膨胀土基坑中玄武岩筋材锚固特性现场试验

Field test on anchorage characteristics of basalt reinforcement in expansive soil foundation pit

玄武岩纤维复合筋因其强度高、耐久性好等特点,被广泛应用于锚固工程。为此,本文以膨胀性黏土场地为例,通过开挖3面边坡分别进行玄武岩筋材锚杆支护、钢筋锚杆支护和无支护,探讨不同支护结构在膨胀土边坡场地中的支护效果。研究结果表明:钢筋锚杆和玄武岩筋材锚杆受力较小,边坡加固后变形小,边坡整体稳定。当开挖坡脚并浸水后,锚杆受力突增,当继续进行坡顶浸水之后,锚杆受力明显增加且变化速率大。本文研究成果可在锚杆(索)、支护桩等边坡工程中采用玄武岩纤维复合筋替代现有钢筋提供设计依据。

Basalt fiber composite reinforcement is widely used in anchoring engineering due to its high strength and good durability.Therefore,the expansive clay site is taken as an example,while anchor bolt support of basalt reinforcement,steel anchor bolt support of basalt reinforcement and unsupported basalt reinforcement are carried out respectively by excavating three slopes,and the support effects of different supporting structures in expansive soil slope site are discussed.The results show that the reinforcement anchor bolt and basalt reinforcement anchor bolt are under less stress,the deformation of the slope after reinforcement is small,and the overall stability of the slope is stable.When the foot of the slope is excavated and immersed in water,the force of the anchor bolt increases suddenly,and when the top of the slope is continued to be immersed in water,the force of the anchor bolt increases significantly and the rate of change is large.The research results can provide a design basis for the use of basalt fiber composite reinforcement to replace the existing reinforcement in slope engineering such as anchor bolt(cables)and supporting piles.