考虑施工过程的软弱破碎围岩隧道管棚法超前支护的敏感性分析  

Sensitivity Analysis of Pipe Roofing Method for Advanced Support of Tunnels in Weak and Broken Surrounding Rock Considering the Construction Process

作　　者：郭柏里 杨源源 GUO Baili;YANG Yuanyuan(Sinohydro Bureau 7 Co.,Ltd.,Chengdu,Sichuan Province,610213 China)

机构地区：[1]中国水利水电第七工程局有限公司,四川成都610213

出　　处：《科技创新导报》2021年第24期31-34,共4页Science and Technology Innovation Herald

摘　　要：隧道穿越破碎带地层时,由于围岩松散柔软,自稳能力差,一般的先开挖后支护会对开挖面围岩造成扰动,使隧道结构发生较大的变形和沉降。超前大管棚支护用在软弱地层隧道中施工能有效抑制隧道结构和围岩的变形,支护工艺所需材料由钢管和水泥砂浆组成。在工程实践中,管棚法的应用效果主要取决于管棚直径、布置范围、环向间距等因素。本文依托实际隧道工程,对管棚直径、布置范围、环向间距三方面因素对隧道最大沉降的影响效果进行敏感性评价。When the tunnel traverses the stratum in the fracture zone,the surrounding rock is loose and soft,so the self-stabilization ability is poor.Generally,excavation before support will disturb the surrounding rock of the excavation face,resulting in large deformation and settlement of the tunnel structure.The advanced large pipe shed support used in the construction of soft ground tunnels can effectively suppress the deformation of the tunnel structure and surrounding rock.The materials required for the support process are composed of steel pipes and cement mortar.In engineering practice,the application effect of the pipe shed method mainly depends on factors such as pipe shed diameter,layout range,and circumferential spacing.Relying on the actual tunnel project,this paper evaluates the sensitivity of the influence of the pipe shed diameter,the layout range,and the circumferential spacing on the maximum settlement of the tunnel.

关 键 词：隧道 管棚 最大沉降 敏感性分析 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]