Geomechanics and Engineering

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Traffic-load-induced dynamic stress accumulation in subgrade and subsoil using small scale model tests

  • Tang, Lian Sheng (Department of Earth Science and Geological Engineering, Sun Yat-sen University) ;
  • Chen, Hao Kun (Department of Earth Science and Geological Engineering, Sun Yat-sen University) ;
  • Sun, Yin Lei (Department of Earth Science and Geological Engineering, Sun Yat-sen University) ;
  • Zhang, Qing Hua (Department of Earth Science and Geological Engineering, Sun Yat-sen University) ;
  • Liao, Hua Rong (Department of Earth Science and Geological Engineering, Sun Yat-sen University)
  • Received : 2016.12.08
  • Accepted : 2018.05.12
  • Published : 2018.10.10
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Abstract

Under repeated loading, the residual stresses within the subgrade and subsoil can accelerate the deformation of the road structures. In this paper, a series of laboratory cyclic loading model tests and small-scale model tests were conducted to investigate the dynamic stress response within soils under different loading conditions. The experimental results showed that a dynamic stress accumulation effect occurred if the soil showed cumulative deformation: (1) the residual stress increased and accumulated with an increasing number of loading cycles, and (2) the residual stress was superimposed on the stress response of the subsequent loading cycles, inducing a greater peak stress response. There are two conditions that must be met for the dynamic stress accumulation effect to occur. A threshold state exists only if the external load exceeds the cyclic threshold stress. Then, the stress accumulation effect occurs. A higher loading frequency results in a higher rate of increase for the residual stress. In addition to the superposition of the increasing residual stress, soil densification might contribute to the increasing peak stress during cyclic loading. An increase in soil stiffness and a decrease in dissipative energy induce a greater stress transmission within the material.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Natural Science Foundation of Guangdong Province

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