To make sure the safety and stability of the subgrade, karst grouting tests were conducted to the subgrade in section DK1003 ＋555.0 - DK1003 ＋ 751.7 of Shanxi＇ s central south railway passage and after the grouting, high density resistivity method exploration was used to evaluate subgrade grouting effect. The resuh shows that the corrosion, cavities, fractures and heterogeneous bodies all get filled in different extent, thus the grouting method is feasible with its obvious effects and can be of spreading application in karst sections of Shanxi ＇ s central south railway passage.%为确保路基的安全和稳定，选择山西中南部铁路通道DK1003＋555．0～DK1003＋751．7段路基进行了岩溶注浆试验，在注浆后采用高密度电法勘探进行了岩溶注浆效果的评估，结果表明，溶蚀、空洞、裂隙、不均匀体均得到了不同程度的充填，采用的注浆措施可行、灌浆效果比较明显，可以在山西中南部铁路通道岩溶地段推广运用。
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