中文摘要：

结合山西横泉水库湿陷性黄土坝体的强夯法加固工程实际,利用钻探取样,结合室内烘干法、单线法、三轴CD试验测得不同深度土体的干密度、湿陷系数、强度值,并以此与强夯前土样特性进行对比,得到实测有效加固深度。对强夯湿陷性黄土的有效加固深度的定义、计算方法及其适用性进行了探讨,将实测结果与现有计算方法所得结果进行对比。结果表明：①当影响深度折减系数取0.3时,M enard公式计算值与实测值基本相符;②利用钻探取样法结合室内试验获得的相关参数来确定有效加固深度是可行的。

英文摘要：

Combining the reinforcement project of collapsible loess dam of Hengquan Reservoir in Shanxi Province by dynamic compaction,we obtained the dry density,coefficient of collapsibility,strength of soil samples drilled at different depths by indoor drying method,single-line method and triaxial CD tests,and compared them with the ones before dynamic compaction.By the comparison,the measured effective consolidation depths are determined.We discuss the definition,calculation methods and their applicability of the effective consolidation depth of collapsible loess by dynamic compaction,and compare the experimental results with the calculated ones by existed formulas.The results show that when reduction coefficient of effective depth equals to 0.3,the results of Menard formula are basically consistent with the measured values;it is feasible to determine the effective consolidation depth using relevant parameters of drilled samples determined by laboratory experiment.