摘要
地表堆载会引起邻近土体产生沉降变形,进而会对地下空间中的邻近隧道造成安全威胁。为了获得邻近既有隧道受到地表作用的影响,采用Boussinesq解获得地表堆载对邻近既有隧道的竖向附加应力,将既有隧道简化成搁置Vlasov地基模型的欧拉梁,考虑到既有隧道侧向土体影响,进一步获得隧道在邻近堆载作用下的变形响应。通过与既有工程案例数据对比分析可知:该方法理论解析与监测数据较为接近,验证了方法的可靠性;与该方法退化解析对比,本文方法更贴近工程实测数据。参数研究表明:隧道与堆载中心间距的增大会引起隧道纵向位移及内力的减小;堆载荷载的增大会引起隧道纵向位移及内力的增大;随着既有隧道刚度的逐渐增大,隧道纵向位移会逐渐减小,但会引起既有隧道内力的增大。
The surface surcharge leads to adjacent soil subsidence and further threat to the existing tunnels in underground space.In order to obtain the influence of surcharge loading on existing tunnel,the Boussinesq solution was used to obtain the vertical additional stress of the adjacent existing tunnel under surcharge loading,and the existing tunnel was simplified as an infinite Euler-Bernoulli beam lying on Vlasov foundation model.Considering the influence of the lateral soil of the existing tunnel,and then the deformation response of tunnel under surcharge loading can be obtained.Compared with the existing engineering data,the theoretical analysis is approach to monitoring data,and the reliability of the method can be verified.Compared with the degradation analysis of this method,the proposed method is closer to the engineering measured data.The last parameter studies show that the decrease of the longitudinal displacement and internal force of the tunnel with increasing the distance between the tunnel and surcharge.The longitudinal displacement and internal force of the tunnel can be increased with increasing surcharge loading.Increasing the tunnel stiffness not only reduces the longitudinal displacement but increases the internal force of the tunnel.
作者
张涛
欧伟山
齐晓强
ZHANG Tao;OU Wei-shan;QI Xiao-qiang(No.2 Engineering Co.,Ltd.of CCCC Fourth Harbor Engineering Co.,Ltd.,Guangzhou 510000,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)
出处
《科学技术与工程》
北大核心
2023年第2期802-809,共8页
Science Technology and Engineering
基金
国家自然科学基金青年科学基金(41807262)。
