Research purposes:Currently,the problem of the big size of external anchor structure often exists in the existing high strength anchors.On the basis of the study on the load dispersion-type anchors,a new structure of slope anchorage-recursive control anchor is presented and the 3-D explicit finite difference method is used for the numerical simulation and study on the load transfer mechanism of the recursive control anchor.Research conclusions:(1) The shear stress in the bonding section is distributed in the light of exponential curve form of the single peak in stead of unevenly distributed form when the anchor is loaded.The recursive control anchor can disperse the concentrated load into several smaller loads on the different bonding sections among the sliding masses to make full use of the formation strength of the free segment.(2) The results of numerical simulation are basically consistent with the results of the qualitative analysis and model test.It shows that the numerical simulation of the anchor action process is feasible.(3) The recursive control anchor can overcome the traditional anchor＇s shortcoming that the counter-force load is entirely borne by external anchor structure and can reduce the size of external anchor structure effectively.(4) The research results can be applied in the slope reinforcement and quick treatment of the disease.%研究目的:既有高承载力锚杆普遍存在外锚结构物设计尺寸较大的问题,项目在研究荷载分散型锚杆基础上提出了一种边坡锚固新结构——递控式锚杆.采用三维显式有限差分法对其传力机制进行数值模拟研究.研究结论:(1)锚杆受力时黏结段切应力不是均匀分布的,而是按单峰值指数曲线形式分布;递控式锚杆能将集中荷载分散成若干个较小的力作用于不同的滑体黏结段上,充分调用自由段自身的地层强度;(2)数值分析结果和定性分析、模型试验的结果基本吻合,表明数值模拟锚杆作用过程是可行的;(3)递控式锚杆克服了传统锚杆反力荷载全部由外锚结构物承担的缺陷,可有效减小反力结构尺寸;(4)该研究成果可应用于边坡加固和病害快速治理.
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