岩石地基上扩展基础力学性能研究

Study on mechanical properties and engineering application of spread foundation on rock foundation

岩石地基上的扩展基础承载力高,但目前岩石地基上扩展基础的专门研究工作开展较少。本文通过对岩石地基上扩展基础现场试验,得到了基础各受力阶段基底反力分布规律和钢筋受力值,发现基底反力分布为中间小边缘大且随着荷载提高,边缘应力集中明显,全过程钢筋受力变化不大,且跨高比较小的基底反力分布平缓。同时,通过建立数值分析模型对基底反力规律进行了验算校核,结果较好。

The bearing capacity of the rock foundation is high,but the current research on the spread foundation of the rock is not carried out.Based on the field test of the spread foundation of the rock foundation,the distribution of the base reaction force and the reinforcement stress are found.The results show that the distribution of the base reaction force is low in the middle but high in the edge.With the increase of the load,the edge stress concentration is obvious.The reinforcement stress of the whole process is almost not changed.And the distribution of the base reaction force of the base with lower span-height ratio is relatively smooth.At the same time,the numerical analysis model is used to check the distribution of the base reaction force,and the result is reasonable.