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Experimental Study and Fem Analysis of Rock-Socketed Pile under Static Lateral Load

Author: LiZuo
Tutor: BaiXiaoHong
School: Taiyuan University of Technology
Course: Geotechnical Engineering
Keywords: rock-socketed pile lateral load finite element method
CLC: TU473.16
Type: Master's thesis
Year: 2009
Downloads: 44
Quote: 4
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Abstract

Because of the high bearing capacity and small settlement, rock-socketed piles as the base of bridge and high building have been widely applied since Nineties of 20th century in China. There will be more and more applications of rock-socketed piles which mainly bear the lateral load in projects specially; however, we still lack the study of their behavior. So, the lateral bearing property of rock-socketed piles has been concerned by engineering and academia.For the complexity of interaction of pile-soil-rock system, testing to the piles is the most important way to check out the bearing trait of them. In this paper, through the static lateral bearing test of four rock-socketed piles with embedded element, data is obtained and processed. The experimental results contain lateral load vs. lateral deformation at the top of the single pile, lateral horizontal load vs. lateral deformation gradient, the steel bar stress distribution of the single pile, the moment vs. depth and critical load.Secondly, by the help of MIDAS, which is a soft ware of the finite element method, we make a numerical simulation analysis of rock-socketed piles under the lateral loads. Considering the interaction characteristics between rock-socketed piles and soil, it can better reflect the actual performance of rock-socketed piles under the lateral loads. Because of the good correspondence of the FEM results and test data by comparing, the three-dimensional FEM model is effective and reliable. Based on this model, some influence parameters of the lateral carrying capacity, such as the elastic modulus of pile, the diameter of pile, the embedding depth of the pile, the modulus of soils and the modulus of rock have been discussed. The results indicate that the elastic modulus of pile has a certain impact on the lateral carrying capacity of rock-socketed pile, increasing the elastic modulus of pile can improve the lateral carrying capacity; the diameter of pile has a large impact on the lateral carrying capacity of rock-socketed pile, and increasing the diameter of pile can improve the lateral carrying capacity, but the level of improving is limited; the embedding depth of the pile at the end has the best value which is about 3 times of the diameter of pile; the elastic modulus of soils also affects the lateral bearing capacity, and the lateral deformation at the top of pile reduces with the modulus of soils increases. At the same time, it is adverse to the lateral carrying capacity of rock-socketed pile when the modulus of the top layer soil is smaller than that of the follow layer. The rock’s modulus has some impact on the lateral carrying capacity of rock-socketed pile, increasing the modulus of rock can reduce the lateral deformation at the top of pile.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile > Pile test
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