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超大直径双圆顶管施工对地下管线沉降变形的影响
Influence of Super-Large-Diameter Double-Circular Pipe Jacking Construction on Settlement Deformation of Underground Pipelines
为了探究超大直径双圆顶管施工对地下管线沉降变形的影响,以深圳市铁岗-石岩水库水质保障工程为依托,基于修正Peck公式,采用数值模拟和现场监测结合的方法,通过改变管线埋深、材质、管径、顶管净间距及管线空间位置,采用变量归一化方法分析各因素对管线影响程度,并评价其安全性能。结果表明:顶管选择垂直下穿较为合理,改变管线埋深、材质、管径参数时,位移场最终均呈现“V”形,当两顶管净间距增大至1.5倍顶管管径时,位移场开始呈现“W”形,管线变形范围增大。经过敏感度分析,对管线沉降变形影响最大的是两顶管净间距,最小的是管线管径,敏感度分别为0.54、0.06。通过转角允许值对污水管线安全性能进行评价,根据现场监测值计算得到污水管线接头转角0.54°,在控制标准范围内,保证双圆顶管施工过程中管线不会因不均匀沉降而被破坏。研究成果可为类似大直径顶管下穿管线工程提供参考。
[Objective] This study aims to investigate the influence of super-large-diameter double-circular pipe jacking construction on the settlement deformation of underground pipelines. Taking the water quality assurance project of Tiegang-Shiyan Reservoir in Shenzhen as the background, and based on the modified Peck formula, this study uses a combination of numerical simulation and field monitoring to systematically analyze the effects of multiple factors such as pipeline burial depth, material, pipe diameter, pipe jacking spacing, and spatial position. [Methods] The variable normalization method was used to analyze the influence degree of each factor on the pipeline, and the safety performance of the pipeline was evaluated. [Results] When the jacking pipes vertically crossed under the pipeline, the induced settlement range was the smallest, indicating a relatively reasonable construction method. When the pipeline burial depth, material, or pipe diameter was changed, the stratum displacement field ultimately showed a “V”-shaped distribution. However, when the spacing between the two jacking pipes increased to 1.5 times the jacking pipe diameter (i.e., 6 m), the displacement field shape transformed into a “W”-shaped pattern, and the influence range of pipeline deformation significantly expanded. Sensitivity analysis showed that the spacing between the two jacking pipes was the most significant factor affecting pipeline settlement (sensitivity=0.54), while pipeline diameter had the least influence (sensitivity=0.06), and pipeline burial depth had a moderate influence (sensitivity=0.40). Furthermore, the safety state of the sewage pipeline was evaluated using the allowable joint rotation angle. The calculated joint rotation angle under field monitoring conditions was 0.54°, which was lower than the standard control value of 1.15°, indicating that the pipeline joints remained in a safe state during construction and did not suffer damage due to uneven settlement. [Conclusion] Currently, there is considerable research on settlement deformation of underground pipelines caused by single-line pipe jacking construction, but research on the influence of super-large-diameter double-line pipe jacking with shallow burial depth is limited. This study clarifies the influencing mechanisms of key construction parameters, providing theoretical basis and data support for engineering practices involving large-diameter pipe jacking undercrossing existing pipelines.
超大直径双圆顶管 / 下穿管线 / 沉降变形 / 敏感度分析 / 现场监测
super-large-diameter double-circular pipe jacking / undercrossing pipeline / settlement deformation / sensitivity analysis / field monitoring
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The bearing capacity and dynamic characteristics of railway subgrade are bound to change in the presence of large-diameter pipe jacking passing underneath. The increment of vertical dynamic displacement above the pipe jacking should be within 5 mm, according to railway administrations. The process of train passing on the pipe jacking is numerically simulated. The instantaneous vertical displacement of subgrade and the additional dynamic stress of pipes are given. Newmark dynamic analysis method in association with Seed's equivalent linear method is employed to simulate the vibrational softening of subgrade. The simulation scenario is designed as a pipe jacking group composing six pipes of 4.7 m diameter passing underneath the Beijing-Shanghai railway, with the velocity of train reaching 100 km/h and 200 km/h respectively. When the pipes are buried at a depth of 12 m, the maximum vertical dynamic displacement of subgrade is 1.3 mm, and the additional tensile/compressive stress of pipes are around 0.14 MPa, within in allowable range.
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The ground subsidence caused by rectangular soil pressure balanced pipe jacking construction in large section would damage the pavement structure layer, which has always been a difficulty and hot topic in geotechnical engineering. With the underground passage project in the Inner Mongolia University of Science and Technology as a case study, we analyzed the measured data of subgrade deformation and the applicability of Peck’s formula in predicting ground subsidence caused by rectangular pipe jacking, and also simulated the influence of pipe jacking construction in the presence of different soil depths on ground subsidence numerically. We found that, in general, measuring points in longitudinal direction on the jacking axis bulged at first, and then subsided and subsequently tended to be stable; in terms of cross section, pipe jacking affected an area within 10 meters of the axis, where the volume of settling trough occupied 90% of the total volume. When soil strata loss rate equals 0.4% and width parameter K of settling trough equals 0.4, the measured value agrees well with the results predicted by Peck’s formula. With the increase of overburden soil depth, the surface subsidence decreased gradually, and the settlement range gradually increased. The research results provide theoretical reference and application value for the construction of large cross-section soil pressure balanced rectangular pipe jacking and similar projects.
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