西安科技大学学报2023，Vol.43Issue(6)：1149-1157,9.DOI:10.13800/j.cnki.xakjdxxb.2023.0613
软土地区钢顶管施工引起的地表变形规律
Ground deformation law of steel pipe jacking construction in soft soils
摘要
Abstract
In order to study the ground deformation law caused by steel pipe jacking construction in soft soil area,prediction formula,a water conveyance project in Dongguan was taken as the background,and numerical simulation and field monitoring methods were adopted to calculate and monitor the ground deformation caused by the jacking process,so as to obtain the vertical and horizontal ground deforma-tion law during the jacking process.Firstly,the ground deformation prediction formula was deduced to consider the jacking clearance,and then the maximum vertical displacement 14.1 mm generated by pipe jacking construction was calculated.This deformation is within the allowable range of road settle-ment specification(≤20.0 mm),and there is no need to take measures such as soil reinforcement.Secondly,the finite element model was established by numerical simulation to calculate the ground de-formation caused by the jacking,and the method to reduce the ground deformation was discussed.Last-ly,the results from the above three methods were compared with those of field monitoring.The final re-sults show that the shape of deformation curves obtained by the three methods is basically the same,ex-cept that the ground peak displacement at the pipe jacking axis(13.7 mm in numerical simulation and 15.2 mm in field monitoring)is slightly different.When the pipe jacking is carried out,the sedimenta-tion tank of the transverse monitoring section is V-shaped,and the maximum settlement value is at the central axis of the pipe jacking.As the distance from the central axis increases,the settlement value de-creases and eventually approaches 0.The longitudinal monitoring section shows an inverted"S"shape,which can be roughly divided into four stages:uplift of soil before jacking,settlement of soil in jacking,slight uplift of soil after jacking and stability of soil after jacking.Before pipe jacking construction,how to get the ground deformation is very necessary.Combined with the results of prediction and simulation,the soil deformation is controlled by setting the top thrust,grouting pressure and necessary soil rein-forcement.The prediction formula presented in this paper has the characteristics of clear concept and strong operability,has good applicability in soft soil areas and can be used in similar projects in the fu-ture.The research results in this paper can provide scientific reference for ground settlement prediction and deformation control induced by similar pipe jacking projects in soft soil areas.关键词
钢顶管/地表变形/预测公式/数值模拟/现场监测/顶进间隙Key words
steel pipe jacking construction/ground deformation/prediction formula/numerical simula-tion/field monitoring/jacking clearance分类
建筑与水利引用本文复制引用
李江..软土地区钢顶管施工引起的地表变形规律[J].西安科技大学学报,2023,43(6):1149-1157,9.基金项目
中铁十九局集团有限公司科技研究开发计划项目(21-Z03) （21-Z03）
