串囊式充气锚杆在砂土中的模型试验研究

串囊式充气锚杆是基于单囊充气锚杆的改进与创新,为研究其极限抗拔承载力和位移的影响因素,通过对串囊式充气锚杆进行一系列室内模型试验,获得了其相应的抗拔承载力—位移曲线.试验结果表明影响串囊式充气锚杆极限抗拔承载力和位移的主要影响因素有:充气压力、埋置深度、橡胶膜长度和厚度、气囊个数、气囊之间的间距等,这些因素对串囊式充气锚杆的影响程度各不相同.通过与单囊充气锚杆的对比试验,得出在相同条件下,串囊式充气锚杆的极限抗拔承载力较单囊充气锚杆增加了1.2~1.7倍,极限位移仅为单囊充气锚杆的37%~66%.串囊式充气锚杆在增大承载力的同时,有效的控制了位移.

Model Test Study on Bladder-type Inflatable Anchor

Bladder-type inflatable anchor is the improved and innovated inflatable anchor. In order to analyze the influencing factors of the ultimate up-lift bearing capacity and ultimate displacement, a series of laboratory model tests were carried out on bladder-type inflatable anchor. From experiments, we obtained uplift capacity-displacement curves. Test results have shown that the influencing factors include inflation pressure, embedded depth, length and thickness of rubber membrane, number of airbags, the distance between airbags and so on. However, the influence degree is different on bladder-type inflatable anchor. Through the contrast test with single capsule inflatable anchor, it is concluded that, under the same conditions, the ultimate up-lift bearing capacity of bladder-type inflatable anchor increases 1.2~1.7 times, and the ultimate displacement is 0.37~0.66 times of the single capsule inflatable anchor, which controls the displacement effectively.