浅埋偏压大跨度隧道洞口段地表沉降预测公式适用性研究  

Study on the Applicability of the Surface Settlement Prediction Formula for the Entrance Section of Shallow Buried Bias Large-span Tunnel

作　　者：周长新 王怡凡 李霞 钟海龙 李祥 Zhou Changxin;Wang Yifan;Li Xia;Zhong Hailong;Li Xiang(Shandong Hi-Speed Engineering Construction Croup Co.,Ltd.,Jinan 250014,China;School of Highway,Chang’an University,Xi’an 710064,China)

机构地区：[1]山东高速工程建设集团有限公司,山东济南250014 [2]长安大学公路学院,陕西西安710064

出　　处：《市政技术》2025年第3期192-201,共10页Journal of Municipal Technology

基　　金：山东省工业和信息化厅(企业技术创新项目)(202060103144、202060101409)。

摘　　要：地表沉降预测公式是判断隧道进洞安全稳定性,防止地表不均匀沉陷和开裂的可靠手段,也是预测浅埋偏压大跨度隧道洞口段地表沉降的重要方法。基于浅埋偏压大跨度隧道洞口段地表沉降实测数据,采用参数反分析的方法,对地表沉降预测公式的适用性进行了研究。研究结果表明:浅埋偏压大跨度隧道洞口段地表沉降曲线并非沿隧道中线对称,这与地形地貌、地质条件、岩层走向、施工工序等因素有关;采用Peck经验公式预测浅埋偏压大跨度隧道洞口段地表沉降时,需修正沉降槽宽度系数和沉降槽中心位置,而采用随机介质理论则无需修正,但由于其假定隧道收敛面积等于地表沉降槽面积,因此其预测精度较低,沉降槽计算结果呈扁平状;相比于Peck经验公式,随机介质理论可以预测隧道施工全过程地表沉降情况,且可以评估隧道支护结构的安全稳定性。因此,为确保隧道支护结构安全稳定,应根据隧道变形实测数据,采用随机介质理论进行地表沉降计算。The formula for predicting surface subsidence is a reliable means of assessing the safety and stability of tunnel entry,preventing uneven subsidence and cracking of the surface,and is also an important method for predicting surface subsidence at the entrance of shallow buried and unbalanced large-span tunnels.Based on the measured data,the applicability of the surface settlement prediction formula was studied by parameter reverse analysis method.The research results indicate that the surface settlement curve s of the shallow buried and biased large-span tunnel entrance section is not symmetrical along the tunnel centerline,which is related to factors such as topography,geological conditions,rock strata orientation,and construction processes;When the Peck’s empirical formula is applied to predict the surface settlement,the width coefficient and center position of the settlement groove need to be corrected.However,the stochastic medium theory does not require correction.The tunnel convergence area is assumed to be equal to the surface settlement groove area,and the prediction accuracy is low,and the settlement groove calculation result is flat;Compared with Peck’s empirical formula,the theory of stochastic media can predict the surface settlement during the entire process of tunnel construction and evaluate the safety and stability of tunnel support structures.Therefore,in order to ensure the safety and stability of tunnel support structures,surface settlement calculations should be carried out by stochastic medium theory based on measured tunnel deformation data.

关 键 词：浅埋偏压隧道 地表沉降预测 沉降槽 Peck经验公式 随机介质理论 反分析 

分 类 号：U459.9[建筑科学—桥梁与隧道工程]