粉质黏土混合花岗岩地段边坡/隧道方案优选研究  

Optimization of Slope/Tunnel Excavation Plan Selections in Silty Clay Mixed with Granite Slope

作　　者：支有 杨兴洪 王红星 余风 ZHI You;YANG Xinghong;WANG Hongxing;YU Feng(Yunnan Constructions Investment Group Highway Construction Co.Ltd.,Kunming 650200)

机构地区：[1]云南交投集团公路建设有限公司,昆明650200

出　　处：《土工基础》2024年第2期204-208,共5页Soil Engineering and Foundation

基　　金：云南交投集团公路建设有限公司自立课题。

摘　　要：在公路工程建设中天然边坡常面临不同的开挖方案选择。云南某公路边坡设计提出了路堑开挖和隧道开挖两种方案,为了选择合理的开挖方案,采用了二维数值模拟方法,对原始边坡和两种不同开挖方案下的边坡进行稳定性分析,并对它们开展了受力和变形特征的对比研究。研究结果表明:对于隧道开挖方案,未经支护的隧道安全系数较低易发生失稳破坏,在采取支护措施后安全系数满足规范要求,但隧道拱脚上方仍存在张拉破坏风险;对于路堑开挖方案,边坡安全系数满足规范要求,公路周围岩体的整体变形较小且应力应变均处于安全范围内,故最终确定该工程边坡进行路堑开挖更为合理。In highway engineering construction,natural slopes often face different excavation options.Cutting excavation and tunnel excavation are proposed in the slope design of a project.To select a reasonable excavation option and construct the slope with more stable and safer after the excavation,the stability of the original slope and the slope under two different excavation and support plans are evaluated by using a two-dimensional numerical simulation method.Furthermore,the stress and deform-ation characteristics of the two excavation options are compared.The analysis and evaluation results show that:for the excava-tion tunnel option,the factor of safety for the tunnel without support is low and prone to failure.The factor of safety meets the code requirements after the support measures were implemented,but there is still a risk of tensile failure above the tunnel arch.For the cutting excavation option,the overall deformation of the rock mass around the highway is small and the stress and strain are all in the safe range.The factor of safety of this slope meets the code requirements.Therefore,it is more reasonable to determine the engineering slope for cutting excavation.

关 键 词：边坡 支护 数值模拟 安全系数 开挖方案 

分 类 号：U456[建筑科学—桥梁与隧道工程]