摘要
采用能量分析法将让压锚杆的荷载-位移曲线划分为弹性阶段、让压阶段和塑性强化阶段.分别推出3个阶段让压锚杆的能量本构方程以及围岩作用下的能量方程.近似求解让压锚杆和普通锚杆在弹性极限荷载、承载力极限以及围岩共同作用条件下的支护性能.结果表明:在3种不同条件下,让压锚杆的支护能力较普通锚杆分别提升了52.3%,211.2%,77.3%.依据组合拱理论给出了让压锚杆的支护数量、间距、长度、最大预留空间等参数的理论公式.
Based on energy analysis method, the load-displacement curves of yielding anchor bolt were divided into elastic stage, release-pressure stage and plastic hardening stage. Energy constitutive equations of yielding anchor bolt in these three stages and energy equa.tion of an- choring body under surrounding rock effect were calculated and presented. Approximate solu- tions of support capacity of normal yielding anchor bolt and normal blot were given under de- sign load, bearing capacity and interaction between bolt and surrounding rock. The results show that the support capacity of yielding anchor bolts incresed by 52.3%, 211.2%, 77.3% than the conventional bolts. Based on combined arch theory, the theorical calculating formulae of yielding anchor bolt＇s design parameter, such as quantity, spacing, length and the maximum reserved space and so forth, are given.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2014年第2期241-247,共7页
Journal of China University of Mining & Technology
基金
教育部博士学科点专项科研基金项目(20120023110009)
关键词
让压锚杆
能量本构模型
力学分析
支护参数计算
yielding anchor bolt
energy constitutive model
mechanical analysis
support pa- rameters calculation
