scholarly journals Influence of Karst Caves at Pile Side on the Bearing Capacity of Super-Long Pile Foundation

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Peisen Wang ◽  
Hongyan Ding ◽  
Puyang Zhang
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Horizontal Load ◽  
Karst Cave ◽  
Karst Caves ◽  
Karst Areas ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

The differences in development and situation of karst caves lead to two kinds of karst caves, and the karst cave may be on the pile side or at the pile bottom, which has a different influence on the bearing capacity of pile foundation. The paper presents a numerical analysis of the influence of karst caves at pile side on the bearing capacity of super-long pile foundation in karst areas. According to the size of pile foundation of a real bridge project, this paper modelized karst caves and investigated the karst cave from the effect of length, height, and thickness of roof on horizontal and vertical bearing capacity of pile foundation. The main conclusions can be drawn as: when the horizontal displacement at the top of pile foundation is greater than 0.05 m, the horizontal load is correlated positively with the length of karst cave; when the vertical displacement is greater than 0.07 m, the vertical load is correlated negatively with the thickness of the roof of karst cave. However, the height of karst cave has little effect on the bearing capacity; also the existence of karst cave has little influence on the dynamic response of pile foundation. The results of this study can be important with reference to the design and construction of pile foundations in karst areas.

Model Test Study on the Effect of Horizontal Load on the Vertical Bearing Capacity of Disk Pile

2011 ◽  
Vol 368-373 ◽  
pp. 2571-2574
Author(s):  
Cheng Yuan Lu ◽  
Jin Jin Li ◽  
Fan Li Meng
Keyword(s):  
Bearing Capacity ◽  
Bending Moment ◽  
Horizontal Displacement ◽  
Initial Time ◽  
Horizontal Load ◽  
Vertical Load ◽  
Soil Pressure ◽  
Test Study ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

A group of model tests were designed to study the effect of horizontal load on the vertical bearing capacity of disk pile. Three double-disk piles were used in the test, and the distance of the two disks is 5 times as the disk diameter. Drew a horizontal load H=100N/200N/300N on the top of pile1/2/3 respectively, and put on the vertical load stage by stage, then studied the differences of three piles’ bearing properties such as changes of the pile bending moment, the horizontal and vertical deformation on the top, and soil pressure around the pile. Experiment showed that when the horizontal load is quite small, the existence of horizontal load has little to do with vertical bearing capacity. When the load reached a certain level, the p-∆ effect under the vertical load will significantly affect the vertical bearing capacity of the pile. Especially during the initial time while there is a large horizontal displacement or rotation generated by the horizontal load, the pile’s bearing capacity is controlled by the horizontal displacement.

scholarly journals Study on the Influence of Karst Size on the Vertical Bearing Capacity of Pile Foundation

2020 ◽  
Vol 780 ◽  
pp. 022005
Author(s):  
Zhongju Feng ◽  
Suizhu Guo ◽  
Jingbin He ◽  
Zhouyi Huang ◽  
Yunxiu Dong ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

scholarly journals Numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0248502
Author(s):  
Huang Zhan-fang ◽  
Xiao-hong Bai ◽  
Chao Yin ◽  
Yong-qiang Liu
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Water Pressure ◽  
Seismic Loading ◽  
Shaking Table ◽  
Pile Spacing ◽  
Liquefiable Soil ◽  
Composite Pile ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

Composite pile foundation has been widely used in ground engineering. This composite pile foundation system has complex pile-soil interactions under seismic loading. The calculation of vertical bearing capacity of composite pile foundation is still an unsolved problem if the soil around piles is partially or completely liquefied under seismic loading. We have completed indoor shaking table model tests to measure the vertical bearing capacity in a liquefiable soil foundation under seismic loading. This paper will use a numerical approach to analyze the change of this vertical bearing capacity under seismic loading. Firstly, the Goodman contact element is improved to include the Rayleigh damping. Such an improvement can well describe the reflection and absorption of seismic waves at the interface of soil and piles. Secondly, the Biot’s dynamic consolidation theory incorporated an elastoplastic model is applied to simulate the soil deformation and the generation and accumulation of pore water pressure under seismic loading. Thirdly, after verification with our indoor shaking table test data, this approach is used to investigate the effects of pile spacing on liquefaction resistance of the composite pile foundation in liquefiable soil. The time histories of pore water pressure ratio (PPR′) are calculated for the liquefiable soil and the vertical bearing capacity in partially liquefied soil is calculated and compared with our indoor shaking table test data at the 3D, 3.5D, 4D, 5D and 6D cases (D is the pile diameter). It is found that the pile spacing has some influence on the extent of soil liquefaction between piles. The vertical bearing capacity varies with liquefaction extent of inter-pile soil. The optimization of pile spacing varies with liquefaction extent. These results may provide some reference for the design of composite pile foundation under seismic loading.

Model Test and Finite Element Analysis of Squeezed and Branch Pile Bared Vertical and Horizontal Loads

2013 ◽  
Vol 470 ◽  
pp. 1101-1104
Author(s):  
Yue Hui Li ◽  
Xiao Juan Gao ◽  
Guo Hua Zhong
Keyword(s):  
Bearing Capacity ◽  
Model Test ◽  
Horizontal Displacement ◽  
Horizontal Load ◽  
Vertical Load ◽  
Load Bearing Capacity ◽  
Element Analysis ◽  
Load Bearing ◽  
Practical Engineering ◽  
Vertical Bearing

Model tests of the squeezed and branch pile with or without vertical load are carried out and the horizontal load bearing capacity are studied in this paper. Based on the model test results, the influence of vertical load to squeezed and branch pile horizontal load bearing capacity and the influence of horizontal load to squeezed and branch pile vertical bearing capacity are analyzed with FEM. The analysis results show that the vertical load may increase the lateral bearing capacity of pile, and the horizontal load may decrease the vertical settlement, but horizontal load may increase the horizontal displacement and moment of the pile body and lead to instability and cracking failure. This should be pay more attention in the practical engineering.

scholarly journals Study on the vertical bearing performance of pile across cave and sensitivity of three parameters

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hui Yun Chen ◽  
Zhong Ju Feng ◽  
Tie Li ◽  
Shao Fen Bai ◽  
Cong Zhang
Keyword(s):  
Theoretical Model ◽  
Bearing Capacity ◽  
Axial Force ◽  
Ultimate Bearing Capacity ◽  
The Other ◽  
Karst Cave ◽  
Shaft Resistance ◽  
Karst Caves ◽  
Vertical Bearing ◽  
Centrifugal Model

AbstractA new method was used to study the performance of pile across cave. This paper investigated the vertical bearing characteristics of piles cross caves using centrifugal model tests and a theoretical model of sensitivity. Twelve pile scenarios were selected, the first was a conventional pile, 24 cm long and 2.5 cm in diameter, with no karst cave as a control. In the other eleven scenarios the piles passed through karst caves of four different heights, of four different spans, and three different numbers of caves. The results reveal that increasing the height, span, and number of caves all are negative for vertical ultimate bearing capacity of piles. The axial force and unit shaft resistance of piles are great different. According to the ratios of the tip and shaft resistance, caves change the type of piles. The sensitivity of vertical ultimate bearing capacity to these factors from high to low is height, number, and span of caves. Importantly, the bearing characteristics of piles decrease faster once the height of the prototype karst cave is higher than 9 m, but decreases slowly when the cave’s span is greater than 9 m × 9 m.

PHC Pile Bearing Capacity and Application

2012 ◽  
Vol 476-478 ◽  
pp. 759-762
Author(s):  
Er Wei Su
Keyword(s):  
Bearing Capacity ◽  
Tensile Properties ◽  
Pile Foundation ◽  
Foundation Design ◽  
Pipe Pile ◽  
Capacity Level ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

This essay introduces the PHC pile of vertical bearing capacity, level of capacity, capacity and final pressure values, tensile properties, pile the stress mechanism, and the factors that influence bearing capacity, then the useful suggestions of how to design and construct are given. It has vital significance to direct engineer practice, optimize static-pressed pipe-pile foundation design.

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