钻孔灌注桩施工对地层及既有管沟振动影响规律研究
聂鹏
Study on the Vibration Influence Law of Bored Cast-in-place Pile Construction on Existing Strata and Pipe Trenches
NIE Peng
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作者信息:中铁十八局集团第三工程有限公司，474250，南阳
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Affiliation:The 3rd Engineering Co., Ltd., of China Railway 12th Bureau Group, 474250, Nanyang, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.01.019
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中图分类号/CLCN:U231.3
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栏目/Col:研究报告
摘要:
［目的］钻孔灌注桩旋挖成孔过程中会对地下既有建构筑物造成振动影响，因此需对旋挖成孔过程中引起的地层和建构筑物振动响应进行研究。［方法］以济南地铁4号线的车站基坑开挖工程为背景，通过现场测试及基于三维有限元模型的数值模拟方法，针对振源距离、埋深、开挖深度、电力管沟不同位置、同时施工桩数等因素对旋挖施工引起的土层和电力管沟振动影响规律进行了分析。［结果及结论］距离振源越近处的土体和既有管沟受到的振动影响越大，距离振源超过6m之后的土体和既有管沟受到的振动影响可忽略；随着埋深的增加，土体受到的振动影响呈现减小趋势；开挖深度至12m后，对浅层埋深管沟的振动影响可忽略不计；测点与振源处于同一深度时，测点处振动影响最大；随着同时施工的两桩净距减小，振动速度峰值呈现升高趋势，当同时施工的两桩净距10m时可忽略振动耦合效应。
Abstracts:
［Objective］ The rotary drilling process of bored cast-in-place piles will cause vibration to the existing underground buildings and structures. Therefore, it is necessary to study the vibration response of the strata and structures caused by the rotary drilling process. ［Method］ Taking a station foundation pit excavation project of Jinan Metro Line 4 as the background, through field tests and numerical simulation methods based on three-dimensional finite element models, the influence of soil layers and power pipe trenches vibration caused by rotary drilling construction is analyzed considering factors such as vibration source distance, burial depth, excavation depth, different power pipe trench positions, and the number of piles under simultaneous construction. ［Result & Conclusion］ The closer the soil and existing power pipe trench are to the vibration source, the greater the vibration effect they receive. The vibration effect on the soil and existing power pipe trenches can be ignored when the distance from the vibration source exceeds 6 m. The vibration effect on the soil shows a decreasing trend with the increase of burial depth. After the excavation depth reaches 12 m, the vibration impact on the shallow buried power pipe trench can be ignored. When the measuring point and the vibration source are at the same depth, the vibration impact at the measuring point is the greatest. With the decrease of the clearance between the two simultaneously-constructed piles, the vibration velocity peak value shows an increasing trend. When the net distance between two simultaneously-constructed piles is 10 m, the vibration coupling effect can be ignored.
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