Research On The Safety Testing Evaluation And Repair Technology Aboat Post-Earthquake Subgrade Of Highway

Road is of the channel for rescue workers, disaster material and personnel evacuation, is a vital lifeline for relief after earthquake. After the Wenchuan and Yushu Earthquake, our country attaches great importance to the seismic damage detection and repair technology of highway.From the requirements of the paper and engineering practice, The main purpose of this paper focuses on the following: First, the highway subgrade seismic damage types, characteristics, on this basis to its failure mechanism and influence factors analysis; Second,the paper explore to make the rapid grading assessment of subgrade seismic damage by combination the Simple accurate Weighted Average Method and the Single Qualitative Weighted Score Method.who use the main subgrade seismic damage, slope seismic damage, retaining structure seismic damage as evaluation indexes; Third, selection the subgrade damage state, structural characteristics of subgrade(height, slope ratio), aftershock strength, terrain features, rainfall intensity as five ssessment indexs, the Fuzzy Comprehensive Evaluation Method introduced the comprehensive security assessment of post-earthquake subgrade; Fourth, establish the post-earthquake mechanical model of subgrade, through some basic assumptions, use the Limit Equilibrium Method analysis subgrade's stability; Fifth, take the situation of seismic damaged and safety evaluation of highway subgrade as the basis, taking into account the different needs of road transport on various stages after the earthquake, the highway subgrade damage repair measures were discussed.The results obtained in this paper, on detection of post-earthquake evaluation and repair of subgrade repair theory have positive value of the works.