摘要
为了研究隧道初次衬砌结构在爆破荷载作用下的动力响应,采用现场试验和数值模拟相结合的方法,应用TC-4850测振仪获得3个测点8次监测试验的质点振动速度峰值数据,依据最小二乘法拟合得出质点振动速度峰值传播规律的萨道夫斯基公式;采用LS-DYNA数值模拟软件,定义材料参数及其状态方程,在依据质点振动速度峰值传播规律可靠性分析验证数值模型合理性的基础上,建立隧道初次衬砌结构仿真模型,考虑初次衬砌强度的变化,分析隧道结构关键位置(拱脚、拱腰、拱肩、拱顶)处应力及位移的变化规律.研究结果表明:隧道初次衬砌结构X方向拱脚和拱顶处应力峰值明显大于其余关键位置,Y方向应力峰值出现在拱脚位置,为118100 Pa,Z方向应力峰值同样出现在拱脚处,为239100 Pa,且Z方向应力峰值明显大于X和Y方向;隧道初次衬砌结构位移峰值出现在拱腰位置,为0.361 cm,且Z方向位移峰值出现时间明显早于X和Y方向;在C30的基础上,增加C25和C35初次衬砌强度等级,随着初次衬砌强度的递增,应力呈正相关关系,位移呈负相关关系.
To research the dynamic response of tunnel primary lining structure under blasting loads, the peak data of mass point vibration velocity at 3 measuring points are obtained from 8 monitoring tests using TC -4850 vibrometer by combing field test with numerical simulation. The Sadaovsk formula for the peak propagation rule of the mass point vibration velocity is fitted by least square method. The material parameters and state equation are defined by applying numerical simulation software LS-DYNA . Based on the of the rationality of the numerical model which is verified by the reliability analysis of the peak propagation rule of the mass point vibration velocity, the simulation model of tunnel primary lining structure is established. Considering the strength of the primary lining, the variation rules of the stress and displacement at key positions ( arch foot, haunch, spandrel, vault) of the tunnel structure are analysed. The research result indicates that (1) The peak stresses of the tunnel primary lining structure on the arch foot and vault in Xdirection are obviously greater than those of other key positions. The peak stresses in Y and Z directions are 118 100 Pa and 239 100 Pa respectively which appear at arch foot position, and the peak stress in Z direction is larger than those in X and Y directions.(2) The peak displacement of the tunnel primary lining structure is 0. 361cm at haunch, which is 0. 361cm , and the peak displacement in Zdirection appears earlier than those in X and Y directions.(3) The primary lining strength grades of C25 and C35 are increased in addition to C30. With the increase of primary lining strength, the stress is positively correlated while the displacement is negatively correlated.
作者
胡刚
费鸿禄
包士杰
杨智广
HU Gang;FEI Hong-lu;BAO Shi-jie;YANG Zhi-guang(Institute of Blasting Technique,Liaoning Technical University,Fuxin Liaoning 123000,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2019年第10期83-90,共8页
Journal of Highway and Transportation Research and Development
关键词
隧道工程
动力响应
数值模拟
初次衬砌
爆破
tunnel engineering
dynamic response
numerical simulation
primary lining
blasting
