软土地区压力分散型锚索二次劈裂注浆锚固效果研究

Study on Anchorage Effect of Pressure-Dispersive Anchorage Cables with Secondary Splitting Grouting in Soft Soil Area

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 examples about the tests of pressure-dispersive anchorage cables in soft soil area,and there are several problems including many influential factors about the determination of ultimate bearing capacity,theoretical study lags behind engineering practice and the immaturity of design calculation method etc.Through the in-situ destructive uplift test of the pressure-dispersive anchorage cables,tension-displacement relationship of the anchorage cables with common pressure grouting and secondary splitting grouting is obtained and comparatively analyzed in this paper.The results show that the average ultimate bearing capacity of the anchorage cables with secondary splitting grouting increases about 20% than that of common pressure grouting,and its anchorage effect reaches the design requirement,it has important reference value for similar projects in soft soil area.