基于动力触探指标的土层力学分层及分形研究

Study on Mechanical Stratification and Fractal of Soil Horizon Based on Dynamic Penetration Index

动力触探是岩土工程勘察中一种常用的勘察手段,动力触探常用指标为锤击数。利用锤击数并根据超前滞后关系对玄武岩残积土进行力学分层,确定分层界线,分析土层性质。锤击数具有非线性特征,利用分形理论对锤击数进行关联维数计算。结果表明:嵌入维数为1时锤击数具有分形特征,且关联维数值随锤击数增加呈先增后减的趋势。

Dynamic penetration is an effective mean for geotechnical investigation, and blow counts is the commonly used with dgnarnie pentration index. For basalt residual soil, with this index and lead-lag relationship, both mechanical stratification was carried out and the stratigraphic boundary determined to analyze the properties of soil horizon. The blow counts has nonlinear feature, and the correlation dimension in respect of blow counts may be calculated by means of fractal theory. The result shows that, when the embedding dimension is 1, blow counts possesses fractal characteristics, and the correlation dimension thereof increases firstly and then decreases as the blow counts increases.