中心岛结构与支护桩联合支护设计研究

Research on the Construction of Deep Foundation Pit Support Combined with Underground Structure and Slope Protection Piles

为了降低基坑支护施工难度,对采用内支撑与中心岛结构联合支护的方案进行了模拟分析。通过计算得到不同工况下基坑支护结构的反力,并将其作用在中心岛结构上,分析中心岛结构的位移、应力随基坑开挖过程的变化规律,判定能否将支撑体系传递到中心岛结构上。研究结果表明:利用中心岛结构自身抗侧刚度,为基坑内支撑提供反力,可以满足基坑的变形要求,中心岛结构的侧移和附加应力在容许范围之内,联合支护方案可以简化施工工艺,减少临时水平对撑数量。

In order to reduce the difficulty of foundation pit support construction, a simulation analysis was carried out on the plan of combined support of internal support and central island structure. The reaction force of the foundation pit supporting structure under different working conditions is obtained by calculation, and it is applied to the central island structure. The displacement and stress of the central island structure change with the excavation process of the foundation pit to determine whether the supporting system can be changed.Pass to the center island structure. The research results show that: using the central island structure’s own lateral stiffness to provide reaction force for the support in the foundation pit, it can meet the deformation requirements of the foundation pit. The lateral displacement and additional stress of the central island structure are within the allowable range, and the joint support scheme can be simplified The construction technology reduces the number of temporary horizontal support.