肋梁-桩-锚支护结构锚索拉力计算理论模型及其应用

Theoretical model and application of anchor cable tension calculation for rib-beam-pile-anchor support structure

肋梁-桩-锚支护结构有别于传统桩锚支护结构,前者在传统排桩上增设了竖向肋梁。为解决肋梁桩锚支护结构中锚索拉力计算问题,以变形协调理论为基础,根据肋梁、桩和锚索这3种支护结构在共点时水平位移相等,构建肋梁-桩-锚索共同支护作用下锚索拉力计算理论模型,并将该模型应用于某深基坑工程的锚索拉力计算。研究结果表明:基于该理论模型求解得到的锚索拉力小于传统桩锚支护结构锚索拉力,与工程实际结果更加接近;由于有肋梁存在,支护结构整体刚度提高,支护结构的受力分布更加合理,锚索内力更小,节约了工程造价,同时提高了支护结构的整体稳定性。

The rib-beam-pile-anchor support structure is different from the traditional pile anchor support structure,with the former adding the vertical rib beam to the traditional row pile.In order to solve the rib-beam pile anchor support structure,according to the equal horizontal displacement at the combined point of the rib beam,pile and anchor,the tension calculation model was built for the rib-beam-pile-anchor support structure based on the deformation coordination theory.The model was applied to calculate the anchor cable tension in a deep foundation pit engineering.The results show that with the theoretical model,the anchor cable tension is less than that of the traditional anchor support structure,and it is also closer to the actual situation of the engineering.Because of the existence of rib beam,the overall stiffness of the structure is improved,the supporting structure stress distribution is more reasonable,the prestress is smaller,the construction cost is lower,and the overall stability of the supporting structure is improved.