边坡复合锚固支护技术模型试验研究

Study of Composite Bolts Supporting Technology for Slope Prevention by Model Experiment

岩土工程中边坡锚固技术一直以来是学者们研究的热点问题。目前,由于注浆技术的限制,边坡锚固技术中依然主要采用的是俯斜式锚杆群锚的方式。该类锚固形式中锚杆与滑面近于正交,不能充分发挥锚杆的抗拉拔性能。鉴于此不足,文中提出了一类新型复合边坡锚固支护技术,并基于该复合锚固技术进行了室内模型试验。试验结果表明,运用新型复合锚杆支护后的边坡在初始变形时,承受荷载的能力比传统锚杆提高了约34%,达到破坏时其承载能力比传统锚杆支护的边坡提高了约2倍。同时,传统锚固形式边坡破坏变形量较大,位移随荷载的陡增现象不明显,边坡呈现的是柔性破坏;相反,采用复合锚固形式的边坡破坏变形量较小,位移随荷载陡增现象明显,边坡破坏更趋近于脆性破坏。

Slope anchorage technology has been the hot problems for scholars research in geotechnicai engineering. At present, due to the limitation of grouting technique, the engineers still mainly use group looking-down bolt to protect the slope. In this kind of protection, the bolt and sliding surface are nearly orthogonal. It cannot give full play to the bolt drawing resistance. In view of this insufficiency, this article puts forward a new type of composite slope anchor support technology. Based on the composite anchorage technology, the article has carried out the indoor model experiment, and the results show that the slope at the time of initial deformation under load capacity by the new composite bolt will raise about 34% higher than that of conventional anchor, and its bearing capacity reaching damaged than the traditional bolting slope by about 2 times. The displacement along with the load for traditional anchorage form have larger displacement, at the same time, the correlation between them is not obvious, which result to slope damage being flexible; instead, with composite anchorage forms of slope has smaller deformation, the correlation between them is obvious, which leads to slope damage being brittle.