砂土地层深基坑桩锚支护体系的受力与变形

通过对沈阳华强金廊城市广场项目基坑进行长期监测,对该深基坑的桩顶水平位移、桩体水平位移及变形和锚索预应力值进行了分析,探究了桩锚支护体系受力特点和变形规律.研究结果表明:砂土地层基坑围护结构变形的时间效应不显著,围护桩桩顶水平位移空间效应特征明显,围护桩桩体水平位移呈两头小、中间大的鱼腹状变形,桩体受锚索预应力影响产生类似简支梁变形曲线,锚索受季节性冻胀影响显著,且从上到下影响逐渐减小;桩锚支护体系采用600 mm桩径的围护桩具有工程可行性,控制变形能力较强.

Stresses and Deformations in Pile-Anchor Support System of Deep Foundation Pit in Sandy Layers

Based on the long-term monitoring data of the foundation pit of Golden City Square project in Shenyang， the horizontal displacements and deformations on the pile top and in the pile body， as well as the prestress in the anchors were analyzed in order to understand the mechanical characteristics and deformation laws in the pile-anchor support system. Results showed that time effect of deformation in the support system of the foundation pit is not significant in sandy layer. However the spatial effect of the horizontal displacements on the pile top is significant. The horizontal displacements of the pile body take on a fish belly shape with small values at the two ends and large values in the middle. Due to the effect of the prestress in the anchor， the deformation curve of the pile body is similar to that of a simply supported beam. Anchors are significantly affected by seasonal frost heavy， whose influence is gradually reduced from top to bottom. The 600mm diameter supporting piles in the pile-anchor support system are capable of controlling the deformation， thus being feasible in this project and having a broad application prospect.