scholarly journals The Numerical Analysis of Tunnel Traversing Piles and Its Seismic Response in Deep Soft Soil

2022 ◽  
Vol 2148 (1) ◽  
pp. 012030
Author(s):  
Xiaomin Liu ◽  
Liwei Song ◽  
Songbao Cai ◽  
Xin Zhao ◽  
Peng Xie
Keyword(s):  
Numerical Analysis ◽  
Numerical Model ◽  
Seismic Response ◽  
Soft Soil ◽  
Large Diameter ◽  
River Estuary ◽  
Negative Influence ◽  
Diameter Pipe ◽  
Pipe Jacking ◽  
Deep Soft Soil

Abstract The Ou River estuary deposits deep soft silt and silt clay, the pipe-jacking tunnel departures from Qidu island, then passes underneath north levee road, viewing platform, Ou River and Ou River road, finally reaches the received well. The net distance between tunnel segment and the viewing platform piles is only 230mm. In order to analyze the negative influence of large diameter pipe-jacking tunnel traversing piles of viewing platform, the numerical model is established, and the levee road settlement value is found which matches with observed settlement very well. The dynamic analysis is also conducted by EI Centro seismic wave, and the result reveals that the max displacement occurs on the segment between the rear row piles of viewing platform, and the max displacement reaches 68.6mm in the earthquake.

Experimental Study of the Rotary Filling Piles with Large-Diameter under the Axial Load

2012 ◽  
Vol 594-597 ◽  
pp. 527-531
Author(s):  
Wan Qing Zhou ◽  
Shun Pei Ouyang
Keyword(s):  
Experimental Study ◽  
Axial Load ◽  
Load Transfer ◽  
Soft Soil ◽  
Large Diameter ◽  
Shaft Resistance ◽  
Tip Resistance ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Deep Soft Soil

Based on the experimental study of rotary filling piles with large diameter subjected to axial load in deep soft soil, the bearing capacity behavior and load transfer mechanism were discussed. Results show that in deep soft soil foundation, the super–long piles behave as end-bearing frictional piles. The exertion of the shaft resistance is not synchronized. The upper layer of soil is exerted prior to the lower part of soil. Meanwhile, the exertion of shaft resistance is prior to the tip resistance. For the different soil and the different depth of the same layer of soil, shaft resistance is different.

Seismic response of subway station in soft soil: Shaking table testing versus numerical analysis

2020 ◽  
Vol 100 ◽  
pp. 103389 ◽  
Author(s):  
Weifeng Wu ◽  
Shiping Ge ◽  
Yong Yuan ◽  
Wenqi Ding ◽  
Ioannis Anastasopoulos
Keyword(s):  
Numerical Analysis ◽  
Seismic Response ◽  
Soft Soil ◽  
Shaking Table ◽  
Subway Station ◽  
Shaking Table Testing

The Numerical Analysis and Field Measurements of the Shield Tunnel Passing through the Pipeline Groups

2012 ◽  
Vol 226-228 ◽  
pp. 1488-1494
Author(s):  
Guan Shui Liu ◽  
Lian Wei Sun ◽  
Bo Wang ◽  
Shi Ming Wu ◽  
Cheng Po Hong ◽  
...  
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Numerical Model ◽  
Water Pressure ◽  
Large Diameter ◽  
Field Measurements ◽  
Numerical Results ◽  
Shield Tunnel ◽  
Sewer Pipes

In this work, research was carried out based on the shield tunnel of metro line 1 in Hangzhou. The construction of this tunnel beneath the sewage pipelines, which have large diameter with water pressure. The project studied in this treatise is relatively rare in China in terms of sewer pipes, the number of sewers, spacing between shield and sewers and the crossing times. A numerical model was established to analyze the construction of metro across the sewage pipelines with water pressure, taking the interactions between tunnel, pipelines and soil into account. The stress of pipelines, settlement of pipelines and ground during the crossing process were calculated. The finite element results were compared with measured results to verify the reliability of numerical results. Some meaningful results were achieved.

First application of cast-in-place concrete large-diameter pipe (PCC) pile-reinforced railway foundation: a field study

2016 ◽  
Vol 53 (4) ◽  
pp. 708-716 ◽  
Author(s):  
Mi Zhou ◽  
Hanlong Liu ◽  
Yumin Chen ◽  
Yuxia Hu
Keyword(s):  
High Speed ◽  
Lateral Displacement ◽  
Soft Soil ◽  
Large Diameter ◽  
High Capacity ◽  
Design Guidelines ◽  
Excess Pore Pressure ◽  
Large Diameter Pipe ◽  
Diameter Pipe ◽  
Pcc Pile

Cast-in-place concrete large-diameter pipe (PCC) piles have been widely used in highway construction for foundation reinforcement, where soft ground was encountered, due to their fast on-site construction and high capacity, hence economics. This paper reports the performance of their first application in high-speed railway foundation reinforcement on soft soil ground. To satisfy the strict settlement requirement for railway design, PCC piles with large diameters (D = 1 m), thick pile wall thicknesses (t = 0.15 m), and close spacing (s = 2.5 m) were constructed. The foundation performance has been monitored by measuring in situ foundation settlement, excess pore pressure in soil, lateral displacement of soil, and tension in the geogrid during and after embankment construction. The measurements of this project have been compared with that of a previous project when PCC piles were used. It is found that the PCC pile arrangement in this project has performed as predicted and fulfilled the strict settlement requirement set by the Chinese design guidelines.

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