Papers by Keyword: Squeezed Branch Pile

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Authors: Jin Lu Jia, Zhong Fu Wang, Jian Hua Zheng
Abstract: Squeezed branch pile is based on the traditional uniform pile in development of a new type of pile, with a high bearing capacity, settlement of small features widely used in the engineering. Based on the actual project site static test, analyzed the vertical bearing capacity characteristics of two adjacent squeezed branch piles; By means of testing of the pile stress gauge steel embedded in different parts of piles, the axial force transfer characteristics of the body, support plate side resistance drag and play characteristics of the squeezed branch pile were analyzed. The results showed that: the branch pile Q-S curve is slowly varying type, the three branch share of the load ratio increases with the pile top load increases and then decreases, load sharing ratio of 12% or so. The side resistance increased with the pile top displacement, the curve showed significant enhancement traits. Measured friction value of two test piles is too conservative under the existing norms, the actual measured value of 1.2~1.6 times of the standardized value.
Authors: Wen Cui, Zi Jing Wang
Abstract: The load-transferring mechanism under the action of vertical load and the role of bearing load by bearing disks in loess area were analyzed based on results of field static loading test of the squeezed branch piles. The results indicate that load transfer law of squeezed branch pile is transferred from top to bottom, and load of bearing disks is about 60 percent of the top load of the pile, stress superposition efficiency existed between bearing disks, and the minimum critical spacing of disks is 2D (D is the diameter of the bearing disk), the estimated bearing capacity of the squeezed branch pile is higher than the measured value.
Authors: Bing Lv, Xiao Juan Gao
Abstract: Based on the self-design model experimental system of dynamic soil-pile dynamic interaction, strong horizontal dynamic load was exerted to two models of squeezed branch pile, and the bearing plate location of the two squeezed branch piles is different. The model experiment adopt digital frequency converter to control the loading frequency, and use spring of different stiffness coefficient to achieve different load level. In order to analyze the action of bending moment and the status of lateral earth pressure changes, different sizes of excitation frequency and excitation load were setted during the test.
Authors: Min Zhou, Zhong Fu Wang, Si Wei Wang
Abstract: In this paper, in order to analyze the capability of squeezed branch pile under different work condition and the cooperation mechanism between the pile and soil, non-liner numerical simulation was carried out using ANSYS. In the finite element model, the elastic-perfectly plastic Drucker-Prager material was assumed for soil. Contact interface elements were placed between the pile and soil. It showed that the squeezed branches took lots of the load, and the ratio it took was related to the load and the elastic modulus of soil; the plastic section of the soil was run-through from bottom to the top; the horizontal displacement of the top soil was moved to the pile, but the horizontal displacement of the soil of the bottom was moved away from the pile; the squeezed branch will break away from the soil above the squeezed branch when the load was at a certain value.
Authors: Ya Jun Yin, Guang Han Xu, Yong Mei Qian
Abstract: The squeezed branch pile is a kind of frictional end bearing pile which is variable cross-section, a new type of pile foundation with characteristics of high bearing capacity and low settlement. In order to explore vertical settlement regularity of the squeezed branch pile, this paper carries out the theoretical analysis and experimental research on the consolidation settlement law of the squeezed branch pile through the numerical method and static load test. The results of numerical analysis and experimental research show that vertical consolidation settlement is reduced along with increase of the squeezed branch pile diameter, and the settlement of the squeezed branch pile is given priority to consolidation.
Authors: Chun De Piao, Yong Zhao Qu
Abstract: Based on BOTDR distributed optical fiber sensing technology, this paper studies the variation law of branch pile axial force under the action of pile head loads and the action characteristic of pile side resistance during static load test. The result shows that: the branch of squeezed branch pile, as the major load-carrying object, bears most of the pile head loads and its function gradually emerges with increasing pile head loads. Under the action of pile head loads, the settlement and compression value of branch pile is elevated, which gradually brings about free face between branch and its overlaying soil layer. When the load exceed certain amount, the overlaying soil body of branch cracks under pile-soil interaction, and gradually loses its structural properties, because of which its settlement emerges and negative friction subsequently generated. Thus, during the design of branch pile, one should improve the properties of the soil layer around branch pile, enhance the strength of pile shaft, and lessen pile compressing deformation and settlement, so as to elevate the bearing capacity of branch pile.
Authors: Wei Feng Han, Bin Bin Feng, Jing Zhou, Chen Yuan Lu
Abstract: In this article, we design an experiment about model piles to study their bearing capacity and deformation properties under uplifting load of different angles, model piles include the equivalent-diameter pile, the squeezed branch pile with single plate and the squeezed branch pile with two plates. The test shows, the bearing capacity of squeezed branch pile is higher than the equivalent-diameter pile, and its plates can resist the horizontal load on the top of pile better.
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