桩锚支护土岩深基坑地表沉降特征分析  

ANALYSIS OF SURFACE SETTLEMENT CHARACTERISTICS OF PILE-ANCHOR SUPPORTING SOIL-ROCK DEEP FOUNDATION PIT

作　　者：赵军 胡聪伟 刘飞 ZHAO Jun;HU Congwei;LIU Fei(China Railway Construction Engineering Group,Beijing 100071,China;Qingdao University of Technology,Shandong Qingdao 266525,China)

机构地区：[1]中铁建工集团有限公司,北京100071 [2]青岛理工大学,山东青岛266525

出　　处：《低温建筑技术》2023年第8期142-145,共4页Low Temperature Architecture Technology

摘　　要：为探讨微型钢管桩和锚索联合支护的土岩复合地层深基坑开挖诱发周边地表的沉降特征,文中以山东大学齐鲁医院深基坑工程为依托,通过数值模拟和现场监测结合的方法展开研究。对比分析基坑开挖过程中的实测数据和模拟数据,验证模型合理性,研究在不同开挖深度时周边的地表沉降规律,得出地表沉降对开挖深度敏感并且在开挖初期变化速率大,变形主要发生在开挖前中期的土层及强风化花岗岩地层当中;在基坑开挖过程中周边地表沉降呈现出不规则的双峰偏态分布,在距离基坑边线6m的位置沉降值最大,最大沉降为6.65mm。研究成果可为类似土岩结合地区深基坑支护设计提供参考。This paper investigates the settlement characteristics of the surrounding ground surface induced by the excavation of the deep foundation pit of soil-rock composite stratum jointly supported by miniature steel pipe pile and anchor cable.Numerical simulation and field monitoring are employed to carry out the research on a deep foundation pit project.The reasonableness of the model is verified and the settlement pattern of the surrounding ground surface at different excavation depths is studied by comparing and analyzing the measured and simulated data during the excavation of the foundation pit.The surface settlement is sensitive to the excavation depth,and the change rate is large at the early stage of excavation;the deformation mainly occurs in the soil layer and the strongly weathered granite stratum in the middle of the pre-excavation period;the surface settlement around the excavation process of the foundation pit shows an irregular bimodal skewed distribution.The maximum settlement value is 6.65mm at 6m from the edge of the foundation pit.

关 键 词：土岩组合地层 深基坑 桩锚支护 地表沉降 

分 类 号：TU433[建筑科学—岩土工程]