作　　者： ; ; ; ;

机构地区： 东南大学土木工程学院

出　　处： 《建筑结构》 2013年第19期90-94,68,共6页

摘　　要： 为了研究根式基础的水平承载性能,采用单向单循环慢速维持荷载法,在马鞍山长江大桥施工现场开展了两期根式基础水平静载试验。试验得到了普通沉井基础和根式基础的水平临界荷载、水平极限荷载、水平荷载与水平位移关系、变形特性等成果。试验结果表明:根式基础水平承载性能优于普通沉井基础。植入根键能显著提高普通沉井基础的水平承载力。与普通沉井基础相比,根式基础水平承载能力提高了近1倍;表层覆盖土层对根式基础水平承载能力影响较大,去除表层覆盖土层后,根式基础的水平临界荷载和水平极限荷载分别提高了150%和95%;根式基础自身结构的中上部是水平承载能力发挥的关键部位,当深度超过一定范围后,增加深度对提高水平承载力作用甚小。 In order to study the horizontal bearing capacity of root-caisson foundation, two-stage horizontal static load test of root-caisson foundation was carried out at the construction site of Maanshan Yangtze River Bridge, in which unidirectional- cychc slow sustaining loading method was applied. Results of horizontal critical load, horizontal ultimate load, relationship between horizontal load and displacement, deformation mechanism were obtained of common caisson foundation and root- caisson foundation. Test results show that the value of horizontal bearing capacity of root-caisson foundation is one times larger than that of common caisson foundation. The existence of the rootstalks could improve the horizontal bearing capacity of common caisson foundation. Covering soil has great effect on horizontal bearing capacity of root-caisson foundation. The horizontal critical load and ultimate load could increase by 150% and 95% respectively without covering soil. The upper part of the root-caisson foundation structure is the key position to bear the horizontal loadings, so the effect is small to improve the horizontal bearing capacity through adding buried depth when the depth exceeds a certain range.

关 键 词： 根式基础 水平静载试验 水平承载力 厚覆盖软土层

领　　域： [建筑科学] [建筑科学]