软土区大倾角锚索的抗拔力试验研究

Test Research on Resistance of Anchorage Cable with Large Inclination Angle in Soft Soil Regions

软土地层不能提供有效的锚固力,这对于锚固法在软土区基坑支护工程中的应用提出了更高要求,为提供软土区基坑支护体系所需锚固力,锚索的有效锚固段需深入软土下层,设计中常采用长自由段、大倾角锚索。在常规施工工艺下,工程设计中大倾角锚索锚固力的取值为工程界所关注,本文对深圳某软土区预应力锚索进行了抗拔力试验,其结果可供类似工程参考。

Soft soil layers can not provide sustainable anchorage force,which gives a higher requirement in applying anchorage method to projects of retaining and protecting for foundation excavation in soft soil area. In order to provide sufficient anchorage force to retaining system of foundation pit in soft soil,the effective anchor part must be put underneath soft soil layers,so anchorage cables with long free part and large inclination angle arc always adopted in design. How to decide the anchorage force for large-inclination-angle anchorage cable, made on general construction condition,has been paid great attention to in project construction. In this paper,some pull-off tests on prestressed anchorage cable have been carry through in a soft soil area in Shenzhen,and the test result can been referenced on similar, project.