|Table of Contents|

Dynamic characteristics of cement soil pile composite foundation in flood irrigation area under traffic load(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年5期
Page:
117-128
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Dynamic characteristics of cement soil pile composite foundation in flood irrigation area under traffic load
Author(s):
YANG Han-xi1; 2;  WANG Meng-jie3;  XIA Meng-can3;  ZHANG Tian-yang3;  SUN Wei-feng4
(1. School of Economics and Management, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China; 3. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 4. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China)
Keywords:
Key words:subgrade engineering;  flood irrigation area;  composite foundation;  dynamic characteristic;  torsional shear test;  numerical simulation
PACS:
U416.1
DOI:
10.19721/j.cnki.1671-8879.2025.05.010
Abstract:
To investigate the long-term performance and deformation control of low embankment composite foundation in flood irrigation area under traffic load, hollow cylinder torsional shear tests were conducted to analyze the changes in cumulative plastic strains and dynamic elastic moduli of pure soil and cement soil under cyclic load. Quantitative expressions for the dynamic elastic modulus of cement soil were established in relation to the vertical cyclic stress ratio and cyclic torsional shear stress ratio. On this basis, numerical simulation methods were used to explore the dynamic responses of composite foundations under different cement soil pile lengths, area replacement rates, and vehicle axle loads. The research results show that the strain of cement soil under a single load is 1/8-1/6 of that of pure soil. After 10 000 cycles of loading, the cumulative plastic strain of cement soil is 1/12-1/6 of that of pure soil, and the dynamic elastic modulus is 3-4 times that of pure soil. The cumulative plastic strain of cement soil under a low vertical cyclic stress is lower than that under a higher level. While the dynamic elastic modulus shows the opposite pattern. When the vertical cyclic stress ratio is 0.15, 0.25, and 0.35, the average cumulative plastic strain of cement soil is 3.39%, 13.22%, and 16.52%, and the average dynamic elastic modulus is 127.13, 119.62, and 99.89 MPa, respectively. When the vertical cyclic stress ratio is low, the increase in the cyclic torsional shear stress ratio has a more significant effect on the increase in the cumulative plastic strain of cement soil, especially, when the cyclic torsional shear stress ratio is not greater than 0.2. The dynamic elastic modulus of cement soil decreases with the increases in the vertical cyclic stress ratio and cyclic torsional shear stress ratio. The critical threshold is determined by the vertical dynamic stress being equal to 10% of the self-weight stress of the soil. The influencing depth of traffic load on the low embankment cement soil composite foundation is about 3.5 m. Therefore, it is recommended to control the pile length of the low embankment cement soil composite foundation in the flood irrigation area at 6 m, and the area replacement rate no exceeding 16.8%.2 tabs, 11 figs, 31 refs.

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Last Update: 2025-09-30