摘要
基于隧道开挖下穿引起既有隧道变形的工况,获得了一种可计算既有隧道受力变形的解析方法。采用修正高斯公式解得既有隧道在盾构下穿作用下的附加应力,将既有隧道视为放置在Kerr地基上的无限长EulerBernoulli梁,结合隧道两端自由的情况获得上覆隧道受力变形响应。案例研究表明:与既有文献离心机试验比较,该方法计算结果符合离心机实测数据;与既有理论和可退化的Pasternak地基模型比较,该方法预测结果更贴近实测数据。进一步参数研究表明:双隧夹角的增大会引起既有隧道位移减小及弯矩增大;既有隧道的位移和弯矩会随着地层损失率的增大近似线性增大;既有隧道位移及弯矩会随着新建隧道埋深的增大逐渐减小。
Based on the condition of tunnel deformation caused by tunneling underlying,a theoretical solution is obtained to calculate the response of existing tunnels.The additional loading upon existing tunnel caused by tunneling underlying can be calculated by modified Gaussian formula.By treating the existing tunnel as Euler-Bernoulli beam lying on Kerr foundation model,the strain and stress response of the overlying tunnel can be obtained by considering the case of freedom at both ends of tunnel.Cases studies show that the solutions of the proposed method have better agreement with the centrifuge data than the existing centrifuge tests.Compared with existing theory and degraded Pasternak foundation model solution,the prediction of the proposed method is close to the measured data.Further study shows that the tunnel displacement decreases with the increment of the skew angle between two tunnels,but the tunnel bending moment increases.The displacement and bending moment of the tunnel increase approximately linearly with the volume loss.Displacement and bending moment of the tunnel decrease as the depth of new tunnel increases.
作者
冯国辉
徐长节
郑茗旺
吴琼
黄展军
程康
FENG Guo-hui;XU Chang-jie;TEY Ming-wang;WU Qiong;HUANG Zhan-jun;CHENG Kang(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China;Center for Balance Architecture,Zhejiang University,Hangzhou,Zhejiang 310028,China;Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering,East China Jiaotong University,Nanchang,Jiangxi 330013,China;Hangzhou Chengdong New City Construction Investment Co.,Ltd.,Hangzhou,Zhejiang 310000,China;Nanchang Rail Transit Group Co.,Ltd.,Nanchang,Jiangxi 330013,China;China Railway 11th Bureau Group Co.,Ltd.,Wuhan,Hubei 430061,China)
出处
《工程力学》
EI
CSCD
北大核心
2023年第5期59-68,共10页
Engineering Mechanics
基金
国家自然科学基金项目(U1934208,52238009,52008373,51878276)
国家杰出青年科学基金项目(51725802)
浙江省自然科学基金项目(LHZ19E080001)
江西省自然科学基金项目(20192ACB20001,20223BBG71018)
浙江大学平衡建筑研究中心配套资金项目(20203512-10C)
南昌轨道交通集团科研项目(2019HGKYB002)。