气泡混凝土拓宽路基的沉降特性数值分析

基于FLAC^3D建立了气泡混凝土拓宽路基的数值分析模型,研究了不同施工阶段路基的沉降分布规律和发展过程,并分析了地基换填深度和老路开挖宽度对气泡混凝土＂应力置换＂效果的影响。研究表明：在老路荷载单独作用下,最大沉降发生在路基中心线处;在新老路基荷载的共同作用下,路基新增沉降在路基中心线处最小,在拓宽路基部分达到最大;拓宽路基的差异沉降随换填深度和开挖宽度的增大而减小。

Study on the Settlement Characteristics of Foam Concrete Widening Subgrade by Numerical Analysis

Based on FLAG^3D the numerical analysis model of bubble concrete widening subgrade was established, the subgrade settlement distribution low and development process in construction was studied, and the influences of excavation depth and excavation width to＂ stress replacement＂ effect of foam concrete was analyzed. Research shows that： under the old acting alone, the maximum settlement occurred in the emban km ent center line; under the load of new and old subgrade, the new settlement at center line of subgrade is minimum, while the maximum occurs at the part of the new subgrade ; the differential settlement decreases with the replacement depth and excavation width increases.