边坡偏压对于邻近地铁车站基坑稳定性影响分析  

Analysis on the stability of metro foundation pit under bias pressure from the adjacent slope

作　　者：李浩 刘毅[2] 彭振 唐晓杰 李元海 LI Hao;LIU Yi;PENG Zhen;TANG Xiaojie;LI Yuanhai(China Communications Construction Company (Guangzhou) Ltd., Guangzhou 511458 China;Technology Center, CCCC Second Harbor Engineering Company Ltd., Wuhan 430040 China;School of Mechanics and Civil Engineering, China University of Mining and Technology, Jiangsu Xuzhou 221116, China;State Key Laboratory for Geomechanics& Deep Underground Engineering, Jiangsu Xuzhou 221116 China)

机构地区：[1]中交(广州)建设有限公司,广东广州511458 [2]中交第二航务工程局有限公司技术中心,湖北武汉430040 [3]中国矿业大学力学与土木工程学院,江苏徐州221116 [4]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116

出　　处：《西安建筑科技大学学报（自然科学版）》2020年第3期359-365,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(51174197)。

摘　　要：随着城市地铁线路穿越山地环境的日益增多,邻近边坡作为一种不利于施工的边界条件变得越发难以避免.边坡偏压影响下地铁车站基坑稳定性分析对于支护参数的选取与工程安全的控制具有重要意义.本文依托深圳轨道交通2号线莲塘口岸站工程,通过建立FLAC二维模型对不同偏压条件下的地表沉降、围护桩变形及剪应力变化规律进行分析.结果表明:地表沉降范围及最大沉降值均随边坡高度的增加而增大,偏压变化对于远坡桩的变形影响较小,但对于近坡桩的影响尤为明显.为定量分析偏压影响下地表及围护桩的变形规律,对结果进行了数据拟合并获得了地表最大沉降值、围护桩桩顶变形、围护桩最大变形及剪应力与边坡高度的关系公式.此外,分析表明随边坡高度的增加,基坑围护墙体的最大剪应力分布于基坑底部,此种情况在工程中需给予重点关注.As more and more urban metro lines are designed to run through the mountainous environment,the situation of foundation pit set adjacent to the slope becomes more difficult to be avoided,which is an unfavorable boundary condition for construction.Ground settlement,pile deformation,and shear stress distribution under different bias pressure were analyzed in this paper based on 2D FLAC model.Simulated background and analysis parameters were set based on the practical project of Lian-Tang-Kou-An metro station of No.2 rail line in Shenzhen.Results show that the surface settlement scope and maximum settlement value increase as slope height,and the bias condition has lesser effect on the deformation of the far-slope pile than that of the near slope.In order to quantitatively analyze the deformation law under the influence of bias pressure,the data of simulation results were fitted to obtain the formula relationship between the slope height and the other parameters in terms of the maximum settlement value,the pile-top deformation,the maximum pile deformation and the shear stress.Moreover,the results show that with the increase of slope height,the maximum shear stress around the foundation wall is normally distributed at the bottom of the pit,which needs to be paid attention in practical engineering.

关 键 词：车站基坑 邻近边坡 稳定性 数值模拟 

分 类 号：TU231[建筑科学—建筑设计及理论]