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复合土钉支护技术在我国基坑工程中得到了广泛应用,结构的水平位移对工程有着至关重要的作用。目前对水平位移还没有完善和统一的设计与计算标准,施工控制也没有明确的规定。结合某复合土钉支护基坑工程,通过合理布点测得开挖中桩体水平位移。通过位移变化曲线分析,发现水平位移变形具有渐进性;对上部几层开挖比较敏感,特别是前两层开挖对桩身的水平位移影响较大;靠近上部布置的锚索更有利于减小基坑边坡的变形;支护结构水平位移与墙体长度有着明显的关系等规律。通过实际比较后认为规范对水平位移规定值可以适当放宽。土钉或预应力锚索的使用也影响着水平位移。
Composite soil nailing technology in China’s foundation pit project has been widely used, the horizontal displacement of the project has a crucial role. At present, there is no perfect standard for design and calculation of horizontal displacement and construction control. Combined with a composite soil nailing foundation pit project, the horizontal displacement of the pile in excavation is measured through reasonable distribution. Through the analysis of displacement curves, it is found that the horizontal displacement has a gradual deformation. It is sensitive to the excavation of the upper layers, especially the excavation of the first two layers has a great influence on the horizontal displacement of the pile. The deformation of the slope of small foundation pit; the horizontal displacement of support structure has obvious relationship with the length of the wall. After the actual comparison, it is considered that the standard can appropriately relax the prescribed value of horizontal displacement. The use of soil nails or prestressed anchors also affects horizontal displacement.