to score each index according to the scoring criteria,and use the combination of AHP and entropy weight method to give weights to calculate the comprehensive weights of different index factors,finally determine the membership function,and establish an effective fuzzy comprehensive evaluation matrix.A complete set of safety risk assessment model for loess slope construction of Tianyong Expressway is formed.Ranking the risk indicators,it is concluded that personnel and equipment factors are the risk factors that most affect the construction safety of loess slopes.The evaluation results of other risk factors are as follows: construction safety management,slope topography,rock and soil geological conditions,meteorological and hydrological conditions It is moderate risk;personnel and equipment factors are high risk;the overall risk level is moderate risk,which is consistent with the actual situation,which proves that the model is practical.Corresponding suggestions are put forward around the evaluation results,which will provide help for the subsequent construction of the loess slope of Tianyong Expressway,and also provide reference for similar projects.