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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 foundation, a two-stage horizontal static load test was carried out at the construction site of Maanshan Yangtze River Bridge using a one-way single-cycle slow maintenance load method. The results obtained are as follows: horizontal critical load, horizontal ultimate load, horizontal load and horizontal displacement, deformation characteristics of ordinary caisson foundation and foundation. The test results show that the horizontal foundation bearing capacity is better than ordinary caisson foundation. Implantation of root can significantly improve the horizontal caisson capacity of ordinary caisson. Compared with common caisson foundation, the horizontal foundation carrying capacity increased by nearly 1 time. Surface covering soil layer had a greater influence on the horizontal foundation bearing capacity. After removing the surface covering soil, the horizontal critical load and horizontal ultimate load Respectively, increased by 150% and 95% respectively. The middle and upper part of the root foundation is the key part of the horizontal bearing capacity. When the depth exceeds a certain range, increasing the depth has little effect on the horizontal bearing capacity.