摘要
为了提高巷道围岩锚固体的强度、刚度和抗变形能力,基于锚杆(索)锚固作用机理,提出了"高预紧力、高强度、高刚度、高锚固力和低密度"的设计理念。采用高强锚杆(索)及组合构件作为锚固材料,利用连锁构件将锚杆(索)群进行横向与纵向的连锁,通过给锚杆(索)提供高锚固力和高预应力,从本质上调动锚杆(索)群的主动锚固作用,使其与锚固岩体共同形成有机的承载结构,有效减小巷道围岩变形与破坏,改善巷道安全状况。现场试验表明,这样的设计理念和技术应用,能够较好地解决巷道围岩顶板断裂节理发育、变形不均匀和掘进速度慢等问题,具有合理性与适用性,同时可产生良好的经济效益,值得应用和推广。
To enhance the strength, stiffness, and anti-deformation ability of anchored mass in sur- rounding rock, a design concept of ＂hard preload, high strength, high stiffness, high anchored stress and low density＂ is introduced based on the anchorage mechanism of anchors. In the on-site experiment, high strength anchor bolts and the components are used as the anchorage materials, and linkage compo- nents are adopted for the sake of crosswise and longitudinal linkages of the anchor bolt group. Then, ac- tive anchorage effects are achieved by raising anchored stress and hard preload of the anchor bolt group. In this way, the anchor bolts and anchored mass constitute a bearing structure, which can decrease the deformation and damage of the surrounding rocks, and improve the safety situation of roadway. The experiment results show that this design concept and its application can well solve such problems as breaking joint development, uneven deformation of roadway roof and low speed excavation. Marked by its validity, applicability and potential economic interests, this design concept is worth applying andpromoting.
出处
《采矿与安全工程学报》
EI
北大核心
2012年第5期662-667,共6页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51174196)
中国矿业大学青年科技基金项目(2010QNB27)
关键词
预应力锚杆(索)
连锁构件
锚固体
强度
刚度
pre-stressed anchors
linkage components
anchored mass
strength
stiffness
