钢筋在堆石料中的拉拔试验研究

发布时间：2018-07-01 19:54

本文选题：加筋 + 堆石料　；参考：《水利水运工程学报》2017年05期

【摘要】：作为一种有效的土石坝抗震加固措施,加筋在高土石坝建设中正被越来越广泛地运用。钢筋与堆石料接触特性及影响因素研究是合理进行加筋设计的前提。通过室内拉拔试验研究了钢筋与堆石料的界面摩擦特性,揭示了不同上覆压力、堆石料含水状态、堆石料级配及孔隙率等因素对试验结果的影响。结果表明,堆石料与钢筋接触面剪应力与拉拔位移曲线呈下端开口的抛物线形状,上升段陡于下降段,残余剪应力数值不稳定;4个影响因素中,上覆压力与峰值剪应力曲线近似于线性正比关系;孔隙率和峰值剪应力曲线类似于线性反比关系;级配平均线的峰值剪应力与拉拔位移曲线位于级配上包线的试验曲线之上;饱和含水状态下堆石料的峰值剪应力与拉拔位移曲线远低于风干状态。
[Abstract]:As an effective seismic reinforcement measure of earth-rock dam, reinforcement is more and more widely used in the construction of high earth-rock dam. The study of contact characteristics and influencing factors between reinforcement and rockfill is the premise of reasonable reinforcement design. The interfacial friction characteristics of steel bar and rockfill were studied by drawing test in laboratory. The effects of different overburden pressure, water state of rockfill, gradation of rockfill and porosity on the test results were revealed. The results show that the curve of shear stress and drawing displacement of the interface between rockfill and steel bar is parabola of lower end, the ascending section is steeper than the descending section, the value of residual shear stress is unstable, among the four influencing factors, The curve of overburden pressure and peak shear stress is approximately linear proportional, the curve of porosity and peak shear stress is similar to the linear inverse relationship, the curve of peak shear stress and drawing displacement of gradation average is above the test curve of gradation envelope. The peak shear stress and drawing displacement curve of rockfill in saturated water state are much lower than those in air dry state.
【作者单位】：南京水利科学研究院;常州工学院;
【基金】：水利部公益性行业科研专项经费项目(201501035)
【分类号】：TV41

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