强夯法加固无粘性土路基有效加固深度的研究

有效加固深度是强夯法设计施工的重要参数之一,目前尚缺乏深入的理论研究。文中结合现场试验,通过FLAC3D建立了强夯加固无粘性土的数值计算模型,分析了夯锤落距、锤重、锤底面积以及土体参数等因素对强夯有效加固深度的影响,并通过正交设计法进行了土体参数多因素敏感性的分析。根据分析结果以及结合有效加固深度的传统经验公式,提出了针对无粘性土的有效加固深度的计算公式。工程验证表明,所建立的计算公式预估结果比较可靠,对强夯法的设计与施工具有一定的指导作用。

STUDY OF THE DYNAMIC COMPACTION EFFECTIVE REINFORCEMENT DEPTH OF COHESIONLESS SOIL SUBGRADE

The effective reinforcement depth is one of the most important parameters of dynamic compaction method design and construction, so far it is still lack of in-depth theoretical study. In this paper combined with the field test, FLAC3D was used to do the numerical simulation of dynamic compaction reinforcement to cohesionless soil. By the simulation, this paper analyzed the factors which may influence the effective reinforcement depth, such as the hammer's weight, drop distance, base area, and the soil parameters. The orthogonal design method was used to analyze the soil parameters' sensitivity to the effective reinforcement depth. Combined with the results of numerical analysis and the traditional empirical formulae, the effective reinforcement depth calculation formula was established for cohesionless soil. The engineering verification shows that the established calculation formula is more reliable and has a certain guiding effect on the design and construction of the dynamic compaction method.