摘要
在黏土地区进行竖井施工通常会引起周边土体变形。通过引入弹性半空间体中小球收缩理论,提出了一种圆形竖井施工引起的坑外土体位移预测方法。通过与既有工程监测结果对比,验证了所提计算方法的合理性,随后系统分析了不同工况下圆形竖井引起的地表和深层土体位移场规律。结果表明,竖井周边的地表沉降槽为拱肩型,并随深度增加变为凹槽型曲线;地表水平位移曲线为打勾型,并随深度递增而逐渐转为拱肩型;靠近井壁的深层土体变形规律较为复杂,土体沉降沿深度先增加后急剧减少,水平变形趋势为两头小、中间大的弓形;随着与井壁距离增加,土体变形随深度增加而线性减少;竖井周边的土体水平位移场影响范围比土体沉降影响广泛,工程中容易忽略的深层土体水平位移可能会对邻近立交桥基础和市政管线产生影响。
Shaft construction in clayey soils typically induces ground movements.This study develops a cavity contraction theory-based analytical framework to predict three-dimensional ground displacements during shaft excavation.The validity of the proposed method was first verified through comparative analysis with published monitoring results.Subsequent parametric analyses systematically quantified depth-dependent variations in surface and subsurface soil deformations induced by circular shaft construction.Surface settlements outside the shaft exhibit a spandrel-shaped profile.This configuration gradually transitions to a concave morphology with increasing depth.Horizontal displacement curves demonstrate an evolutionary pattern:initial hump-shaped distributions progressively develop into arched configurations with depth.Deep soil deformations adjacent to retaining walls exhibit complex patterns,characterized by initial settlement accumulation followed by abrupt stress-release-induced reduction.Horizontal deformation profiles adopt distinctive bow-shaped configurations,featuring maximum magnitudes at mid-depth positions.Soil displacement magnitudes demonstrate linear attenuation with both increasing depth and horizontal distance from the excavation.The spatial influence zone of horizontal displacements extends significantly beyond the vertical extent of surface settlements.Monitoring data emphasize that frequently neglected deep-seated horizontal displacements could potentially affect adjacent infrastructure elements,particularly bridge abutments and subsurface utilities.
作者
郑晨
白强强
黄克起
刘晓敏
张强
何晓佩
宋立伟
ZHENG Chen;BAI Qiang-qiang;HUANG Ke-qi;LIU Xiao-min;ZHANG Qiang;HE Xiao-pei;SONG Li-wei(Technology Center,China Construction Sixth Engineering Bureau Co.,Ltd.,Tianjin 300171,China;China Construction Sixth Engineering Bureau Co.,Ltd.,Tianjin 300171,China)
出处
《岩土力学》
北大核心
2025年第S1期335-342,共8页
Rock and Soil Mechanics
基金
中建股份科技研发课题(No.CSCEC-2020-Z46,No.CSCEC6B-2023-Z-12)
关键词
圆形竖井
小球收缩理论
地层损失
土体位移
circular shaft
spherical cavity contraction theory
volume loss
soil displacement
