边坡锚杆拉拔模型试验研究

Model Test Research on Anchor Pulling of Slope

针对滇黔玄武岩地区的土质边坡情况,设计了边坡锚杆拉拔室内模型试验。试验获得了在固定拉拔力下,不同锚固长度的锚杆的荷载-位移曲线。并在注水情况下,得到了锚杆预应力随时间的变化曲线和锚杆位移随时间的变化曲线。试验研究结果表明,锚固长度与承载力间不是简单的线性关系,而存在一个临界锚固长度,在锚固长度大于临界锚固长度的情况下,增加锚固长度并不能提高抗拔极限承载力;水对锚杆承载力的影响非常大。

According to Yunnan, Guizhouprovince basalt areas of the slope soil, design an indoor model test of the slope anchor pulling. Test obtained in fixed drawing force, and different anchor length of the bolt load-displacement curve. In the water injection case, gor the bolt pretensioned stress changing with time curves and anchor displacement curve changes over time. The re suits of the test show that, anchor length and bearing capacity is not simple linear relationship, and there is a critical anchor length, In anchorage length is more than the critical anchor length, increase the anchor length can＇t improve pulled out of ultimate bearing capacity; The influence of the water to the bearing capacity of anchor bolt is very big.