复合地基在湿陷性黄土桥基中的应用研究

【作者】 张建立；

【导师】 谢永利；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2001， 硕士

【摘要】 黄土地区的高等级公路建设中经常遇到湿陷性黄土问题，其病害类型主要是地基土受水浸湿后引起路基、桥台、涵洞等的不均匀沉降，直接影响路基、构造物等的正常使用。针对此问题，本文依托甘肃谗口至兰州柳沟河高速公路建设工程，对桥基灰土桩复合地基应用的可行性进行了深入分析，根据具体工程进行了合理的设计与计算，并配合现场静载荷试验及压力盒实测数据，探讨了基底应力分布规律，桩土应力比，变形模量的变化关系，对比分析了单桩、单桩复合和双桩复合的P—S关系，对桥基灰土桩复合地基承载力进行了整体评价。现场检验表明，本文提出的采用灰土桩处理桥基湿陷性黄土地基是可行的。更多还原

【Abstract】 The collapsible loess is often met during the construction of the high-grade highway in the loess area, and the main failure is the uneven subsidence of the roadbed and the culvert, which affects the safe usage of the roadbed and the culvert, etc. Directed against this, based on the Chankou-Lanzhou freeway construction, the paper analyzes the application of the composite ground formed by lime-soil pile under the bridge and designs the project, discusses the rules of the contact pressure, the stress ratio of the pile and the soil, compares the P-S curves of one pile, the composite ground formed by one pile and the composite ground formed by two piles based on the in-situ plate loading test, evaluates the bearing capacity of the composite ground of the project. The in-situ test result shows that using the lime-soil pile to treat the collapsible loess under the bridge is feasible.更多还原