高强预压锚固技术抗拔力提升效应

提出了一种以大掺量膨胀锚固体作为锚固体的新型自膨胀高强预压锚固技术,阐明了其工作原理.研发了能消除CT伪影、获取极大膨胀应力(大于35 MPa)、精确定位扫描的高强预压锚固体系测试装置及方法,并结合分圈层定量CT图像解析技术,建立了以膨胀剂掺量及临空面距离为变量的CT值预测公式.对自膨胀锚固体及锚固体外土体进行了对比试...

Uplift Effect of High Strength Preloaded Anchorage

A new type of self expansion and high strength preloading anchorage technology was presented with large amount of expansion anchor solids as anchor solids. Test device and method for high strength pre compression anchorage system that can eliminate CT artifacts, obtain maximum expansion stress(>35MPa), and accurately locate and scan were developed. Combined with the analysis technology of the quantitative CT image of the ring layer, a prediction formula for CT value was established with the content of expansion agent and the distance of overlying surface as variables. To compare expansive soil anchor solid and anchoring in vitro, let CT value, diameter, ring to the expansion stress and strain be the main representation, CT value was get along with the changing regularity of linear expansion, expansion force size, ring to the spatial evolution rule, body strain increases with the increasing layers of change rule. Layers of soil anchor in vitro from internal to external layers of compactness linearly reduced. Mechanism of linear increase of large diameter anchor solid was elucidated. The results reveals the contribution of the increase of density and normal stress induced by auto expansion to the anti uplift effect of pulling force in the high strength preloaded anchorage system.