邻近地下管线的深大基坑的支护方案研究  

STUDY ON SUPPORT SCHEME OF DEEP AND LARGE FOUNDATION PIT ADJACENT TO UNDERGROUND PIPELINE

作　　者：邢亮 Xing Liang

机构地区：[1]北京建材地质工程有限公司,北京100102

出　　处：《建筑技术开发》2022年第19期166-168,共3页Building Technology Development

摘　　要：深、超深基坑工程的大量涌现使得地铁深基坑常穿越城市中心地带而对周围环境的影响逐渐显现。但既有的研究大多局限于基坑本身水平变形和沉降的变化规律,忽略了基坑开挖与其周边建筑结构的相关关系,尤其是缺乏坑周管线在基坑施工过程中受侵扰而变形的问题。以某超高层建筑工程深基坑为例,采用数值模拟FLAC3D建立分析计算模型,以基坑支护结构形式的几何特征为切入点,探讨支护结构的性状变化对其附近管线的影响规律。研究结果表明:地下管线的水平位移和竖向位移随桩间距的增大先增大后减小;随桩间距增大、锚索长度的减小,管线的水平位移减小、竖向位移增大。A large number of deep and ultra deep foundation pit projects make the subway deep foundation pit often pass through the urban center,and the impact on the surrounding environment gradually appears.However,most of the existing studies are limited to the variation law of the horizontal deformation and settlement of the foundation pit itself,ignoring the correlation between the foundation pit excavation and its surrounding building structures,especially the lack of the deformation of the pipeline around the pit in the process of foundation pit construction.Taking the deep foundation pit of a super high-rise building project as an example,this paper establishes a sub analysis and calculation model by using numerical simulation FLAC3D,and discusses the influence law of the behavior change of the support structure on the nearby pipeline based on the geometric characteristics of the form of the foundation pit support structure.The results show that the horizontal displacement and vertical displacement of underground pipeline first increase and then decrease with the increase of pile spacing;With the increase of pile spacing and the decrease of anchor cable length,the horizontal displacement of pipeline decreases and the vertical displacement increases.

关 键 词：深大地基基坑 邻近管线 变形影响 FLAC3D 

分 类 号：TU46.3[建筑科学—结构工程]