摘要
以某高速公路下伏采空区工程为依托,利用离散元数值方法(PFC2D),对典型工况下采空区上覆地层的变形规律和传力机制,以及地层变形对地表路基稳定性的影响进行研究。研究结果表明:当采空区埋深较浅时,采空区周围颗粒坍落而填充采空区,并逐步压密楔紧,平衡后地层应力分布与原状地层相似,变形区延伸至地表路基坡顶附近;当采空区埋深较大时,采空区周围岩体力链呈现拱形分布,拱内颗粒位移显著、排列松散,拱外颗粒位移较小、排列密实;当采空区埋深较浅或截面尺寸较大时,地表路基的稳定性因地层变形而显著降低。
Based on the underground goaf project of a certain highway,the discrete element numerical method(PFC2D)is used to study the deformation law and force transmission mechanism of the overlying strata in the goaf under typical working conditions,as well as the influence of strata deformation on the stability of the surface roadbed.The research results show that when the burial depth of the goaf is shallow,the particles around the goaf collapse and fill the goaf,gradually compacting and wedging.After equilibrium,the stress distribution of the formation is similar to that of the original formation,and the deformation zone extends to the top of the surface roadbed slope;When the burial depth of the goaf is large,the rock mass chain around the goaf presents an arched distribution,with significant displacement and loose arrangement of particles inside the arch,and smaller displacement and dense arrangement of particles outside the arch;When the depth of the goaf is shallow or the cross-sectional size is large,the stability of the surface roadbed is significantly reduced due to geological deformation.
作者
张思峰
任士朴
杨修晗
夏冲
ZHANG Si-feng;REN Shi-pu;YANG Xiu-han;XIA Chong(Faculty of Transportation Engineering,Shandong Jianzhu University,250101,Ji'nan,China;Shandong Huajian Engineering Testing Co.,Ltd.,250101,Ji'nan,China;Shandong Hi-speed Transportation Construction Group Co.,Ltd.,250014,Ji'nan,China)
出处
《建筑技术》
2025年第22期2801-2807,共7页
Architecture Technology
