摘要
支护体与围岩在刚度、强度和结构上的不耦合是影响煤巷围岩稳定性的主要原因.为了提高煤巷锚杆支护的效果,避免围岩的有害变形,提出采用高强度、高刚度锚杆组合支护系统.本文根据锚杆锚索支护与围岩的相互作用原理,从"两径"配合、锚固长度、锚杆布置以及锚索与锚杆的材料性能耦合等方面,对锚杆锚索支护的刚度问题进行了分析.结果表明:钻孔直径与锚杆直径差以及锚固方式对锚固体的刚度有重要影响;锚杆布置方式和锚杆布置密度对锚固体的破坏方式作用明显.据此提出了提高锚杆锚索体刚度的技术对策.
The non-coupling between support system and surrounding rocks in stiffness, strength, and structure is major influential factor on the stability of the coal roadway. In order to enhance the effect of bolt-anchor cable for roadway supporting and to avoid harmful distortion of surrounding rock, high strength and high rigidity combination anchor supporting system was put forward. According to the mutual mechanism between bolt-cable and surrounding rock, the rigidity of bolt-anchor cable was analyzed in the aspects of ＂two diameters＂ matching, anchor length, anchor arrangement, physical property coupling between bolt and cable. The result shows that 1）the diameter difference between borehole and bolt and anchoring way has a significant effect on stiffness of the anchored body, and 2） the bolt arrangement and the bolt density has an obvious effect on failure mode of the anchoring body. On the basis of this, some controlling countermeasures have been proposed to improve the stiffness of bolt-anchor cable.
出处
《采矿与安全工程学报》
EI
北大核心
2007年第4期396-400,共5页
Journal of Mining & Safety Engineering
基金
安徽省自然科学基金项目(070414169)
安徽省教育厅自然科学基金项目(KJ2007A116ZC)
关键词
锚杆
力学原理
刚度
锚索
耦合分析
控制对策
bolting
mechanical principles
rigidity
anchor cable
coupling analysis
controlling countermeasure
