摘要
我国西南地区是典型的喀斯特地貌,具有地势起伏大、地形复杂的区域特点。受到山区地形条件限制,民航运输优势逐渐显现。重庆武隆民用机场建设中,跑道南端为高填方区域,为保持高填方体稳定,在民航建设中首次采用重力式拦挡坝支护,为探讨其稳定性,采用三维数值模拟模型,探讨了不同施工方案下填筑体及坝体的位移发展规律,优化施工方案。结果表明:填筑体位移分布受基岩面倾斜度、底层填料支撑情况和填筑方量3个因素控制,通过改善基岩面性状、增加填筑层数、控制填筑方量、保证底部填筑面角度等工程措施,可有效控制填筑体变形。采用中下层临时填筑面水平的三层填筑方案,边坡稳定性效果最佳,具有工程可操作性。
The southwest region of China is a typical karst landform with the regional characteristics of complex undulating terrain and hypsographic feature.Restricted by mountainous terrain conditions,the advantages of civil aviation transport gradually appear.The southern valley project of the constructing Wulong civil airport in Chongqing was a typical high fill project on karst foundation.The gravity dam was adopted to support the filling.By establishing FLAC3D triaxial numerical models of six different filling schemes,the displacement development laws of the filler and the dam were discussed,and finally,the optimal scheme was selected.It can be obtained that the displacement distribution of filler is controlled by three factors:the inclination of bedrock surface,the supporting of bottom filler and the quantity of filler.By improving the characteristics of bedrock surface,increasing the number of filler layers,controlling the filler volume and ensuring the horizontal state of bottom filler.,the deformation of filler can be effectively controlled and the strength of dam can be improved.The three-layer filling scheme with the horizontally middle and lower fillers makes the stability of the slope the best.This method can be widely used in engineering practice.
作者
徐浩
黄林
来云亮
Xu Hao;Huang Lin;Lai Yunliang(Project Headquarters of Wulong Airport,Wulong District,Chongqing 408500,China;China Airport Construction Group Co.,Ltd,Southwest Branch,Chengdu 610200,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)
出处
《山西建筑》
2020年第23期72-75,175,共5页
Shanxi Architecture
