抢风岭隧道仰拱病害致灾条件数值模拟研究  

Numerical Simulation Study of Inverted Arch Disaster-causing Conditions in Qiangfengling Tunnel

作　　者：张晓景 李晓雷 ZHANG Xiaojing;LI Xiaolei(Shanxi Transportation Survey&Design Institute Co.,Ltd.,Taiyuan,Shanxi 030032,China;China Water Resources Beifang Investigation,Design and Research Co.,Ltd.,Tianjin 300131,China)

机构地区：[1]山西省交通规划勘察设计院有限公司,山西太原030032 [2]中水北方勘测设计研究有限责任公司,天津300131

出　　处：《山西交通科技》2024年第5期123-127,共5页Shanxi Science & Technology of Transportation

摘　　要：隧道长期运营情况下,由于自身地质条件及日常养护不足等经常导致出现多种病害问题。国家高速公路网荣成至乌海高速公路抢风岭隧道ZK77+265—ZK77+313至K77+213—K77+357段,其地基层以泥岩为主,由于泥岩具有较强的亲水性,隧道在部分仰拱区域产生冻胀、融沉和吸水膨胀3方面病害。基于离散元软件MatDEM对其进行建模,并模拟隧道冻胀融沉和吸水变形的过程。根据试验所得的体变率-吸水率关系,以颗粒粒径增大/缩小的方式来改变颗粒体积,进而完成吸水膨胀、岩体冻胀和融沉过程的模拟。结果表明当地下水位处于4 m以上位置时都能促使隧道破坏,而只有地下水位低于4 m时,对隧道结构的影响较小。Under long-term operation,various diseases occur in tunnels due to geological conditions and insufficient maintenance.For the section from ZK77+265—ZK77+313 to K77+213—K77+357 of Qiangfengling Tunnel in Rongcheng–Wuhai Expressway of National Expressway Network,the foundation is mainly mudstone which has strong hydrophilicity,so three types of diseases,frost heave,thawing settlement,and water absorption and expansion,are generated in part of the inverted arch zone.This paper used the discrete element software MatDEM to establish the tunnel's model and simulate the frost heave,thawing settlement,and water absorption deformation.According to the relation between the volumetric rate and water-absorption rate obtained from the test,the particle volume was changed by increasing/decreasing in particle size,so as to simulate the process of the water absorption and expansion,frost heave,and thawing settlement of the rock.The results showed that the tunnel would be damaged when the groundwater level was above 4 m,while the groundwater level was below 4 m,it had less impact on the tunnel's structure.

关 键 词：抢风岭隧道 冻胀 融沉 吸水膨胀 MatDEM模拟 

分 类 号：U457[建筑科学—桥梁与隧道工程]