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在岩质深基坑及超深基坑中,预应力锚杆柔性支护法具有造价低,工期短,施工简便,安全性高等诸多优点,经济效益和社会效益十分显著。结合大连胜利广场深基坑工程,采用FLAC软件进行数值模拟分析,重点研究了不同锚杆预应力对基坑力学行为的影响。结果表明:锚杆的预应力较小时,预应力越大,基坑侧壁的水平变形和地表的竖向沉降越小;预应力较大时,预应力的继续增加已不能进一步降低水平变形和减小竖向沉降;锚杆的预应力能有效减小岩土体内的最大剪切应变增量,在一定程度上延缓基坑剪切滑移破坏的发生;锚杆预应力存在一个合理的界限值。本文关于应力锚杆柔性支护法的设计方案及数值模拟研究结果对该技术的推广和应用提供了很好的借鉴作用。
In rock deep foundation pit and ultra deep foundation pit, the prestressed anchor flexible supporting method has the advantages of low cost, short construction period, simple construction and high safety, and has obvious economic and social benefits. Combined with Deep Foundation Pit Project of Shengli Plaza in Dalian, numerical simulation analysis is carried out by using FLAC software, and the influence of different prestressed anchors on the mechanical behavior of foundation pit is mainly studied. The results show that when the prestressing force is small, the greater the prestressing force is, the smaller the horizontal deformation of the sidewall of the foundation pit and the vertical settlement of the ground surface are. When the prestressing force is large, the continuous increase of the prestressing force can not further reduce the horizontal deformation and Reduce the vertical settlement; Prestress of anchor can effectively reduce the maximum shear strain increment in rock and soil body, to a certain extent, delay the occurrence of shear-slip failure; There is a reasonable limit value. In this paper, the design scheme and numerical simulation results of the stress anchor flexible support method provide a good reference for the promotion and application of the technology.