下伏溶洞扩展对路基稳定性的影响数值分析  

Numerical Analysis of the Impact of Underlying Karst Cave Expansion on Roadbed Stability

作　　者：孔世调 刘泽[2] 何瑾 汤中华 史克友 Kong Shitiao;Liu Ze;He Jin;Tang Zhonghua;Shi Keyou(Zhejiang Jiaogong International Engineering Co.,Ltd.,Hangzhou 310051,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;School of Civil Engineering,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]浙江交工国际工程有限公司,浙江杭州310051 [2]湖南科技大学土木工程学院,湖南湘潭411201 [3]河南工业大学土木工程学院,河南郑州450001

出　　处：《市政技术》2024年第7期109-115,123,共8页Journal of Municipal Technology

基　　金：湖南省自然科学基金项目(2022JJ20357);郑州市研究与试验发展(R&D)项目(31310122);浙江省建筑业技术创新协会科研项目(2021B49)。

摘　　要：路基中的溶洞具有隐蔽性和发育性,是道路交通安全的重要隐患。为探讨溶洞扩展对岩溶路基稳定性的影响,以FLAC3D建立含溶洞的路基数值模型,分析了溶洞向上扩展、向下扩展、向两侧扩展和向四周扩展4种工况下岩溶路基的稳定性。研究结果表明:随着路基中溶洞的发育扩展,路基的竖向变形会增大、稳定性会降低;当路基中溶洞向上扩展时,新增变形主要出现在溶洞上方,会造成路基的稳定性迅速下降;溶洞向两侧扩展对岩溶路基的稳定性也有不利影响,但与溶洞向上扩展相比,这种影响相对较小;在4种工况下,溶洞向四周扩展对岩溶路基的稳定性影响最大,然后依次是向上扩展和向两侧扩展,而溶洞向下扩展时会引起溶洞底板和两边竖向变形增大,但对岩溶路基的稳定性影响很小。That concealment and developmental characteristics of the karst caves in the roadbed have are important hidden dangers for road traffic safety.In order to explore the impact of karst cave expansion on the stability of karst roadbeds,a numerical model of roadbeds containing karst cave is established by FLAC3D to analyze the stability of karst roadbeds under four working conditions of karst cave expand upwards,downwards,to both sides,in all directions.Research shown that the vertical deformation will increase and stability of the roadbed will decrease with the development and expansion of karst caves in the roadbed;When the karst cave expands upwards,the newly added deformation mainly occurs above the karst cave,which will cause a rapid decrease in the stability of the roadbed;When the karst cave expands to both sides,it has also adverse impacts.But compared with the expansion upwards of the karst cave,the impact is relatively smaller;Under four working conditions,the expansion in all directions has the greatest impact on the stability of the karst roadbed,followed by upward expansion and bilateral expansion.When the karst cave extends downwards,it causes an increase in deformation of the bottom plate and two sides of the karst cave,but has little impact on the stability of the karst roadbed.

关 键 词：岩溶路基 数值模拟 溶洞扩展 稳定性 

分 类 号：U416.1[交通运输工程—道路与铁道工程]