高密度电法在枣庄某建设场采空区注浆效果检测中的应用

在山东省枣庄市某棚户区改造项目前期的岩土工程勘察和物探勘查中,发现部分建筑物及车库基础下存在采空区及采煤巷道。根据前期工作,对其中一条巷道进行了注浆处理。处理后,利用高密度电阻率法对注浆位置进行了物探勘查,认为该处注浆后视电阻率升高,原低阻异常区明显减小或者消失,注浆采空区与未注浆采空区有明显的电性差异,未注浆区的明显低阻异常为分辨注浆区位置和效果提供了对比参考。但在使用电阻率法对注浆区进行检测时,要保证水泥浆固结,否则无法有效区分原充水采空区及未固结水泥浆引起的视电阻率异常,不利于判断注浆效果。因此,用物探方法检测注浆效果,可为工程顺利施工提供相应的参考依据。

Application of High Density Resistivity Method in Detecting Grouting Effect in Mined out Area in a Construction Area

After geo-engineering investigation and geophysical exploration in a shanty town reconstruction project in Zaozhuang city of Shandong province, it is showed that there are some mined out areas and mining roadways under the foundation of some buildings and garages. According to the results and recommendations of the previous work, a already found tunnel has been grouted. After the treatment, by using high density resistivity method, it is found that the apparent resistivity increased, the original low resistivity anomaly area significantly reduced or disappeared, the goaf grouting and non grouting in goaf has obvious electric differences. Non-grouting area has an obviously low resistivity. It has provided comparison and references for grouting effect. But when the detection of grouting is carried out by using the resistivity method, the cement slurry consolidation should be ensured, otherwise, the data gained from the interpretation of the results will be affected. The apparent resistivity can not effectively be distinguished whether is is caused by the original water filling goaf or by unconsolidated cement. This method can provide some references for construction of the project.