隧道缺陷衬砌内层补强结构稳定性研究

发布时间：2018-01-06 22:02

本文关键词：隧道缺陷衬砌内层补强结构稳定性研究　出处：《公路工程》2017年05期 　论文类型：期刊论文

【摘要】：二次衬砌缺陷条件下内层补强结构稳定性一直是深埋交通隧道工程中的关键科学问题。建立有限元结构-荷载ANSYS数值力学模型,研究某深埋隧道缺陷衬砌内层补强加固效果、变形特性,以及力学响应。研究表明:在深埋V级围岩条件下,隧道素混凝土二衬结构拱顶属于抗拉控制,承载力、安全系数、结构拉应力均不满足要求,结构不安全,需采取加固措施;内层采用C35厚度30 cm钢筋混凝土补强后,衬砌结构承载力满足要求。采取内层补强措施,即在原缺陷衬砌内侧套打钢筋混凝土衬砌补强,补强后衬砌断面满足规范要求,并不需要拆除原缺陷段衬砌,该方法可大幅度节约成本和提高进度。
[Abstract]:The stability of the reinforced inner structure under the condition of secondary lining defects has been a key scientific problem in the deep buried traffic tunnel engineering. The finite element structure-load ANSYS numerical mechanics model is established. This paper studies the reinforcement effect, deformation characteristics and mechanical response of the defect lining lining of a deep buried tunnel. The study shows that under the condition of deep buried V class surrounding rock, the arch roof of the second lining structure of tunnel plain concrete belongs to tensile control. The bearing capacity, safety factor and tensile stress of the structure are not satisfied with the requirements, and the structure is not safe, so it is necessary to take reinforcement measures. The bearing capacity of the lining structure can meet the requirements after the reinforcement of the inner layer with the thickness of C35 30 cm reinforced concrete, that is, reinforcing the inner lining of the original defect lining with reinforced concrete lining. The lining section after reinforcement meets the requirements of the code and does not need to remove the lining of the original defect section. This method can greatly save the cost and improve the progress.
【作者单位】：中铁二十三局集团第二工程有限公司;
【基金】：国家自然科学基金资助项目(51178399)
【分类号】：U455.91
【正文快照】： 0前言隧道衬砌缺陷条件下结构稳定性一直是工程界和学术界关注的焦点,影响整体结构的使用寿命和行车安全。近年来,特别是西部大开发建设快速发展,大量交通隧道工程建设不断涌现,各种缺陷结构问题相继呈现,给交通工程建设和运营维护带来前所未有的挑战。拆除既有缺陷衬砌重新修

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