冻土路基微动探测方法应用探讨

Application and Discussion of Microtremor Survey for Frozen Soil Roadbed

以哈尔滨某高铁路基勘探为例,采用空间自相关方法提取微动信号频散特征,获取地下150 m介质的横波速度结构及分层特征。结果表明,微动方法可穿透冻土区较厚的覆盖层探测基岩面,且分层界面与钻孔资料一致。该方法施工便利、适用性强,结合钻探资料可精确刻画地下地质层位分布,减少钻探工作量,节约经济成本,具有较高的应用价值和科学意义。

Taking high-speed railway exploration in Harbin as an example,we use the spatial autocorrelation method to extract microtremor signal dispersion characteristics,then obtain shear wave velocity structure of the underground 150 m medium and its layering features.The results show that the microtremor method can penetrate thicker overburden to detect the bedrock surface,and the formation interface is consistent with the borehole data.This method has convenient construction and strong applicability.Combining it with drilling data,we can accurately describe the underground geological horizon distribution and reduce the drilling workload.It saves economic costs and has high application value and scientific significance.