非对称截面浅埋偏压地形小净距隧道扁平率合理取值:以新疆乌尉高速上新光隧道工程为例  

Reasonable Value of Flatness Ratio for Small Clear Distance Tunnels in Asymmetric Cross Section Shallow Buried Eccentric Terrain: Taking the Xinjiang Wuwei Expressway Shangxinguang Tunnel Project as an Example

作　　者：冯世展 梁斌[1] 黄光友 李文杰[1] FENG Shi-zhan;LIANG Bin;HUANG Guang-you;LI Wen-jie(School of Civil Engineering and Architecture,Henan University of Science and Technology,Luoyang 471000,China;CCCC-SHEC Forth Engineering Co.,Ltd.,Luoyang 471013,China)

机构地区：[1]河南科技大学土木建筑学院,洛阳471000 [2]中交二公局第四工程有限公司,洛阳471013

出　　处：《科学技术与工程》2024年第24期10528-10537,共10页Science Technology and Engineering

基　　金：国家自然科学基金(U1604135);中交第二公路工程局有限公司重点科技研发项目(RP2022011745);河南省科技厅产学研合作项目(2015HNCXY011)。

摘　　要：为研究浅埋偏压小净距隧道扁平率的合理取值范围,依托新疆上新光隧道工程,基于围岩变形理论,运用数值模拟的方法分析不同扁平率条件下隧道围岩稳定性,讨论小净距隧道扁平率的取值,结合现场监测数据对扁平率范围的合理性进行验证,最终得出小净距隧道扁平率的合理范围。结果表明:小净距隧道的扁平率对围岩塑性区分布、地表沉降、中夹岩水平位移、拱顶沉降和支护形变量均有影响;以0.432扁平率为基础值,随着隧道扁平率的不断增加,整个隧道围岩稳定性不断降低,0.432~0.654为隧道最佳扁平率范围;隧道模型计算结果与现场实测数据之间平均误差在5%~14%,以此来验证数值模拟的可靠性,证明了该计算方法的可信度;选取优化后隧道截面进行施工,与现场监测数据进行对比,进而验证优化后扁平率取值的正确性。In order to study the reasonable range of flattening rate for shallow buried bias pressure small clear distance tunnels,based on the theory of surrounding rock deformation and numerical simulation,the stability of tunnel surrounding rock under different flattening rate conditions was analyzed.The value of flattening rate for small clear distance tunnels was discussed,and the rationality of the flattening rate range was verified by on-site monitoring data.Finally,the reasonable range of flattening rate for small clear distance tunnels was obtained.The results show that the flattening ratio of small clear distance tunnels has an impact on the distribution of plastic zone in surrounding rock,surface settlement,horizontal displacement of intermediate rock,arch settlement,and support shape variables.Based on the basic value of 0.432 flattening ratio,as the tunnel flattening ratio continues to increase,the stability of the surrounding rock of the entire tunnel continues to decrease,with 0.432~0.654 being the optimal flattening ratio range for the tunnel.The average error between the calculation results of the tunnel model and the on-site measured data is between 5%and 14%,which verifies the reliability of the numerical simulation and proves the credibility of the calculation method.Select the optimized tunnel section for construction and compare it with on-site monitoring data to verify the correctness of the optimized flatness ratio value.

关 键 词：非对称截面 浅埋偏压地形 小净距隧道 围岩形变理论 扁平率 

分 类 号：U455[建筑科学—桥梁与隧道工程]