摘要
依托某深埋公路隧道,利用施工监控量测技术获取围岩变形,选取Cvisc模型作为地层围岩本构模型描述其蠕变特性;通过BP神经网络获取蠕变参数,分析隧道在整个运营期间内不同关键蠕变时刻下围岩与支护结构受力变形随时间的变化规律,计算结果表明:基于隧道实测变形所选取的Cvisc模型能够较好描述高应力作用下软岩的蠕变特性;对于该隧道当前支护结构形式来说,在围岩蠕变作用下衬砌结构内力较大,后期运营期间可能出现衬砌开裂等病害;为提升隧道结构在后期运营过程的长期安全性与耐久性,应从围岩蠕变的观点出发,减少围岩蠕变的影响,增强围岩长期强度。
Based on a deep-buried highway tunnel,the deformation of the surrounding rocks Swas obtained using construction monitoring and measuring technologies.The Cvisc model was chosen as an ontological model of the stratum surrounding rocks to describe their creep behaviors.The creep parameters were collected by the BP neural network to analyze the change law of the force and deformation of the surrounding rock and support structure with time under different critical creep moments during the whole operation period of the tunnel.The calculation results showed that the actual tunnel deformation-based Cvisc model could well describe the creep behavior of the soft rock under high crustal stress.For the current support structure of the tunnel,the internal force of the lining structure under the creep effect of the surrounding rock was large,which might cause lining cracking diseases during the later operation period.To improve the long-term safety and durability of the later operation period of the tunnel structure,the creep effect should be reduced and the long-term strength of the surrounding rock should be enhanced.
作者
杨嵩桥
YANG Songqiao(Shanxi Road&Bridge Construction Group Co.,Ltd.,Taiyuan,Shanxi 030006,China)
出处
《山西交通科技》
2025年第1期96-99,共4页
Shanxi Science & Technology of Transportation
