基于SH-(C+F)浆液锚杆锚固性能与机理研究

PERFORMANCE AND MECHANISM OF BOLTS FULLY GROUTED WITH SH-(C+F) SLURRY

锚固技术在土遗址稳定性控制领域已得到了广泛应用,然而锚固浆液的缺乏成为制约土遗址锚固技术和理论发展的关键问题之一。对质量浓度分别为0.5%、1.0%、1.5%的SH与黏土、粉煤灰拌和组成SH混合浆液试块进行物理、力学、声波特性测试以及基于该类型混合浆液分别同木锚杆、玻璃纤维锚杆、钢筋锚杆组成的不同锚固系统的原位锚固、拉拔测试和杆体-浆体界面应力-应变监测。获取了3种锚固系统的破坏模式、锚固性能和杆体-浆体界面应力-应变的时空分布规律。试验结果表明:SH锚固浆液拥有良好的物理、力学性能,与土遗址构筑材料性能兼容;基于SH锚固浆液全长灌浆的3种锚固系统的锚固性能优良;木锚杆锚固系统锚固性能在SH浓度为1.0%时达到最优,而玻璃纤维和钢筋锚杆锚固系统锚固性能良好度随着SH的浓度升高而升高。研究结果为以SH为主材的改性浆液在土遗址锚固领域中的应用提供了依据和参考。

Anchorage technology has been widely employed in the field of earthen sites＇ stability controlling.However,the lack of anchorage slurry is one of key problems in the development of anchorage technology and theory. Physical,mechanical and acoustic properties of the modified SH-（ C＋F） mortar specimens were tested. The specimens are composed of clay fly ash and SH whose concentrations are 0. 5%,1. 0%,1. 5%respectively. In-situ anchoring,pull out tests and stress-strain monitoring of the interface between bolt and slurry of the anchoring systems are carried out. The systems are made up of mixed slurry and wood bolt,glass fiber reinforced plastic,and reinforced bar. The test results reveal the failure mode,anchorage performance,spatial and temporal distribution law of stress-strain on the blot-slurry interfaces of three types of anchorage systems. The test results show that SH-（ C＋ F） mortar has better physical and mechanical properties,and better compatibility with earthen sites. Theanchoring performance of the three kinds of anchorage systems with the full length grouting of SH anchorage system is excellent. Anchoring performance of wood bolt anchorage system achieves optimal when its concentration is 1%,while anchorage performance of glass fiber reinforced plastic and reinforced bar anchoring system behaves better with the increase of concentration of SH.The research findings provide a basis and a reference for the application of SH-based modified slurry in the field of earthen sites anchoring.