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以竖向高聚物注浆锚杆为对象,对高聚物锚固体与粉土间的黏结性能进行了大量试验,详细研究了锚固体直径、密度、长度对黏结强度的影响;同时研究了不同锚固体长度下黏结应力的分布情况,及其在不同荷载作用下的变化规律。试验结果表明:钻孔孔径、锚固体密度、锚固体长度对黏结强度均有重要影响:黏结强度随锚固体密度的增大而增大,在小密度情况下增幅更为明显;黏结强度随锚固体长度的减小而增大,短锚固长度(2.5~4 m)下土体的抗剪强度几乎能完全发挥,长锚固体(5 m)时仍具有较长的有效黏结长度;黏结强度基本随孔径的增加而减小。高聚物锚杆有较显著的黏结应力集中分布现象,主要黏结区域随着荷载增大逐渐向底部转移和扩大。
Taking the vertical grouting anchor as object, a large number of experiments were conducted on the bond properties between polymer anchor and silt. The effects of anchor diameter, density and length on the bond strength were studied in detail. The distribution of bond stress under different anchor lengths and its variation under different loadings. The experimental results show that the hole diameter, the density of anchor and the length of anchor have an important influence on the bond strength. The bond strength increases with the increase of anchor density, and increases more obviously with small density. The bond strength increases with the anchorage The shear strength of the soil under the short anchorage length (2.5 ~ 4 m) can almost be fully exerted, while the long anchorage body (5 m) still has a longer effective bond length. The bond strength Decreases with the increase of pore size. The polymer grouting rod has more obvious stress concentration distribution, and the main bond area gradually shifts to the bottom and expands with the increase of load.