拱部侧爆应力波传播及围岩裂纹形成数值分析  

Numerical Analysis of Stress Wave Propagation and Crack Formation of Surrounding Rock under Explosion Load from Side of Arch

作　　者：余永强[1] 王超[1] 王光勇[1,2] 

机构地区：[1]河南理工大学土木工程学院,焦作454000 [2]中国科学技术大学近代力学系,合肥230026

出　　处：《爆破》2013年第4期9-13,共5页Blasting

基　　金：国家自然科学基金项目(41072225);河南省科技厅重点攻关项目(092102310313)

摘　　要：利用有限元程序LS_DYNA3D,对拱侧集中装药爆炸下,应力波与毛洞及锚固洞室围岩相互作用的过程进行了数值分析。结果表明:模拟、实测爆心径向等比例测点压应力时程曲线特征较为一致,说明模拟结果之间具有可比性,且有较高置信度;拱部侧爆下,球面应力波以爆心为中心扩散传播并快速衰减,经自由边界反射形成拉伸波,随着拉伸波的传播与叠加,造成围岩受拉破坏,形成裂纹主要分布在爆源上方近自由表面处、洞室外围迎爆部及迎爆侧拱部,迎爆侧拱部围岩破坏严重,易对洞室安全造成不利影响;锚固结构能够提高围岩的抗爆性能,减轻洞室整体的破坏程度,限制围岩沿洞室径向的位移。The interaction between stress wave and cave surrounding rock under explosion load from side of arch was numerically analyzed by LS_DYNA3D finite element program.Results showed that the character of pressure stress time history cures of simulation and test at the equal proportion distance measure point were similar,which means results can be compared with each other; the spherical stress wave spread around explosion center and decayed fast; racks of surrounding rock were produced by tensile wave reflected from free surface,and mainly distributed on free surface nearby at top of explosion center,cave periphery and faced area of explosion center; the surrounding rock of cave haunch was destroyed most seriously under explosion load from arch side,making a negative effect on the safety of cave; anchor structure could enhance the tensile strength of surrounding rock,and alleviate the damage to reinforced cave and restrict the displacement of surrounding rock in the radial direction of cave.

关 键 词：岩石力学 抗爆性能 数值模拟 应力波 围岩裂纹 

分 类 号：TU457[建筑科学—岩土工程]