摘要
混凝土结构裂缝及渗漏水是公路隧道衬砌结构的通病,采用微膨胀混凝土可以增加地层弹性抗力,并提高衬砌结构的压应力,改善衬砌抗拉、抗裂性能。为了定量化分析衬砌结构采用微膨胀混凝土后的地层弹性抗力提高幅度,采用了缩尺寸模型试验的方法,通过测试模型隧道衬砌结构所受地层弹性抗力可以推算原型隧道所受地层弹性抗力,为此首先需要弄清两者之间的相似比。根据地层弹性抗力及其与衬砌结构膨胀力的相互作用机理,推导出了地层弹性抗力相似比理论公式,影响相似比大小的因素包括原型隧道与模型隧道之间的半径、厚度、弹性抗力系数、弹性模量等比例关系。最后,采用有限元软件建立了弹性支点法数值计算模型,通过对比地层弹簧的轴力及折算地层弹性抗力,进一步验证了地层弹性抗力相似比解析公式的正确性。
Concrete structure cracks and leakage of water are two common diseases in highway tunnel lining structures.Micro expansive concrete can increase the elastic resistance and pressure stress,which result in improving the anti-tensile and anti-crack performance.In order to evaluate the effect of expansive concrete,a test model adopted and the elastic resistance pressure measured to estimate the real pressure in prototype tunnel.Therefore,the first thing is to ascertain the similarity ratio between prototype and model.According to the interaction mechanism between elastic resistance and the lining expansion force,similarity ratio formula of elastic resistance was theoretically,which relative with radius and thickness,and elastic resistant coefficient,elastic modulus.Finally,a numerical calculation model of elastic fulcrum method established by using finite element software.By comparing the axial force of formation spring and the elastic resistance of stratum,the correctness of analytic formula for elastic resistance of stratum is further verified.
作者
郑国平
李伟平
刘学增
周红升
Zheng Guoping;Li Weiping;Liu Xuezeng;Zhou Hongsheng(Shanghai Tongyan Civil Engineering Technology Co. Ltd.,Shanghai 200092,P.R. China;Zhejiang Provincial Plan Design & Research Institute of Communications,Hangzhou 310006,P.R. China)
出处
《地下空间与工程学报》
CSCD
北大核心
2018年第S2期559-564,共6页
Chinese Journal of Underground Space and Engineering
基金
浙江省交通运输厅科研计划项目(201603
2015J05)
关键词
隧道衬砌
微膨胀混凝土
模型试验
相似比
road tunnel lining
expansive concrete
model test
similarity ratio
