硬土地基临近超大规模堆载对基坑变形及稳定性影响研究  

Influence of Adjacent Ultra-Large-Scale Surcharge Loading on the Deformation and Stability of a Foundation Pit in Stiff Soil Foundation

作　　者：陈光 丁文云 陶亮峰 CHEN Guang;DING Wenyun;TAO Liangfeng(China Railway Second Institute Kunming Survey and Design Research Institute Co.,Ltd.,Kunming 650500,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]中铁二院昆明勘察设计研究院有限责任公司,云南昆明650500 [2]华东交通大学土木建筑学院,江西南昌330013

出　　处：《国防交通工程与技术》2025年第2期22-25,16,共5页Traffic Engineering and Technology for National Defence

摘　　要：依托某机场隧道基坑工程,采用三维数值模拟方法分析了硬质黏土地基中临近超大规模堆载对放坡开挖基坑变形及稳定性的影响。通过与现场监测数据对比分析,验证了数值模型的准确性和可靠性。在此基础上,进一步分析了不同堆载间距与荷载量级条件下基坑变形及整体安全系数的变化规律。分析结果表明:在硬质黏土地基中,由于堆载引起的土体侧鼓效应,临近超大规模堆载会导致基坑堆载侧一定范围内地表沉降减少;当堆载距离小于基坑开挖深度的0.75倍时,基坑的整体稳定性显著降低,存在较高的失稳风险;当堆载距离增大至基坑开挖深度的1.25倍以上时,大规模堆载对基坑开挖过程中的变形影响则明显减弱。研究成果为类似临近大规模堆载条件下基坑施工提供参考与借鉴。Based on an airport tunnel foundation pit project,this study investigates the influence of adjacent ultra-large-scale surcharge loading on the deformation and stability of a foundation pit excavated in a stiff clay foundation.A three-dimensional numerical simulation was conducted to analyze the deformation characteristics and overall stability under different surcharge distances and load magnitudes.The numerical model was validated through comparisons with field monitoring data,confirming its accuracy and reliability.The results indicate that in a stiff clay foundation,the lateral bulging effect induced by surcharge loading reduces surface settlement within a certain range on the surcharge side of the pit.When the surcharge distance is less than 0.75 times the excavation depth,the overall stability of the foundation pit significantly decreases,posing a high risk of instability.Conversely,when the surcharge distance exceeds 1.25 times the excavation depth,the impact of large-scale surcharge loading on excavation-induced deformation is notably reduced.These findings provide valuable references for foundation pit construction under similar conditions involving adjacent large-scale surcharge loading.

关 键 词：基坑开挖 临近堆载 变形规律 基坑稳定 硬质地基 

分 类 号：TU753[建筑科学—建筑技术科学]