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软土地区压力分散型锚索的试验先例较少,存在锚索的极限承载力影响因素多、理论研究落后于工程实践、设计计算方法不成熟等难题。该文通过压力分散型锚索的现场破坏性拉拔试验,得到并对比分析了常压注浆和二次劈裂注浆两种不同施工工艺锚索的拉力-位移关系。结果表明,该试验二次劈裂注浆锚索平均极限承载力比常压注浆锚索提高了20%,其锚固效果能达到设计要求,对软土地区类似的工程具有一定的参考价值。
There are few test precedent for pressure-dispersive anchor cable in soft soil area, there are many factors affecting the ultimate bearing capacity of anchor cable, the theoretical research lags behind engineering practice, immature design and calculation methods. In this paper, by means of on-site destructive pullout test of pressure-dispersive anchor cable, the tension-displacement relationship of anchor cable under two different construction technologies, normal pressure grouting and secondary splitting grouting, is obtained and compared. The results show that the average ultimate bearing capacity of secondary split grouting cable is 20% higher than that of normal pressure grouting cable. The anchoring effect can meet the design requirements and has certain reference value for similar projects in soft soil area.