scholarly journals The Stress Characteristics of Numerical Analysis on Bridge Pile Foundation in High and Steep Rock Slopes

2015 ◽  
Vol 9 (1) ◽  
pp. 857-860
Author(s):  
He Zhongming ◽  
Liu Senzhi ◽  
Wu Tao ◽  
Deng Xi
Keyword(s):  
Numerical Analysis ◽  
Pile Foundation ◽  
Model Experiment ◽  
Body Force ◽  
Negative Impact ◽  
Engineering Practice ◽  
Rock Slopes ◽  
Combined Load ◽  
Theory Research ◽  
Bridge Pile Foundation

The bearing mechanism of bridge pile foundation in high-steep rock slopes is much more complex than that in the flat. In the basis of theory research and model experiment made by previous scholars, then the software of finite element method is used on numerical analysis in this paper, which systematically discusses the distribution of body force of pile, the displacement in pile top and situation of pile’s thrusting force distribution caused by the soil (rock) around the pile under the combined load, the negative impact of combined load on pile stability was also discussed, which can guide engineering practice.

Research on Punched Pile Construction–Induced Dynamic Response of Bridge Pile Foundation

2011 ◽  
Vol 243-249 ◽  
pp. 2581-2585
Author(s):  
Yan Hua She ◽  
Hua You Su ◽  
Zheng Xue Xiao
Keyword(s):  
Dynamic Response ◽  
Impact Energy ◽  
Pile Foundation ◽  
Microseismic Monitoring ◽  
Vibration Velocity ◽  
Engineering Practice ◽  
Vibration Acceleration ◽  
Testing Data ◽  
Bridge Pile Foundation ◽  
First Time

By use of the microseismic monitoring system, the dynamic response of punched pile construction of bridge pile foundation is studied and discussed for the first time. Wave data of loads acting on the construction is group-collected by means of the microseismic experiment on site. Then the waveform, vibration frequency and energy of testing data are analyzed. On the basis of the results, the weaken rules of vibration acceleration and energy are studied, and the effect of impact energy on the vibration velocity is analyzed. It shows that impact energy attenuates exponentially with the distance from the epicentre. The conclusion establishes the theoretical basis for studying the vibrant characteristic of punched pile construction, and provides valuable reference for engineering practice to take effective measures to reduce construction vibration.

scholarly journals Numerical analysis of the forming process of the bearing capacity of the auxiliary pile foundation in Permafrost area

2020 ◽  
Vol 198 ◽  
pp. 02002
Author(s):  
Sun Jianzhong ◽  
Guo Chunxiang ◽  
Wang Xu ◽  
Zhang Weijia
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Initial Conditions ◽  
Interface Temperature ◽  
Engineering Practice ◽  
Confined Water ◽  
Foundation Soil ◽  
Soil System ◽  
Heat Transfer Theory ◽  
Bridge Pile Foundation

Bore Cast-in-place Piles broke the original water and heat balance state of the stratum in the bridge construction of Qinghai Tibet railway. The settlement of a bridge pile foundation was relatively large after more than ten years of operation. It was found that there is confined water in the foundation soil after investigation. Engineers planned to add auxiliary piles at the original pile side to reduce the settlement of the pile foundation.This paper studied the temperature change, bearing capacity formation rule and long-term bearing capacity change trend of the new pile-soil system after adding auxiliary piles on the original foundation, which provides certain theoretical basis and reference basis for engineering practice. A three-dimensional model of a bridge pile foundation was established by numerical method. Considering the influence of atmospheric temperature, hydrogeological conditions, concrete temperature into the mold, and the temperature of underground confined water, based on the heat transfer theory, the boundary conditions and initial conditions are given. The influence of the change of ground temperature field and the change of pile-soil interface temperature on the bearing capacity of the foundation was studied after the auxiliary pile was poured. The analysis shows that the measure to increase the bearing capacity by adding auxiliary piles is a double-edged sword. On the one hand, the auxiliary piles themselves constitute the bearing capacity together with the original pile foundation after thawing, on the other hand, the auxiliary piles are constructed by the method of pouring concrete in the field. The hydration heat of concrete makes the temperature of the original foundation soil rise, and reduces its bearing capacity. The whole bearing capacity will not be increased at the initial stage, but also will be temporarily reduced, and the whole bearing capacity will be formed after the frozen soil is frozen back in the later stage.

A brief discussion on the causes and treatment measures of bridge pile foundation defects

2015 ◽  
pp. 45-46
Author(s):  
Juan Li ◽  
Wenhong Ren ◽  
Jihong Wang ◽  
Zhao Zhang ◽  
Xiaohui He ◽  
...  
Keyword(s):  
Pile Foundation ◽  
Treatment Measures ◽  
Bridge Pile Foundation

Tunneling influence zones for adjacent existing pile foundation in soft soil developed by numerical analysis

2013 ◽  
pp. 633-640
Author(s):  
P Jongpradist ◽  
A Sawatparnich ◽  
S Youwai ◽  
J Sunitsakul ◽  
W Kongkitkul ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Pile Foundation ◽  
Soft Soil

Service Elicitation Method Using Applied Qualitative Research Procedures

2011 ◽  
pp. 1-17 ◽  
Author(s):  
Ville Alkkiomäki ◽  
Kari Smolander
Keyword(s):  
Qualitative Research ◽  
Research Method ◽  
Systems Development ◽  
Engineering Practice ◽  
Use Case ◽  
Elicitation Method ◽  
Grounded Theory Research ◽  
Service Oriented ◽  
Theory Research

This chapter introduces QSE, the Qualitative Service Elicitation method. It applies qualitative research procedures in service elicitation. Service engineering practice lacks lightweight methods to identify service candidates in projects with tight schedules. QSE provides a systematic method to analyze requirement material in service-oriented systems development with a feasible effort. QSE uses the procedures of the grounded theory research method to elicit service candidates from business process descriptions and business use case descriptions. The chapter describes the method with examples and a case study.

scholarly journals Seismic Response of a Bridge Pile Foundation during a Shaking Table Test

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Yunxiu Dong ◽  
Zhongju Feng ◽  
Jingbin He ◽  
Huiyun Chen ◽  
Guan Jiang ◽  
...  
Keyword(s):  
Seismic Wave ◽  
Pile Foundation ◽  
Large Scale ◽  
Amplification Factor ◽  
Shaking Table Test ◽  
Seismic Intensity ◽  
Shaking Table ◽  
Acceleration Amplification ◽  
Bedrock Surface ◽  
Bridge Pile Foundation

Puqian Bridge is located in a quake-prone area in an 8-degree seismic fortification intensity zone, and the design of the peak ground motion is the highest grade worldwide. Nevertheless, the seismic design of the pile foundation has not been evaluated with regard to earthquake damage and the seismic issues of the pile foundation are particularly noticeable. We conducted a large-scale shaking table test (STT) to determine the dynamic characteristic of the bridge pile foundation. An artificial mass model was used to determine the mechanism of the bridge pile-soil interaction, and the peak ground acceleration range of 0.15 g–0.60 g (g is gravity acceleration) was selected as the input seismic intensity. The results indicated that the peak acceleration decreased from the top to the bottom of the bridge pile and the acceleration amplification factor decreased with the increase in seismic intensity. When the seismic intensity is greater than 0.50 g, the acceleration amplification factor at the top of the pile stabilizes at 1.32. The bedrock surface had a relatively small influence on the amplification of the seismic wave, whereas the overburden had a marked influence on the amplification of the seismic wave and filtering effect. Damage to the pile foundation was observed at 0.50 g seismic intensity. When the seismic intensity was greater than 0.50 g, the fundamental frequency of the pile foundation decreased slowly and tended to stabilize at 0.87 Hz. The bending moment was larger at the junction of the pile and cap, the soft-hard soil interface, and the bedrock surface, where cracks easily occurred. These positions should be focused on during the design of pile foundations in meizoseismal areas.

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