沉管隧道结构纵向受力理论计算模型研究  

Study on Theoretical Calculation Model of Longitudinal Force in Immersed Tube Tunnel

作　　者：魏纲[1,2] 陆世杰 邢建见 Wei Gang;Lu Shijie;Xing Jianjian(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,P.R.China;Department of Civil Engineering,Zhejiang University City College,Hangzhou 310015,P.R.China;Changshu Urban Construction Management ＆ Investment Co.,Ltd.Suzhou,Jiangsu 215500,P.R.China)

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058 [2]浙江大学城市学院土木工程系,杭州310015 [3]常熟市城市经营投资有限公司,江苏苏州215500

出　　处：《地下空间与工程学报》2018年第4期912-919,935,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51178428);浙江省自然科学基金(LZ12E08001)

摘　　要：考虑地基弹性抗力系数K随时间的变化,采用简支梁模型和弹性地基梁—简支梁复合模型,对沉管隧道管节沉放对接阶段结构纵向内力分布进行计算分析。改进半柔半刚性接头等效模型,采用定向支座结合剪切弹簧对接头进行模拟。考虑临时垫块的影响,对现有沉管隧道运营期结构受力计算方法进行修正。依托舟山沉管隧道,对管节结构纵向内力进行分析。研究结果表明:改进的接头模型可实现弯矩传递和两端位移差的限制,具有一定的合理性;某一管节沉放对接完成后,相邻的上一管节临时垫块部位的负弯矩发生较大幅度增大,可能引起该处顶板环向开裂;运营阶段管节临时垫块部位和桩基支承部位的负弯矩较大,需要重点监控。Considering that coefficient of foundation elastic resistance K changes over time,simply supported beam model and elastic foundation beam model-simply supported beam compound model are used to analyze the distribution of longitudinal internal force in tube of immersed tunnel during tube docking. The equivalent model of semi-flexible and semi-rigid joint is improved,adopting a directional support combined with a shear spring to simulate the joint. Considering the influence of cushion block,the existing force calculation method of immersed tube tunnel during service stage is modified. The longitudinal internal force in tube was analyzed based on Zhoushan immersed tunnel. The results show that： the improved joint model can transfer bending moment and limit the displacement difference of the sides of joint,so this joint model has certain rationality. After one tube sinking and docking,the negative bending moment in the position of cushion block of adjacent tube increases substantially,which may lead to circumferential cracking in roof. During service stage,the negative bending moments in the position of cushion blocks and pile cap of tubes are large,so these places are needed to be mainly monitored.

关 键 词：沉管隧道 理论模型 垫块 接头 

分 类 号：U459.5[建筑科学—桥梁与隧道工程]