湿陷性黄土地基处理原理主要是破坏湿陷性黄土的大孔结构，消除地基的湿陷性。同沿高速公路部分路段处于湿陷性黄土地带，为确保路基及构造物的安全和正常使用，对非自重湿陷性黄土地基采用冲击碾压法进行填前处理，使地基满足承载力与稳定的要求。介绍了该路段采用冲击碾压法进行地基处理的原理、施工方法和质量控制措施。

 The basic principle for the consolidation of the wetsubsidence loess subgrade is to destroy the macroconfiguration of the wetsubsidence loess so as to eliminate the wetsubsidence feature. Some portions of TongYan highway are located in wetsubsidence loess zones. In order to guarantee the safety and normal performance of the subgrade and structures of the highway, impaction and compaction method is adopted to consolidate the subgrade consisting of nongravity wetsubsidence loess before backfilling so that the subgrade can meet the requirements in respect of bearing capacity and stability.