端锚粘结式锚杆受力特性试验研究

发布时间：2018-02-03 08:30

本文关键词： 端锚粘结式锚杆加载模式极限锚固力室内试验　出处：《长江科学院院报》2014年06期 　论文类型：期刊论文

【摘要】：为研究端锚粘结式锚杆锚固段力学特性,以水泥水玻璃砂浆端锚锚杆体为研究对象,采取小应变高频动荷载等效成大应变低频荷载的加载模式,进行反复拉拔试验,得出在不同的外载荷作用下,端锚锚杆在锚固段各位置处拉应力与剪切应力变化趋势。结果表明:采用小应变高频变动荷载加载模式的正确性和可靠性,可满足端锚模型试验要求;在加载频率为430.882 Hz情况下,端锚自由变形段应力应变的数值最大,在锚固段远端产生波谷值,最小值可以接近0,沿锚杆体轴向产生的应力分布近似为正弦函数的λ/2波长之间的波形图;通过试验结果处理分析可求解出沿锚杆体的剪切应力分布、位移情况曲线和τ-u曲线,在端锚锚固变形段的剪应力取得较大值,同时伴随着循环加卸载增量百分比和次数的增加,剪切应力峰值发生传递性,逐渐缓慢向锚固段底端的方向移动,最终导致锚固段的锚固特性失去工作效能。
[Abstract]:In order to study the mechanical characteristics of the anchoring segment of the end anchor, the low frequency dynamic load of small strain is equivalent to the low frequency load of large strain. Repeated drawing tests were carried out, and it was concluded that under different external loads. The variation trend of tensile stress and shear stress of end anchor bolt at various positions of anchoring section. The results show that the correctness and reliability of loading mode with small strain and high frequency variable load can meet the requirements of end anchor model test. Under the loading frequency of 430.882 Hz, the stress and strain value of the end anchor free deformation section is the largest, and the minimum value can be close to 0 at the far end of the anchoring section. The stress distribution along the axial direction of the anchor body is approximately the waveform between 位 / 2 wavelength of the sinusoidal function; The shear stress distribution, displacement curve and 蟿 -u curve along the anchor body can be solved by processing and analyzing the test results, and the shear stress of the end anchor deformation section can be obtained. At the same time, with the increase of the increment percentage and times of cyclic loading and unloading, the peak shear stress is transitive and gradually moving to the bottom of the anchoring section, which ultimately results in the loss of the anchoring performance of the anchoring section.
【作者单位】：辽宁工程技术大学土木与交通学院;
【基金】：国家自然科学基金(51008148) 中国煤炭工业协会资助项目(MTKJ2012319) 辽宁省大学生创新创业训练计划项目(201310147015) 辽宁工程技术大学国家自然基金前期资助项目(11-163)
【分类号】：TD353.6
【正文快照】： 到目前为止,研究在全锚条件下锚杆体的受力机制成果有很多[1-5],但仅有较少系统的文献研究过端锚粘结式锚杆体锚固段的受力特性,且大多数研究不能正确反映锚杆体的实际受力特性。伴随着外载荷数值水平的持续增大,杆体和周围灌浆介质交界面上的微观粘结剪切应力也随着增大,而且

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