桩锚支护结构设计及参数的研究

The Research of Designing Parameters on Anchor Piles Bracing Structure

采用弹性地基梁杆系有限元方法分析计算桩锚支护结构位移和内力时,在分析、建立开挖过程中不同工况下的力学模型的基础上,将开挖面以上支护桩取为梁单元,开挖面以下取为弹性地基梁单元,将锚杆模拟为弹簧.由于采用m法进行弹性地基梁计算时,比例系数m的取值对桩身位移计算结果的影响不可忽视,直接影响基础工程设计和造价,鉴于目前设计中多采用经验取值,使得计算结果差异较大。笔者通过桩的水平载荷试验分析,探讨了确定m值的方法,对青岛市沿海区域场地提出了参考m值.

Based on the analysis of time space effect, and by comparing several finite element methods used in foundation excavation computation, the authors choose the most practical rod finite element method. Because of the influence of the space and environment, the deformation is becoming a capital controlling factor. The problem of deformation controlling is explained. As the m value has a remarkable influence on the computation result, the present method of determing the result by experience causes too large a variation range in the computation result. The value of coefficient rn is obtained based on the horizontal load test.