考虑土体压力随变形及支撑预加力修正的支护结构分析计算

Analysis of Retaining Structures Considering the Variation of Active Earth Pressure with Deformation and Bracing Axial Prestress

在深基坑施工过程中,围护结构随开挖逐渐发生变形,同时由于支撑预加力的运用,使围护结构发生进一步变形,内力也重新调整。针对现有设计方法仅考虑围护结构及土体的初始状态,不能考虑围护结构随变形而内力重分配均缺陷,提出了考虑实际基坑变形引起的围护结构随变形内力变化的计算理论,并通过实际工程的运用,验证了考虑围护结构的修正计算方法,结果表明,考虑围护结构随变形修正的计算方法更接近实测结果,具有较高的基坑围护设计应用与参考价值。

According to the actual excavation engineering, the retaining structure will distort as the excavation goes on, and the prepressing of the bracing enlarged the deformation, both of them will lead to the stress redistribution of the retaining structure. But only the original state of soil is considered in current designing methods. In this paper, a new theory of stress analysis for the retaining structure was put forward. Both the actual soil deformation and the prepressing were considered. A practical project was mentioned to test the applicability of the new theory at the end of the paper. The calculation result was more close to the practical condition, and the theory recommended in this paper gives more accurate result which is a valuable reference to the foundation support design.