北京地铁新宫站复合支护结构参数优化分析

Optimized Design on Parameters of Composite Supporting Structure in Xingong Station in Beijing Subway

以北京地铁19号线新宫站基坑工程复合支护结构为例,运用MIDAS/GTS软件实现对基坑施工过程的模拟,分析支护参数对支护结构受力和变形的影响。结果表明:①随桩径增大,桩体水平位移逐渐减小,各层锚索轴力最大值逐渐减小。②随桩间距增大,桩体水平位移逐渐增大,各层锚索轴力最大值逐渐增大。③随锚索倾角增大,桩体水平位移逐渐增大,各层锚索轴力变化呈现出先增大后减小趋势;在倾角为15°时,锚索受力最大。④锚索锚固段长度越大,桩体水平位移越小,各层锚索轴力最大值均增大。

The foundation pit engineering of Xingong station of Beijing subway line 19 was taken as an example, and MIDAS/GTS software was adopted to simulate the foundation pit construction process and the influence of supporting parameters on the stress and deformation of the supporting structure was analyzed. The results show that:① as the pile diameter increases, the horizontal displacement of the pile decreases gradually and the maximum axial force of each layer of anchor cable decreases gradually.(2) As the pile spacing increases , the horizontal displacement of the pile increases gradually and the maximum axial force of each layer of anchor cable increases gradually.(3) As the inclination angle of anchor cable increases, the horizontal displacement of pile increases gradually. The axial force change of each layer of anchor cable presents a decreasing trend after first increases, when the dip angle is 15°, the anchor cable force is the largest;④ the larger the length of the anchorage section of anchor cable, the smaller the horizontal displacement of pile body, and the the maximum axial force of each layer of anchor cable increases.