爆炸波作用下锚杆间距对围岩加固效果影响的模型试验研究  

MODEL EXPERIMENT STUDY ON INFLUENCES OF REINFORCEMENT ON INTERVALS OF ROCK BOLTS IN SURROUNDING ROCK UNDER EXPLOSIVE WAVES

作　　者：杨自友[1] 顾金才[2] 陈安敏[2] 徐景茂[2] 

机构地区：[1]中国科学技术大学近代力学系,安徽合肥230026 [2]总参工程兵科研三所,河南洛阳471023

出　　处：《岩石力学与工程学报》2008年第4期757-764,共8页Chinese Journal of Rock Mechanics and Engineering

摘　　要：为比较锚杆间距对洞室围岩加固效果以及抗爆性能的影响程度大小,通过实验室地质力学模型试验,研究在集中装药爆炸应力波作用下,2种长度相同而间距不同的锚杆对洞室围岩的不同加固效果。比较和分析因锚杆间距不同所造成的洞室围岩中测点的应力、洞壁表面应变、洞室顶底板相对位移、顶底板及侧墙加速度和洞室围岩宏观破坏形态的差别。试验结果表明,与较大间距锚杆加固的洞室相比较,较小间距锚杆加固的洞室围岩中应力较大,洞壁表面应变、顶底板相对位移、顶底板加速度较小,加固区域内围岩无破坏裂纹,说明对洞室围岩的加固宜采用较小间距锚杆。将部分试验数据同相应的数值分析结果进行比较发现,两者的拱顶应力峰值和顶底板相对位移峰值较为一致,证明模型试验结果是可靠的,对防护工程设计及坑道围岩加固具有一定参考价值。For the purpose of the comparison of the influences of rock bolts＇ intervals on reinforcement effects and anti-detonating characteristics of surrounding rock around two underground openings, the different reinforcement effects of two kinds of rock bolts, which have the same length and the different intervals in surrounding rock of two underground openings, are studied by model experiments of geomechanics under the effect of explosive stress waves produced by focus charging. Because of the differences of the intervals of the rock bolts, the distinctions of stress in surrounding rock, surface strain of two underground openings, the roof-to-floor relative displacements of two underground openings, accelerations of roof, floor, sidewall and macroscopic damage forms are compared and analyzed. By comparing the caverns reinforced by the large intervals of rock bolts, the results show that the wall rock＇s stress is relative larger in surrounding rock of the underground opening reinforced by the small intervals of rock bolts. However, the surface strain of the underground opening, the relative roof-to-floor displacements and the accelerations of roof and floor of the underground opening reinforced by the small intervals of rock bolts are relative smaller： and there is no cracks in the reinforcement zone. These conditions indicate that the small interval of rock bolts should be used to reinforce the surrounding rock of underground openings. The corresponding numerical analysis of model experiment is carried out. Some parts of the model test data are compared with the results of numerical analysis. The peak values of the vault stress and the roof-to-floor displacements of model test are consistent with numerical analysis. The experimental result is reliable, and this can provide references to the design of protective projects and the reinforcement of the wall rock and tunnels.

关 键 词：数值分析 爆炸波 加固效果 模型试验 

分 类 号：O241[理学—计算数学]