【摘要】 为合理计算分层支护结构的内力及位移,以预应力锚杆复合土钉墙为研究对象,考虑分步开挖的施工过程及预应力施加对支护结构内力及变形的影响,将规范中的杆系有限元法进行改进,使其适用于柔性结构,提出一个考虑结构与土体相互作用的土压力计算模型,并编写了计算程序。将计算结果与工程实测数据进行了对比,证明采用该方法计算柔性支护的水平位移及构件轴力较为合理。更多还原

【Abstract】 The paper takes composite soil-nail braced structure with prestressed anchor as the study object and analyzes any possible change in its internal force and deformation,induced by the step-by-step excavation procedure and the prestressed force. Afterwards,the paper improves the tie-system FEMfor its application to flexible structure,as it proposes an earth-pressure calculation model considering both the structure and the interaction of the soil mass.The paper compares the calculation results arrived with the data collected on site and proves that the model can be useful in the calculation of the horizontal displacement of flexible structure and the member’s axial force.更多还原