基于局部变形理论的非均质地层中预应力锚固受力分析

Analytical approach for prestressed anchor embedded in non-homogeneous stratum based on Winkler's assumption

将非均质地层中的预应力锚索沿锚固段离散为一系列子锚固段,导出基于局部变形理论的各子锚固段理论解,并由子锚固段之间的相互作用关系分别建立非均质地层中拉力集中型和压力集中型预应力锚索锚固分析方法,编写了相应的分析程序。对位于非均质地层中的拉力型和压力型预应力锚索在多级测试荷载作用下的响应进行分析。结果表明,所提出的分析方法和程序是可行的,特别地,对于拉力集中型预应力锚索,考虑第一界面作用效应的分析结果更符合实际。

The anchorage, which is embedded into the non-homogeneous stratum in most cases, is divided into a series of sub-anchorage segments. The closed form solution for every segment is deduced based on Winkler＇s assumption which is widely accepted in the analysis of interaction between the inclusive and ground. At the same time, the solution for the whole anchorage is also gained according to the continuum and compatible condition between the conjoint segments; and a general analysis program is developed for the tension anchor and compression anchor. It is indicated that the proposed solution is practicable by analyzing a compression anchor and a tension anchor, which are placed into non-homogeneous stratum and tested elaborately in site by Kim in 2003 under the multiple load-cases. Especially, the results are more reasonable for the tension anchor when the action between the tendon and grout is taken into account properly.