1 前言由于地方建设的需要及铁路提速、线路全封闭全立交的实施,公铁立交工程大量采用顶进下穿式箱形框构方式来实现。沪宁线镇江丹阳-常州奔牛段在地貌单元上为第四纪全新世冲积层,沿线地基土除上部厚1．0m左右的填土层 1 Preface Due to the need of local construction and the speeding up of railway and the implementation of fully enclosed and overpassed lines, the overpass project of public transport interchanges has been largely implemented in a jack-in-box approach. Shanghai-Nanjing line Zhenjiang Danyang - Benniu Changzhou geomorphic units in the Quaternary Holocene alluvial layer, along the foundation soil except the upper part of the thickness of about 1.0m of soil layer