To study the distribution of the additional stress in soil under various loading modes, micro earth pressure gauges are buried at different positions from the horizontal direction of a pile body and at different depths in the vertical direction, and model tests of the top-loaded pile (with soil under the pile and without soil under the pile), the bottom-supported pile, and the O-cell pile under the same conditions are carried out. The results show that the additional stress in the soil increases with increasing load on the pile body and shows a linear distribution. Under the same load, the additional stress of the top-loaded pile is greater than that of the bottom-supported pile. The value of the additional stress in the soil at a distance of 1.7d from the horizontal direction of the pile body is relatively large, while that at a distance of 4.5d becomes very small, which is only 1/14 to 1/10 of that at 1.7d. In the depth direction, the distribution of the additional stress in the soil of the pile under the top-loaded mode is an inverted triangle, while that under the bottom-supported mode is a triangle. The top-loaded pile shows a loading effect on the soil in the range of 4.5d, and the bottom-supported pile shows an unloading effect. Under the condition of the O-cell test pile, the loading effect of the lower section pile on the bottom soil of the pile is greater than that of the traditional static load test.
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Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 4, July-August, 2021.
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Ma, HL., Bao, YR., Ma, YF. et al. Research on Model Tests of the Additional Stress in Soil Caused by Pile Loads. Soil Mech Found Eng 58, 332–338 (2021). https://doi.org/10.1007/s11204-021-09746-8
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DOI: https://doi.org/10.1007/s11204-021-09746-8