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In the field of pile foundation engineering, conventional concrete bored piles often fail to fully utilize the bearing capacity of the soil. However, a new type concrete expanded base pile(NT-CEP) offersexcellent bearing performance, which can significantly optimize and reduce the use of concrete and steel, lowering construction costs. Due to the expanded-end structure of NT-CEP altering the stress distribution in the surrounding soil, the conventional pile cap-soil interaction theory based on uniform-diameter piles is no longer applicable. Currently, there is a lack of research on the influence of the physical parameters of soil under the pile cap on the bearing performance of NT-CEP piles. Therefore, focusing on the primary factors affecting the bearing performance of NT-CEP pile foundations beneath the cap, this paper employs the ANSYS finite element simulation method to systematically analyze the influence mechanisms of variations in dry density and moisture content of the soil beneath the cap on the compressive bearing performance and failure mode of the NT-CEP pile foundation. It is concluded that under conditions with a moisture content of 10% to 22%, the gradual increase in moisture content leads to greater vertical displacement and range, weakened lateral load transfer capacity, and reduced overall bearing capacity. Under conditions with a dry density of 1.45 to 1.72, the gradual increase in dry density enhances the soil's shear strength and compaction, strengthens lateral load transfer, reduces vertical load burden, and results in a wider lateral but shallower vertical displacement influence range. This paper provides a basis for optimized design methods, promotes the scientific application of NT-CEP piles in engineering practice, and contributes to the high-quality and sustainable development of foundational engineering.
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Basic Information:
DOI：10.20203/j.cnki.2095-8919.2026.04.005
China Classification Code:TU473.1
Citation Information:
[1]Liu Bingyi,Qian Yongmei,Li Gang ,et al.Analysis of the effects of soil parameters beneath the cap on the bearing performance of NT-CEP pile foundations[J].Journal of Jilin Jianzhu University,2026,43(04):34-41.DOI:10.20203/j.cnki.2095-8919.2026.04.005.
Fund Information:
国家自然科学基金项目（52078239）
2026-08-15
2026-08-15