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为了研究双侧加宽道路改建中路基差异固结沉降规律及由此引起的路基纵向开裂机理,运用Biot固结理论和离心加载法进行了数值模拟与分析。发现随着超静孔隙水压力的消散,新旧路基结合部处不均匀沉降逐渐增大,路基顶面为拉应力区,中下部为剪应力区。路基开裂实际上是新旧路基结合部土体损伤产生→扩展→汇合的整个过程。工程中除对地基进行主动处理外,还需加强对新旧路基结合部的被动性处治。
In order to study the law of subgrade consolidation and settlement and the longitudinal cracking mechanism of subgrade caused by double-widened road reconstruction, the Biot consolidation theory and centrifugal loading method were used to carry out numerical simulation and analysis. It is found that with the dissipation of the excess pore water pressure, the uneven subsidence at the junction of old and new road subgrades gradually increases. The top of subgrade is the tensile stress zone and the middle and lower are the shear stress zone. Subgrade cracking is actually the whole process of soil damage → extension → convergence of the old and the new subgrade. In addition to active treatment of the foundation, the need to strengthen the passive treatment of old and new subgrade combination.