新型复合锚固结构静力弱化效应影响因素试验研究

在新型复合锚固结构静力单轴试验研究中,进行了3组影响弱化效应的对比试验,即考虑了不同比面积、不同材料强度、不同弱化孔深度3组单因素。试验结果表明：①在3组单因素对比试验中,比面积较大、材料强度较高、弱化孔较深的3组试件,均存在更为明显的弱化效应;②锚固区厚度为第4个影响弱化效应的因素;③比面积、弱化孔深、锚固区厚度均存在最佳值,可使弱化效应最优;④弱化效应的机理是：在锚固区厚度足够条件下,弱化区一般要经历变形—大变形—压裂—压碎—压实的各个阶段,与此同时吸收大量爆炸能,使锚固区（包括洞室表面）的危机得以转移,因而潜藏有巨大的经济技术效果。本次试验研究为新型复合锚固类结构的弱化效应优化设计提供了必要的依据。

Experimental study on the influence factors of static weakening effect of new composite anchorage structure

In the study of the static uniaxial test of the new composite anchorage structure, three groups of comparative tests were carried out, that is, different specific area, different material strength and different weakening hole depth were considered. The test results show that: (1) In the three groups of single factor comparison test, the three groups of specimens with larger area, higher material strength and deeper weakening hole have more obvious weakening effect; (2) The thickness of anchoring zone is the fourth factor affecting weakening effect; (3) The specific area, weakening hole depth and anchoring zone thickness all have the best values, which can make the weakening effect optimal; (4) The mechanism of the weakening effect is that under the condition that the thickness of the anchoring zone is sufficient, the weakening zone generally goes through various stages of deformation - large deformation - fracturing - crushing - compaction, and at the same time absorbs a large amount of explosion energy, so that the crisis of the anchoring zone (including the surface of the cavity) can be transferred, and therefore has huge economic and technical effects. The experimental research provides the necessary basis for the optimization design of the weakening effect of the new composite anchorage structure.