黄土地层中锚杆受力性能试验分析

Experimental analysis of anchor's stress performance in collapsible loess layer

介绍了以黄土地层作为支护对象的锚杆室内模型试验 .试验表明 :锚杆受力规律与在其它支护介质中相似 .按理论推导得到了最佳安装角αopt的计算公式 ,将其简化为αopt=6 0°- φ(其中 φ为土的内摩擦角 ) ,并提出了剪力沿锚杆长度分布的“黄金分割”规律 ,得出了各种锚固 (不同锚固角 )情况下的有效锚固长度 .

A model test of anchor in laboratory is presented, where the loess is taken as the supported object. The test results show that the stress distribution pattern of the anchor is similar to that when other supporting media are used. An approach calculation formula for optimum embedding angle α opt is deduced with the classic theory, and the formula is simplified as α opt =60- φ(φ being the internal friction angle of loess media). Meanwhile, a golden section pattern for variation of shearing force along the anchor is proposed here and effective anchoring length is obtained for several different embedding angles.