研究目的：昆明南连接线高速公路第三标段罗衙村主线桥地处滇池断陷盆地深厚软土地区，通过对罗衙 村主线桥工程病害的案例进行分析研究,总结提出深厚软土地基条件下桥梁工程病害防治的措施建议,为今 后深厚软土地基桥梁设计施工提供借鉴。
研究结论:（1)深厚软土地基负摩阻对桥梁施工、运营安全的影响较一般软土地基更加敏感，设计中一定 要充分考虑负摩阻的影响,并且要充分考虑施工、运营以及后续土地开发中不平衡堆载或减载的不利影响；(2)深厚软基桥梁工程设计要充分考虑施工便道等必要的基本设置，并且对周边场地环境可能产生不利影响 的工程活动作出严格明确的限制说明；（3)本研究成果适用于深厚软土地区桥梁工程的设计、施工以及工程 建成后的使用安全和周边土地开发，也可为深厚软土地基场地中其他工程的安全施工提供借鉴。

Research purposes ： The main line bridge through Luoya Village in the third tenders of Kunming Nan highway connecting is located in deep soft soil area of the Dianchi rift basin. Through analysis of the disease case of main line bridge through Luoya Village，this paper proposes measures and suggestions to control engineering disease of the deep soft soil foundation bridge，to provide a reference for the design and constmction of deep soft foundation bridge in the future. Research conclusions ：(⑴ The influence of negative frictional resistance in deep soft soils on bridge construction and operation safety is more sensitive than general soft foundation， so this must be fully considered in the design，and the adverse effects of unbalanced load or load shedding must be fully thought about in the process of construction，operation and subsequent land development. (2) The design of deep soft foundation bridge must fully consider the necessary basic settings such as constriction road，and the engineering activities that may have adverse effects on the environment of the surrounding area will be strictly limited in design notes. (3) The research result is suitable for bridge engineering design， constriction，security protection and surrounding land development in the deep soft soil area，also provides a reference for the safety constriction of other engineering in deep soft foundation space.