摘要
环境湿度变化引起的干缩应力对于隧道衬砌的影响不容忽视,因此分析干缩影响下的应力以及位移也显得尤为重要。基于微分方程理论,在考虑隧道衬砌与周围岩体之间的相互作用力的基础上,推导了隧道干缩应力的计算公式,以及干缩应力作用产生的不同位置下的衬砌位移和裂缝宽度,并分析了影响干缩应力大小的各种因素,最后与有限元软件进行的模型计算结果进行了对比验证,证明了公式的适用性。计算结果表明:干缩应力在衬砌开裂段中点处达到最大值,并向两端逐步减小;干缩应力引起的位移变化规律则恰好相反;该计算模型和有限元模型有着较好的符合性。
The influence of drying shrinkage stress caused by humidity change on tunnel lining structure can not be ignored.Therefore,it is very important to analyze the stress and displacement under dry shrinkage.Based on the differential equation theory,the calculation formula of the tunnel dry shrinkage stress,the lining displacement and the crack width generated by the dry shrinkage stress are derived with the consideration of the interaction force between the tunnel lining and the surrounding rock mass.The factors affecting the size of the dry shrinkage stress are analyzed.To prove the applicability of the formula,the result of the model calculation is compared and verified with the result of finite element software.The results show that the dry shrinkage stress reaches a maximum in the middle of the tunnel and decreases towards cracks gradually;the displacement changes with the opposite rule;the calculation model is in conformity with the finite element model.
作者
余俊
文振帆
刘卓航
赵爽
陈伟斌
Yu Jun;Wen Zhenfan;Liu Zhuohang;Zhao Shuang;Chen Weibin(School of Civil Engineering,Central South University,Changsha 410000,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2020年第S02期582-587,共6页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51008311)
关键词
隧道
干缩应力
衬砌位移
裂缝
tunnel
dry shrinkage stress
lining displacement
crack
