上海软土地基路桥过渡段沉降分析及治理方法研究

Analysis and Management Methods for the Road and Bridge Transition's Sedimentation on the Soft Clay ground in Shanghai

针对近年来上海市重大市政桥梁工程桥头跳车的原因和产生的危害进行了分析,研究采用预沉法、减沉法和综合法处理路桥过渡段差异沉降的机理,总结了路桥过渡段沉降特征和变化规律,认为处理路桥过渡段沉降应根据具体地基条件、桥台结构形式、施工技术、工期要求等影响因素采取相应的地基加固方法,才能取得预期的效果.探讨了不同地基加固方法所适用的范围和条件.结合具体工程实例,提出了路桥过渡段差异沉降地基处理的关键问题和措施,获得了路桥过渡段沉降变形观测数据,并对各种加固方法的技术经济指标进行了对比分析.

The causes of vehicle jumping at the bridgehead and the induced endangerment of Shanghai major municipal bridge project in recent years are analysed. The authors study on the mechanics of the treatment to transition section between bridge abutment and embankment with the measures of preeompression, re- ducing subsidence and comprehensive measure, also summarize the settlement character and variation law of treating with bridge-approach, and figure that it is better to adopt proper methods of foundation reinforce- ment according to influencing factors of treating brigde-approach such as the conditions of foundation, abut- ment structural configuration, construction technique and schedule requirements-for expected effect. The scope and conditions of the different methods of foundation reinforcement are probed,too. Combining with specific examples of projects,the key issues and measures of foundation treatment to the bridge-approach are presented,and technological and economic indicators of all kinds of methods of foundation reinforcement are comparatively analysed.