咬合桩在邻近高填土基坑中的工程应用与实测分析

针对某采用咬合桩围护方案的邻近高填土基坑工程进行分析,当咬合桩作为围护桩时,可采用等效刚度法计算围护桩的桩身变形;作为隔离桩使用时,忽略素混凝土桩的作用,仅考虑钢筋混凝土桩的抗弯能力。现场实测表明,邻近高填土基坑工程在开挖时,咬合桩明显地降低了基坑开挖对紧邻高填土的扰动,满足了高填土自身的稳定,保证基坑工程在高填土作用下的安全。而咬合桩作为一种新型排桩围护结构,也能够起到很好的应力隔离作用,有效地分担了邻近超载的影响,确保了高填土的稳定和基坑工程安全。

Application of Secant Piles in Excavation Pit Adjacent to the High-filling Surcharge Loads and In-situ Measurements

To analyze an excavation engineering adjacent to high-filling surcharge loads, an equivalent stiffness method was applied to calculate the deformation of secant piles which were used as the retaining structure of foundation pit. And only the flexural capacity of reinforced concrete piles was taken into account when the secant piles were considered as the isolation piles. In the second case, the flexural capacity of plain concrete piles was ignored. The in-situ measurements revealed that both stability of the filling soil and safety of the foundation pit were satisfied in the excavation engineering adjacent to the high-filling surcharge load. Secant piles, as a new kind of retaining structure, are suitable for isolating the stress caused by the adjacent overloading, ensuring the stability of landfill soil and the safety of excavation engineering.