深基坑双排桩支护结构上的变形和土压力研究

Deformation and earth pressure of a double-row piles retaining structure for deep excavation

根据某大型深基坑工程的实测资料,对双排桩支护结构上的截面弯矩、变形和土压力分布特征进行了研究,并对基坑开挖的空间效应、冠梁刚度对土压力的影响、支护结构变形与土压力分布的关系、双排桩支护结构与土的相互作用机制等进行分析。研究表明,深基坑双排桩支护结构上的土压力分布是十分复杂的,用传统的土压力计算方法估算双排桩支护结构上的土压力存在较大偏差。其研究结果为双排桩支护结构上土压力设计计算模式的建立提供了依据。

Based on a large number of measured data for a deep excavation in-situ, the corresponding bending moments, deformation characteristics and the earth pressure distribution of a double-row piles retaining structure are studied. Some problems are analyzed, including the space effect of deep excavation, the effect of cap beam on earth pressure, the relationship between retaining structure deformation and the earth pressure distribution, and the mechanism of action between retaining structure and soil. The studies show that the earth pressure distributions on the double-row piles retaining structure are quite complicated, and are different from those obtained by the classical Rankine＇s or Coulomb＇s earth pressure theory, which supply a basis for the design model of double-row piles retaining structure.