摘要
在城市中进行深基坑开挖,其稳定性至关重要。为研究砂卵石地层深基坑开挖过程中桩锚支护结构的稳定性问题,采用FLAC3D对其进行了三维模型计算分析,分析了不同开挖阶段桩锚支护体系的变形特性,以及基坑土体位移的变化情况,并与实测结果进行比较,研究了土体压力、桩体内力、锚索拉力与桩体水平位移的关系。结果表明:砂卵石地层在一定深度处存在"自立拱"效应,同时,可以对锚索进行有效的锚固,从而对桩体内力、变形起到有效的控制作用,保证基坑的稳定性。数值分析与实测结果相吻合,说明数值计算模型合理,结果可靠。
The stability and safety of deep excavations are important to urban construction.The software FLAC3D was used to assess the stability of pile-anchor supporting structure in deep excavation in sandy cobble ground.The deformation properties of pile-anchor supporting system and soil displacement of deep foundation pit during different stages were estimated numerically.Compared with in-situ monitoring data,the relationship between earth pressure,inner force of pile,tensile force of anchor cable and horizontal displacement of pile system were obtained.The results revealed that arch effect exists in certain depth in sandy cobble ground.And the sandy cobble ground is advantageous to anchored force.So they are useful to decrease the inner force and deformation of the pile system and ensure the stability of deep foundation pit.The results from field tests accorded with numerical simulations,and it showed that computational modeling was reasonable and the results were reliable.
出处
《中国安全生产科学技术》
CAS
北大核心
2011年第1期19-24,共6页
Journal of Safety Science and Technology
基金
国家自然科学基金(编号:50674095
50974126)
中央高校基本科研业务费专项资金(编号:2009QL02)
教育部科学技术研究重点项目(编号:109034)
教育部新世纪优秀人才支持计划(编号:NCET-08-0835)
北京市优秀人才资助项目(编号:20071D1600700414)
关键词
深基坑
砂卵石地层
桩锚支护结构
现场监测
数值分析
deep foundation pit
sandy cobble ground
pile-anchor supporting structure
field monitoring
numerical analysis
