预应力锚杆柔性支护法的研究与应用

Study and application of flexible retaining method with prestressed anchor

预应力锚杆柔性支护是一种新型的深基坑支护技术。本文对其基本构成与主要特点进行了阐述,对基坑的破坏模式进行了研究和概括,基于极限平衡理论进行了公式的推导。通过数值分析,对其变形与滑移场进行了研究,并与相同条件下的土钉支护进行了比较。通过实际工程的应用,进一步验证了该方法的优越性:基坑变形小,特别适用于超深基坑的支护。

A new retaining method for deep excavation flexible retaining method with prestressed anchor has been developed by the authors. The basic composition and the main characteristic of this new method were studied of, and the failure patterns of excavations were described. Based on the limit equilibrium theory, the formular of stability analysis was carded out. Subsequently, deformation and critical sliding zone were analyzed with finite difference method. The calculated results were compared with the soil-nailed support system. Finally, applicability of this new method to practical design works was demonstrated. Its advantages such as small displacements and application to super-deep excavations were investigated.