深大基坑边坡绿色装配式面层防护结构受力与变形分析
钟立超1蒙强1,2罗贤民1徐前卫2韩宇峰2蒋承志2谢金利2
Stress and Deformation Analysis of Green Prefabricated Slope Surface Protection Structure for Deep and Large Foundation Pit
ZHONG Lichao1MENG Qiang1,2LUO Xianmin1XU Qianwei2HAN Yufeng2JIANG Chengzhi2XIE Jinli2
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作者信息:1.广西南宁机场综合交通枢纽建设有限公司，530048，南宁
2.同济大学交通运输工程学院，201804，上海
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Affiliation:1.Guangxi Nanning Airport Comprehensive Transportation Hub Construction Co., Ltd., 530048, Nanning, China
2.College of Transportation Engineering, Tongji University, 201804, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.08.036
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中图分类号/CLCN:U213.1+3
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栏目/Col:研究报告
摘要:
［目的］深大基坑开挖活动会破坏土体原始应力场的平衡状态而产生变形，采用GRF(绿色装配式)面层防护结构能在绿色环保、高效施工的前提下控制基坑变形，因此需对深大基坑边坡GRF面层防护结构的受力与变形性能进行深入研究。［方法］以南宁国际空港综合交通枢纽深大基坑工程为依托，采用有限元数值模拟与现场实测相结合的方法，研究基坑边坡顶部GRF面层防护结构，以及基坑内部桩间GRF面层防护结构的受力与变形规律。［结果及结论］随着基坑开挖深度的增大，基坑边坡顶部的最大水平位移出现位置逐渐向坡脚方向移动，最大水平位移为8.67mm；采用GRF面层防护结构能有效提高基坑顶部边坡的稳定性，锚杆能将GRF面层所受的部分荷载传递至土层中，进而减小GRF面层的变形与受力；桩间距对土拱效应发挥的影响较大，本工程桩间距可提高至2.5m左右，桩间土拱效应在桩顶下方7~8m处最为明显。
Abstracts:
［Objective］ Excavation of deep and big foundation pit destroys the equilibrium state of the original stress field in the soil, leading to ground deformation. Foundation pit deformation can be controlled by adopting GRF (green prefabricated ) surface protection structure with the premises of green environmental protection and high construction efficiency. An in-depth research on stress performance and deformation properties of GRF surface protection structure for deep and large foundation pit is required. ［Method］ Relying on the deep and large foundation pit project of Nanning International Airport Comprehensive Transportation Hub, a combination of finite element numerical simulation and on-site measurements is employed to study the stress and deformation law of the GRF surface protection structure for foundation pit top slope and the GRF surface protection structure between retaining piles in foundation pit. ［Result & Conclusion］ With the increase in foundation pit excavation depth, the location of the maximum lateral displacement of foundation pit top slope gradually shifts towards slope toe, with a maximum lateral displacement of 8.67 mm. The use of GRF surface protection structure effectively enhances the stability of foundation pit top slope. Anchor rods help transfer part of the load borne by GRE surface layer to the soil layer, thereby reducing deformation and stress GRF surface layer. The spacing between retaining piles has a great influence on soil arching effect. In this project, retaining pile spacing can be increased to around 2.5 m, and soil arching effect is most obvious at 7-8 meters below the pile top.
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