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通过室内模型试验,模拟了土层锚杆在地面荷载作用下的工作条件,分析了其工作性能,得出了锚杆轴向应变的分布特征、同一锚杆轴向应变随地面荷载增加以及作用时间的变化特点、不同层锚杆轴向应变随地面荷载增加以及作用时间的变化特点。试验表明:土层锚杆轴向应变由孔口向锚固端逐渐递减;随着荷载的增加,应变峰值先增大,后减小;在同级荷载作用下,轴向应变水平也呈现出先增大后减小的趋势;在地面荷载较小的情况下,顶层锚杆起主导作用,当达到极限后,起抗滑作用的主要是中间和底层锚杆。
Through the indoor model test, the working conditions of soil anchor under ground load were simulated, the working performance was analyzed, the distribution characteristics of anchor axial strain were obtained, the axial strain of the same anchor with the increase of ground load and the role Time characteristics of different layers of rock bolt axial strain increases with the load on the ground and the role of time changes. The experimental results show that the axial strain of soil anchor decreases gradually from the orifice to the anchorage end. With the increase of load, the peak value of strain increases first and then decreases. Under the same load, the axial strain also increases first After the big downward trend; in the case of small ground load, the top of the anchor plays a leading role, when the limit is reached, the main anti-sliding effect is the middle and bottom of the anchor.