摘要
采用LS-DYNA有限元软件,对分别使用单一锚固结构和新型复合锚固类结构加固的洞室在抗爆炸荷载作用下的性能进行了数值模拟。分析了在爆炸条件下应力波传播及爆坑形成过程、爆炸近区围岩中的压力波和复合锚固结构构造措施断裂缝形成过程,与试验结果的可靠性相互验证,并对其作用机理得出一些初步认识。结果表明:两个模型的计算爆坑大小与试验结果基本吻合;复合锚固构造措施段使得锚固区外的介质内出现了局部自由面,当爆炸应力波经过自由面时产生反射拉伸波在此处产生了裂缝;复合锚固结构洞室拱顶垂直向振动加速度峰值比单一锚固结构洞室的约小23.7%;单一锚固结构洞室比复合锚固结构洞室更容易出现结构性的冲切破坏和拉伸剥落破坏。
The finite element commercial code LS-DANA is used to study the tunnel anchored with single anchorage structure or new type composite anchorage structure under explosive loading.The course come into being on shock wave and explosive pit and the pressure wave in wall rock about explosion and the crack in constructional part of composite anchorage structure under explosive loading is analyzed.The dependability of the experimental results is validated;and some elementary cognition is acquired on the mechanism.The results show that: the size of the explosive pit about the two models is tallied to the experimental results;the constructional part of composite anchorage structure mades the medium come forth part free surface outside anchored area,when explosive shock wave by free surface bring reflect elongate wave then produce the crack;the peak value of plumb vibrational acceleration on composite anchorage structure tunnel vault is 23.7 % less than single anchorage structure tunnel;single anchorage structure tunnel is easier come forth structure-breaking and elongate desquamate wreck than composite anchorage structure.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第S1期255-259,266,共6页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.10772199)
关键词
复合锚固类结构
抗爆性能
数值模拟
composite anchorage structure
explosive-proof performance
numerical simulation
