复杂环境条件下深大基坑二次借力传力支护体系分析与实践  

Analysis and Practice of 2nd Force Borrowing&Transmission Support System in Deep Foundation Pit Under Complex Environmental Conditions

作　　者：孙军 彭丽云 刘兵科 黄睿嘉 Sun Jun;Peng Liyun;Liu Bingke;Huang Ruijia(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;BCEG Civil Engineering Co.,Ltd.,Beijing 100015,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京建工集团有限责任公司,北京100015

出　　处：《市政技术》2025年第1期111-118,共8页Journal of Municipal Technology

基　　金：国家自然科学基金项目(42172299)。

摘　　要：以北京某改造复建项目深大基坑工程为例,针对其周边存在障碍物影响支护的问题,提出不支护、半支护和全支护3种方案;通过Midas GTS/NX软件从变形和受力的角度对上述方案进行了分析,比选得到了最优方案,并将其应用于实际工程;同时对该方案提出的由斜拉锚索配合水平对拉锚杆形成的二次借力传力支护体系进行了重点分析。数值模拟研究发现,当不支护或半支护时,基坑将出现失稳现象;而全支护时,竖井北侧供力源斜拉锚索提供的拉力大于基坑侧借力源对拉锚杆稳定基坑所需的拉力,且在该支护体系作用下,基坑围护结构变形可以满足规范要求。此外,现场监测数据研究发现,监测结果与全支护模拟计算结果变化趋势一致且数值接近,文中提出的基于二次借力传力的全支护方案合理有效,建立的数值模型能有效反映工程实际。Taking a deep foundation pit engineering project of a reconstruction project in Beijing as an example,this paper addresses the issue of surrounding obstacles affecting the support system to propose three support schemes of no support,semi-support and full-support.By Midas GTS/NX software,the deformation and stress of these schemes are analyzed to identify the optimal solution,which is then applied to the actual engineering project;The paper also focuses on the analysis of a 2nd force borrowing&transmission support system formed by combining inclined cable anchors and horizontal tension rods.Numerical simulation results show that the foundation pit becomes unstable under no support or semi-support conditions;Under full-support,the tension provided by the inclined cable anchors on the northern side of the shaft is greater than the tension required by the horizontal tension rods to stabilize the pit,and the deformation of the foundation pit enclosure structure meets code requirements under this support system.Moreover,the field monitoring data shows that the monitoring results align with the trend and values of the full-support simulation,confirming the effectiveness and rationality of the full-support scheme based on 2nd force borrowing&transmission.The established numerical model accurately reflects the actual engineering.

关 键 词：深大基坑工程 二次借力传力支护体系 数值模拟 斜拉锚索 对拉锚杆 

分 类 号：TU470[建筑科学—结构工程]