The Application of Cast-in-Place Pile in Fanhe Harbor Bridge

2011 ◽  
Vol 368-373 ◽  
pp. 2839-2842 ◽  
Author(s):  
Bin Tang ◽  
Ya Guang Liu ◽  
Xiao Xin Zhang
Keyword(s):  
Pile Foundation ◽  
Sea Water ◽  
Soft Soil ◽  
Soil Layer ◽  
Bridge Engineering ◽  
Engineering Practice ◽  
Key Technology ◽  
Foundation Construction ◽  
Geological Conditions ◽  
Bridge Foundation

Cast-in-place pile with its strong adaptability, cost moderate, construction simple and its high bearing capacity, can penetrate through the soft soil layer, facilitate underwater construction and the settlement is small and other characteristics are widely used in bridge engineering field. But the changeful gulf climate, tidal fluctuations bring a lot of inconvenience to bridge foundation construction, and sea water features affect the durability of the bridge foundation, so cast-in place pile foundation construction are difficult technical at gulf environment. This paper introduces a successful practice about cast-in-place pile engineering in the bay bridge. Combined with the Fanhe Harbor Bridge engineering practice, based on the special hydrological, geological conditions, this paper expounds the gulf cast-in-place pile construction and key technology.

Calculation of Hongdu Bridge Foundation Construction

2011 ◽  
Vol 105-107 ◽  
pp. 1264-1267
Author(s):  
Jin Bo Song
Keyword(s):  
The Other ◽  
Key Technology ◽  
Foundation Construction ◽  
Cable Structure ◽  
Single Column ◽  
Bridge Foundation ◽  
The City ◽  
Double Wall ◽  
Northern Branch

Hongdu Bridge is an extraordinarily huge bride across northern branch Ganjiang River, in the city of Nanchang. Main tower adopted single column slanted pylon space twist face back cable structure. Its construction is based on double-wall cofferdam method. The paper discuss thecalculation of key step and key position for the key technology in terms of double-wall cofferdam and platform underwater construction, Which include the design of the base construction and double-wall cofferdam,steel cofferdam construction, the calculation and checking of the cofferdam and so on. The whole length of 9.5 km, except the starting period of about 2.4 km for roadbed type, the other sections of approximately 7 km. The project always invests about 18 Billion yuan.

Finite Element Analysis of Bridge-Foundation Interaction System under Horizontal Seismic Excitation

2014 ◽  
Vol 490-491 ◽  
pp. 691-694
Author(s):  
Shou Long Chen ◽  
Chun Yi Cui ◽  
Yan Sun
Keyword(s):  
Finite Element ◽  
Seismic Waves ◽  
Soil Depth ◽  
Soft Soil ◽  
Soil Layer ◽  
Element Analysis ◽  
Interaction System ◽  
Frequency Components ◽  
Bridge Foundation ◽  
Pile Length

Based on Newmark-β gradual integration method and elastic-plastic mechanical theory, numeriacl analyses of effects of soft soil depth and thickness and pile length on the characteristics of horizontal seismic response of bridge-foundation interaction system with soft layers conducted by using finite element program Midas/GTS. The numerical results show that: (1) The high frequency components of seismic excitations can be filtered and the low frequency components are amplified correspondingly when seismic waves are transmitted through soft soil layer, and thicker and lower soft soil layer can amplified this effects; (2)The extremum force of abutment shows decreases first then increases with depth decreasing, and displacement of abutment top and bottom has the same law with seismic waves, and the thicker and lower soft soil layer or shorter piles can aggravate abutment force and deformation; (3)Shear extremal stress shows decrease from top to bottom and the thicker and lower soft soil layer or shorter piles are adverse on piles; (4)Moment extremal expresses first increase then decrease with pile length and the lower and thicker soft soil layer or shorter piles can enlarged piles moment.

scholarly journals Study on the influence of seafloor soft soil layer on seismic ground motion

2020 ◽  
Author(s):  
Jingyan Lan ◽  
Juan Liu ◽  
Xing Song
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Sea Water ◽  
Response Spectrum ◽  
Soft Soil ◽  
Free Field ◽  
Soil Layer ◽  
Response Analysis ◽  
Peak Acceleration ◽  
Seismic Response Analysis

Abstract. In the complex medium system of sea area, the overlying sea water and the surface soft soil have a significant impact on the seafloor ground motion, which brings great seismic risk to the safety of offshore engineering structures. In this paper, four sets of typical free field models are constructed and established, which are land model, land model with surface soft soil, sea model and sea model with surface soft soil. The dynamic finite difference method is used to carry out two-dimensional seismic response analysis of typical free field based on the input forms about P and SV wave. By comparing the seismic response analysis results of four groups of calculation models, the effects of overlying seawater and soft soil on peak acceleration and acceleration response spectrum are studied. The results show that when SV wave is input, the peak acceleration and response spectrum of the surface of soft soil on the surface and the seabed surface can be amplified, while the overlying sea water can significantly reduce the ground motion. When P wave is used, the effect of overlying seawater and soft soil on peak acceleration and response spectrum of surface and seabed can be ignored. The peak acceleration decreases first and then increases from the bottom to the surface, and the difference of peak acceleration calculated by four free field models is not obvious. The results show that the overlying sea water and the surface soft soil layer have little effect on the peak acceleration of ground motion below the surface.

Construction Technology Research Expressway Soft Long Pile Lakes

2014 ◽  
Vol 1065-1069 ◽  
pp. 687-690
Author(s):  
Mei Yan He
Keyword(s):  
Pile Foundation ◽  
High Speed ◽  
Soft Clay ◽  
Construction Technology ◽  
Construction Process ◽  
Technology Research ◽  
Technical Problems ◽  
Foundation Construction ◽  
Bored Pile ◽  
Geological Conditions

Currently, bored pile been widely applied in the current road and bridge construction, But its construction technology in complex geological case is still not perfect. In view of this, this paper carried out a high-speed Lakes viaduct extraordinary pile foundation construction project. For the analysis of the technical difficulties in the construction process, explore get the corresponding key construction technology, and it relates to the accident and its approach are summarized, study drew long pile construction technology Lakes geological conditions under soft silt and clay, solve the long holes bored pile into the lake silt soft clay under geological conditions, verticality control and other technical problems, can provide reference for similar projects.

Auger Bored Piles Application Works in the Subway

2014 ◽  
Vol 580-583 ◽  
pp. 1301-1305
Author(s):  
Yang Wu
Keyword(s):  
Pile Foundation ◽  
Foundation Engineering ◽  
Quality Cost ◽  
Foundation Construction ◽  
Wet Process ◽  
Long Duration ◽  
Geological Conditions ◽  
Bored Piles ◽  
Subway Construction ◽  
The Impact

<span><span lang="EN-US">Pile Foundation Construction jobs are usually wet process has contaminated a large, long duration, the pile of inconsistent quality, cost out. And long bored piles to adapt to a variety of complex geological conditions, but not the impact of water table, is widely used in various projects of the foundation engineering, this according to subway construction in Kunming, the application of experience, a brief description length screw pile construction anti-interpolation technology.</span>

scholarly journals The influence of the stratum structure of the pipe pile sliding pile of the offshore platform

2021 ◽  
pp. 6
Author(s):  
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Soft Soil ◽  
Limit State ◽  
Soil Layer ◽  
Measurement Data ◽  
Friction Resistance ◽  
Side Friction ◽  
The Impact ◽  
Bearing Layer

This article has carried on the theoretical analysis to the generation mechanism of the sliding pile phenomenon. A certain prediction was made on the causes of slipping piles and their influencing factors. At the same time, it is based on the collected field measurement data, an engineering example is selected to briefly analyze the changes in the bearing capacity of the pile foundation after the sliding pile occurs. It is found that the influence of the sliding pile on the bearing capacity of the pile foundation is mainly the influence on the side friction resistance of the pile, and the reduction of the soil resistance is also mainly due to the reduction of the side friction resistance of the pile. Finally, using ABAQUS finite element analysis software, a numerical simulation analysis was carried out on the changes of the stratum structure, the analysis results show that the position change of the soft soil layer has a certain influence on the bearing capacity of the pile, but it does not change the settlement of the pile top under the limit state; The greater the strength of the supporting layer, the greater the bearing capacity and the greater the displacement when reaching the limit state; The length of the slipped pile does not affect the bearing capacity of the pile foundation, and the farther the slipping occurs from the bearing layer, the smaller the impact on the bearing capacity of the pile foundation. Therefore, in the actual project, attention should be paid to the selection of the bearing layer and the soft soil layer close to the bearing layer should be removed to reduce the impact of the slipping pile on the bearing capacity of the pile foundation and ensure that the bearing capacity of the pile foundation meets the design requirements.

scholarly journals Study of Construction Techniques of Highways and Bridges on Soft Soil Foundation

2015 ◽  
Vol 2 ◽  
pp. 39
Author(s):  
Hainan Zheng
Keyword(s):  
Soft Soil ◽  
Soil Layer ◽  
Foundation Construction ◽  
Safety Issues ◽  
Construction Techniques ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
The Cost

<p>The quality of highways and bridges’ foundation construction influences the overall quality of the projects directly. The soft soil layer shall be investigated in advance during construction in order to analyse and identify the specific reinforcement and processing approaches. The cost, processed effects and safety issues shall be considered prior to reinforcement. Different reinforcement approaches can be used in order to save the cost and ensure the quality of soft soil foundation reinforcement. This paper discusses the preparation of soft soil foundation construction and the technology involved in the construction of highways and bridges on soft soil foundation. It is expected that the study could provide some references to professionals.  </p>

scholarly journals Experimental and Numerical Investigations on Hydraulic Barrier Bottom Plug for Deep Excavations: A Case Study

2021 ◽  
Vol 10 (4) ◽  
pp. 57-61
Author(s):  
An Phung Vinh
Keyword(s):  
High Reliability ◽  
Soft Soil ◽  
Soil Layer ◽  
Clayey Sand ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Geological Conditions ◽  
Reasonable Proportion ◽  
Hydraulic Barriers

In Vietnam, the solution of designing and constructing deep foundation pits with the geology of sandy or clayey sand is very difficult, especially in case soil mix mud. In some deep foundation pits, the unreasonable treatment solution causes the bottom plug of the foundation pit to be pushed up to the foundation pit or not to pump a foundation pit dried. Solving those problems, this article introduces a particular case study, sealing the bottom of the foundation pit for no 14 of Yen Xa drainage works with the Jet grouted bottom plug hydraulic barriers. To treat the soft soil layer, mix organic without breaking the upper soil layers, this solution uses Jet-grouting technology with a mixture of materials including cement, fly ash, blast furnace slag, lime in a reasonable proportion to ensure waterproof and not uplift the massive bottom plug hydraulic barriers when excavating soil in the pit. Results of calculation and acceptance after the foundation pit is completed show that this is a good solution, high reliability and can be applied to seal the bottom of the foundation pit in similar geological conditions.

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