机械振动影响下微动勘探技术在黄土填方地基勘察中的应用

Mechanical Vibration Application Under the Influence of Microtremor Survey Technology in Loess Filling Foundation Investigation

为研究机械振动影响下微动台阵剖面法在黄土填方地基勘察中的应用,以西北黄土填方场地上的某金属冶炼厂为例,在厂区机械正常运转产生的背景噪音影响下,使用多次覆盖线性微动台阵剖面法对该场地进行了探测,在部分点位进行钻孔,将岩样与微动探测结果联合分析对地基进行地质解释;同时在微动探测地质异常区再次进行钻孔,对地质解释推断结果进行验证。结果表明:采用多次覆盖线性微动台阵剖面法采集数据,并使用SPAC法结合地震勘探中的剥层反演法处理数据,可有效减小机械震动产生的背景噪音影响,该方法适用于机械振动背景噪音影响下的黄土填方地基勘察;原地基粉土在富水情况下横波速度会明显降低,微动探测技术可用于西北黄土填方场地地基富水区域的探测。

In order to analyze the application of microtremor array profile method in loess fill foundation investigation under the influence of mechanical vibration,a metal smelting plant in northwest loess fill site was taken as an example.Under the influence of background noise generated by normal operation of machinery in the plant area,multiple coverage linear microtremor array profile method was used to detect the site,drilling was conducted at some points,and rock samples and microtremor detection results were combined to analyze the geological interpretation of the foundation.At the same time,drill again in the geological anomaly area of micro motion detection to verify the geological interpretation and inference results.The results are as follows.The data are collected by multiple coverage linear micro-array profile method,and processed by SPAC method combined with the seismic exploration of stripping inversion method,which can effectively reduce the influence of the background noise caused by mechanical vibration.This method is suitable for the investigation of loess fill foundation under the influence of mechanical vibration background noise.The shear wave velocity of the floury soil in the original foundation will decrease obviously in the water-rich condition.The micro-motion detection technology can be used to detect the water-rich area of the loess filling site in northwest China.