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结合具体的工程实例,介绍了预应力框锚技术在墙内填料为类松散体的高挡墙加固中的设计特点和施工难点,揭示了类松散体填料高挡墙加固中预应力框锚结构设计参数选取困难的特点,并针对墙内地质条件复杂的情况提出了多机型协调组合的施工方法,有效地解决了施工中的难点。还开展了锚杆拉拔试验,对比了预应力锚杆在不同地层条件下荷载与位移关系,并将试验值与设计值进行了对比分析,结果表明选取的参数计算得到预应力锚杆拉力设计值与试验值吻合较好。最后对加固前后挡土墙的稳定性进行了对比分析,发现预应力框锚结构能明显提高挡土墙的抗滑移稳定性和抗倾覆稳定性。
Combined with the concrete engineering examples, the design features and construction difficulties of the high retaining walls with prefabricated frame anchors in the wall are introduced, and the prestressed frame anchors with loose retaining walls The design parameters are difficult to select, and the multi-model coordinated construction method is put forward according to the complicated geological conditions in the wall, which effectively solves the difficulties in the construction. Also carried out the anchor pull test, compared the relationship between load and displacement of prestressed anchor under different formation conditions, and compared the experimental value with the designed value. The results show that the prestressed anchor tension design The values agree well with the experimental values. Finally, the stability of the retaining wall before and after reinforcement is compared and analyzed. It is found that the prestressed frame and anchor structure can obviously improve the anti-slip stability and anti-overturning stability of the retaining wall.