带衬套灌浆锚杆与砖砌体锚固性能计算方法研究

文章采用ABAQUS软件,结合双线性剪切滑移模型得到了带衬套灌浆锚杆在滑移过程中的内部应力分布及变化过程,根据多因素对锚杆锚固性能的影响程度提出锚杆最大拔出力计算公式。将数值模拟结果和理论计算结果与试验值比对,证明方法合理。基于文章的研究结果给出采用该类锚杆对历史性建筑进行加固时锚杆锚固深度以及钻孔直径取值范围。

带衬套灌浆锚杆在砖砌体中拉拔性能试验研究

带衬套灌浆锚杆是一种可用于加固修复且不改变大体积砖砌体文物建筑外貌的新型技术。为了研究带衬套灌浆锚杆在砖砌体中的拉拔性能,以灰缝饱满度、锚固深度、钻孔直径以及锚固方向为研究参数,设计并完成了21根锚杆的拉拔试验,分析了锚杆的破坏形态、拔出力-滑移曲线、锚筋应变和界面黏结应力分布以及峰值拔出力。试验结果表明:带衬套灌浆锚杆与砖砌体的拔出力-滑移曲线呈现明显的四段线特征;锚杆中锚筋不易屈服;灰缝饱满度和钻孔直径对锚杆的破坏形态有直接影响;锚杆的峰值拔出力与锚固深度存在非线性增长关系;灰缝饱满度高、钻孔直径大,锚杆的峰值拔出力高;竖向锚杆的峰值拔出力明显高于水平向锚杆。

Technology of reinforcement maintenance and blocking against water for large section chamber

The scheme and construction measurement of reinforcement and blocking against water for winder chamber after destroyed by mining influence have been introduced in this paper. The basic principle and advantages of bolting and grouting lining have been also listed. Bolting and grouting lining can increase the integrity and load-carrying capacity of supporting framework and it can assure the stability of supporting framework. It possesses not only the flexible and yielding capacity of bolting and shotcrete lining, but also the effect of rigid support such as metal support and brickwork, forming many kinds of support system, maintaining the stability of roadway together.