陡坡路基椅式桩板结构关键设计参数影响性分析

Impact Analysis of Key Design Parameters of Chair-shaped Pile-board Structure in Steep Slope Subgrade

针对兰渝铁路陡坡路基地段,传统支挡结构已难以满足工程要求,则可采用椅式桩板结构。基于椅式桩板结构设计的基本理论,运用ABAQUS有限元软件建立三维模型,对椅式桩板结构进行了分析,研究关键参数对结构的影响。多组的比较分析表明:主桩、副桩与桩间土协同作用效果明显,坡率的变化不影响结构的受力,结构具有较大的刚度,可有效地限制陡坡路基的侧向变形;排距及纵向桩间距对椅式桩板结构受力影响较大,合理选择排距及纵向桩间距可获得较好的抗滑支挡效果。

For the steep slope subgrade of Lanzhou-Chongqing Railway,the traditional retaining structure is hard to meet construction requirements,so the chair-shaped pile-board structure can be adopted. Based on the design theory of chair-shaped pile-board structure,three-dimensional model was established using ABAQUS finite element software to analyze the chair-shaped pile-board structure,and study the effect of key parameters on the performance of the structure. Comparison analysis of several groups shows that the combination between main piles and vice piles and soil between piles can attain better effect; the change of slope ratio will not influence the structural mechanical proprieties. Structure has great stiffness,so lateral deformation can be effectively limited in steep slope subgrade. Piles row distance and vertical pile spacing have great influence on structural mechanical proprieties. Reasonable selection of row spacing and the vertical pile spacing can obtain good effect of anti-sliding retaining wall.