摘要
【目的】揭示双级组合式绿色加筋格宾挡墙在施工过程中的结构内力演化规律与整体稳定性,为该类生态支挡结构的施工优化与安全控制提供理论依据。【方法】依托某实际工程布设土压力盒、柔性位移计和全站仪监测点,对各级筋材拉力、水平土压力及面墙位移进行全过程现场监测;同时建立FLAC3D有限差分模型模拟施工过程,以实现监测数据与数值模拟结果的交互验证。【结果】施工荷载使面墙呈“悬臂梁”变形,第一级坡顶、底部位移最小,第一级中1/2高度处最大;第二级水平土压力呈鼓胀型分布,峰值向外侧偏移,通过面墙外鼓实现主动卸荷;各层筋材拉力沿长度方向因网兜效应先增后减,峰值位于筋材中部偏墙面,模拟值与实测值误差<8%,一致性良好。【结论】双级组合式绿色加筋格宾挡墙通过筋-土协同柔性变形可自适应卸除施工荷载,其整体稳定性由筋材网兜效应与面墙鼓胀卸荷机制共同保证。
[Purposes]To elucidate the evolution of internal forces and overall stability of a two-stage composite green reinforced gabion retaining wall during construction,and to provide a theoretical basis for construction optimization and safety control of such eco-friendly retaining structures.[Methods]Based on an actual project,earth-pressure cells,flexible displacement meters,and total-station monitor-ing points were installed to continuously measure reinforcement tensile forces,horizontal earth pres-sures,and facing displacements throughout the construction sequence.Simultaneously,a 3D finite-difference model(FLAC3D)was established to simulate the staged construction process;the numerical re-sults and field data were cross-validated.[Findings]Construction loads induced a cantilever-beam de-formation of the facing:the crest and toe of the first stage exhibited the smallest displacements,whereas the maximum horizontal displacement occurred at mid-height(H/2).Earth pressures in the second stage assumed a bulging distribution with the peak shifting outward;active unloading was achieved through outward bulging of the flexible facing.Tensile forces in all reinforcement layers first increased and then decreased along their length owing to the netting-bag effect,with the maximum located near the mid-length toward the wall face.The discrepancy between simulated and measured values was less than 8%,indicating excellent agreement.[Conclusions]The two-stage green reinforced gabion wall can adap-tively dissipate construction loads through synergistic flexible deformation of the reinforcement and soil;overall stability is jointly ensured by the reinforcement netting-bag effect and the active unloading mechanism of the bulging facing.
作者
龙祖惠
高文慧
何彬
陈烽
李赞
LONG Zuhui;GAO Wenhui;HE Bin;CHEN Feng;LI Zan(Yueyang Planning,Survey and Design Institute Co.,Ltd.,Yueyang 414004,China;School of Civil Engineering,Central South University,Changsha 410075,China)
出处
《河南科技》
2025年第16期64-69,共6页
Henan Science and Technology
基金
湖南省自然科学基金项目(2021JJ30830)。
关键词
组合式加筋挡墙
绿色加筋格宾
现场监测
数值模拟
施工荷载
combined reinforced retaining wall
green reinforced gabion
field tests
numerical simula-tion
construction load
