预应力锚杆柔性支护法的研究及应用.pdf

第27卷 第11期 岩 土 工 程 学 报 V 2005年 月11 预应力锚杆柔性支护法的研究与应用 贾金青，郑卫锋 （大连理工大学海岸与近海工程国家重点实验室，辽宁 大连 116024） 摘 要：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。 关键词：预应力锚杆；柔性支护；深基坑；数值分析 中图分类号：TU 443 文献标识码：A 文章编号：1000 –4548(2005)11 –1257 –05 作者简介：贾金青(1962 – ) ，男，河北沧州人，博士，教授，博士生导师，主要从事地下工程、地基处理等领域的研 究与工程应用。 Study and application of flexible retaining method with prestressed anchor JIA Jin-qing, ZHENG Wei-feng (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China) Abstract: 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 carried 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. Key words : prestressed anchor; flexible retaining; deep excavation; numerical analysis 0 前 言 置于潜在滑移面以外的稳定土体中。面层是预应力锚 预应力锚杆柔性支护是应用于基坑开挖和边坡稳 杆柔性支护体系中必不可少的组成部分，常常采用挂 定的一种新型支挡技术，是由众多小吨位的预应力锚 钢筋网喷射混凝土，或将木板与喷射混凝土结合共同 杆与喷射混凝土面层或木板面层结合而成的一种支护 作用。面层的主要作用在于承受土体压力及水压力， [1]