修正Peck公式在南昌地区富水砂土地层地铁盾构施工中的应用
周诚华1汪顺敏2林晓琼2许开成2陈梦成2张季2
Application of Modified Peck Formula for Metro Shield Tunneling Construction in Water-bearing Sandy Soil Layers in Nanchang
ZHOU Chenghua1WANG Shunmin2LIN Xiaoqiong2XU Kaicheng2CHEN Mengcheng2ZHANG Ji2
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作者信息:1.南昌轨道交通集团有限公司， 330038， 南昌
2.华东交通大学土木建筑学院， 330013， 南昌
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Affiliation:1.Nanchang Rail Transit Group Co., Ltd., 330038, Nanchang, China
2.College of Civil Engineering and Architecture, East China Jiaotong University, 330013,Nanchang, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20245735
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中图分类号/CLCN:U455.43;U231.3
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栏目/Col:土建工程
摘要:
［目的］受地质条件、隧道埋深、隧道直径及上覆土层性质等因素影响，Peck公式在南昌地区富水砂土地层地铁盾构施工实际使用过程中计算结果的误差较大，需要对公式进行修正。［方法］依托南昌地铁3号线某区间盾构施工的现场实测数据及其他实测数据，综合考虑了隧道埋深、隧道半径及上覆土体内摩擦角这3个地面沉降的主要影响因素，得到了适用于南昌地铁富水砂土地层地铁盾构施工的地面沉降槽宽度计算公式。通过Peck公式逆运算，得到了地层损失率的取值范围。引入最大沉降值修正系数，对Peck公式进行了线性回归修正。［结果及结论］基于修正后Peck公式得到的预测地面沉降曲线与实测沉降曲线吻合度良好。该公式能够有效预测因地铁盾构施工引起的地面沉降。
Abstracts:
［Objective］ Due to the influence of geological conditions, tunnel burial depth, tunnel diameter, and properties of the overlying soil layer, the Peck formula exhibits significant deviations when applied to the shield tunneling construction in water-bearing sandy soil layers in Nanchang area. Therefore, a modification of the formula is necessary. ［Method］ Based on the field-measured data from a shield tunneling construction in a interval on Nanchang Metro Line 3, along with other measured data, the tunnel burial depth, tunnel radius, and internal friction angle of the overlying soil 3 primary factors that affect land subsidence are comprehensively considered. A calculation formula for land subsidence trough width applicable to Nanchang Metro shield tunneling in water-bearing sandy soils is derived. The range of formation loss rate is determined through inverse calculation using Peck formula. A correction coefficient for maximum subsidence is introduced to perform linear regression modification of Peck formula. ［Result & Conclusion］ The land subsidence curves predicted by the modified Peck formula closely match the measured subsidence curves, indicating that the formula can effectively predict land subsidence caused by metro shield tunneling construction.
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