黏土层中预应力锚索锚固段剪应力分布的试验研究

发布时间：2018-04-23 09:46

本文选题：预应力锚索 + 黏土层　；参考：《地下空间与工程学报》2015年S2期

【摘要】：通过两种差异较大的粘土层中预应力锚索现场试验,探讨了黏性土中预应力锚索锚固段剪应力的具体分布形式及其主要影响因素。试验结果表明,(1)锚固段剪应力并非均匀分布,而是呈单峰曲线形式;(2)土质越好,张拉荷载越大,锚固段剪应力峰值现象越明显。在相同土质条件,同样的张拉荷载作用下,锚索锚固段越短,剪应力分布峰值现象越明显;(3)极限状态下,锚固段剪应力峰值位置至锚固段起始点的距离和锚固段长度的比值在0.5左右,这也是土层预应力锚索锚固段主要受荷区域;(4)界面极限平均粘结强度受土质条件和锚固段长度的共同影响,设计中对于极限平均粘结强度的取值应灵活调整。研究为类似土质条件下的预应力锚索设计提供了一定的参考。
[Abstract]:Based on the field tests of two kinds of prestressed anchor cables in clay layer, the concrete distribution of shear stress in the anchoring section of prestressed anchor cable in clay soil and its main influencing factors are discussed. The experimental results show that the shear stress of Anchorage section is not uniformly distributed, but is in the form of a single peak curve. The better the soil quality is, the greater the tensile load is, and the more obvious the peak shear stress phenomenon of the Anchorage section is. Under the same soil condition and the same tensile load, the shorter the anchoring section of the anchor cable is, the more obvious the phenomenon of peak shear stress distribution is in the limit state. The ratio of the distance from the peak position of shear stress to the starting point of the Anchorage segment and the length of the Anchorage segment is about 0.5, This is also due to the influence of the soil condition and the length of the anchoring section on the average bond strength of the interface in the main loading area of the prestressed anchor cable Anchorage section. The value of the ultimate average bond strength should be adjusted flexibly in the design. The research provides a certain reference for the design of prestressed Anchorage cable under similar soil condition.
【作者单位】：中国建筑科学研究院地基基础研究所;机械工业勘察设计研究院有限公司;
【分类号】：TU476

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