黄土地表裂缝渗水影响下隧道衬砌结构分析  

Analysis of tunnel lining structure under the influence of loess surface crack seepage

作　　者：吕硕 Lv Shuo(Gansu Province Transportation Planning Survey and Design Institute Co.,Ltd.,Lanzhou Gansu 730030,China)

机构地区：[1]甘肃省交通规划勘察设计院股份有限公司,甘肃兰州730030

出　　处：《山西建筑》2023年第12期180-183,共4页Shanxi Architecture

摘　　要：根据黄土隧道洞顶灌溉区裂缝对水流入渗规律的影响,结合裂缝发育情况、是否渗水、渗水深度等参数,组合形成不同的分析工况,进行数值模拟计算,评价不同工况对结构安全的影响。研究表明:当隧道洞顶裂缝发育时,在考虑洞顶渗流情况下,结构安全系数不满足规范要求的最小安全系数,土体中裂缝的发育程度是影响灌区隧道结构安全的重要因素;在裂缝不发育的情况下,渗流对隧道的影响直观的表现为荷载的增加,并无弱化洞周围岩的作用,其对其衬砌安全系数的影响也较小。In this paper,according to the influence of cracks on water infiltration in the irrigation area of the loess tunnel roof,combined with the parameters of crack development,whether water seepage,depth of water seepage and other parameters,different analysis conditions are combined to form a numerical simulation calculation to evaluate the impact of different conditions on the structure safety.The research shows that when the tunnel roof cracks develop,the structural safety factor does not meet the minimum safety factor required by the specification when considering the seepage at the top of the tunnel,and the development degree of cracks in the soil is an important factor affecting the structural safety of the tunnel in the irrigation area.In the case of undeveloped cracks,the influence of seepage on the tunnel is directly shown as the increase of load,without weakening the effect of rock around the tunnel,and its impact on the safety factor of its lining is also small.

关 键 词：隧道工程 黄土地区 水浇地 裂缝 安全系数 

分 类 号：TU942[建筑科学—建筑技术科学]