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预紧力及间排距影响下的锚杆(索)附加应力场研究 预览 被引量:1

Study on the additional stress field of bolt(cable)under the influence of pretension and spacing
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摘要 以华烨煤业5号煤层为研究对象,采用数值模拟方法,对预紧力、间排距及锚索布置方式影响下的锚杆(索)附加应力场进行研究。结果表明,单根锚杆(索)附加压应力集中在托盘附近,并向围岩深部逐渐减小,附加拉应力集中在锚固段及其上部区域;锚杆(索)附加应力峰值随预紧力增大而线性增大;锚杆群在围岩浅部形成附加压应力区,其均匀程度、连续程度以及影响范围随间排距增大而减小;锚索可显著扩大锚杆产生的附加压应力区,并使锚杆锚固段附近的附加拉应力区转变为压应力区。 Taking No.5 coal seam of Huaye Mine as the research object,numerical simulation method was used to analyze the additional stress field of bolt(cable)under the influence of pretension,spacing and the layout of cables.The results showed that the single bolt(cable)additional compressive stress concentrated near the tray,and decreased gradually to the deep surrounding rock,the additional tensile stress concentrated in the anchorage section and the upper area;the additional stress peak of bolt(cable)linearly increased with the increase of pretension;the additional compressive stress zone was formed in the shallow part of the surrounding rock by the bolts,the uniformity,continuity and influencing range decreased with the increase of spacing;the cables can significantly expand the additional stress zone generated by the bolts,and convert the additional tensile stress into compressive stress near the anchorage section of the bolts.
作者 李鹏 Li Peng (Shanxi Institute of Energy, Jinzhong, Shanxi, 030600, China)
机构地区 山西能源学院
出处 《中国煤炭》 2018年第8期68-71,98共5页 China Coal
基金 国家科技支撑计划项目(2012BAB13B04)
关键词 锚杆 锚索 预紧力 间排距 附加应力场 bolt cable pretension spacing additional stress field
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