高炉渣粉煤灰地基回填料的强夯数值模拟

Numerical simulation of dynamic compaction on blast furnace slag fly ash for foundation backfill

为了研究高炉渣粉煤灰作地基回填料的强夯性能及效果,进行了对该类人工填料地基的强夯数值模拟以及夯后地基沉降的观测。依托某钢铁企业新体系高炉矿渣地基处理项目,构建拟静力法下夯锤与土体之间的接触力求解模型,并基于FLAC^(3D)软件,模拟高炉渣粉煤灰地基强夯过程中的地基土瞬时沉降变化,并对夯后地基土力学性能进行分析。结果表明:强夯高炉渣地基的最佳点夯次数为6~7次,强夯加固深度约为6 m。依据强夯施工后的沉降观测,分析该类地基强夯后土体的沉降变形特性及密实效果,为同类研究提供参考。

In order to study the dynamic compaction effect of the blast furnace slag fly ash which is used as foundation backfill,a numerical simulation of compaction on the artificial filling foundation and an observation on the foundation settlement have been carried out. Based on a foundation treatment project for the new blast furnace slag in a steel enterprise,a model for the contact stress between rammer and soil is established pseudo-statically. Using the software FLAC^（3D）,we simulate the instantaneous settlement of blast furnace slag fly ash foundation in the dynamic compaction process of the foundation and analyze the mechanical properties of the foundation soil after ramming. The following conclusions have been obtained： the optimal tamping times of the dynamic compaction on blast furnace slag foundation is 6 ~ 7,and the dynamic compaction depth is about 6m. Based on settlement observation after the dynamic compaction,the settlement characteristics and compaction effect of the foundation soil after compaction have been analyzed,which provides reference for futuresimilar researches.