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Geomechanics and Engineering
  Volume 13, Number 5, November 2017 , pages 757-774

Variability of subgrade reaction modulus on flexible mat foundation
Sangseom Jeong, Jongjeon Park, Moonhyun Hong and Jaehwan Lee

    The subgrade reaction modulus of a large mat foundation was investigated by using a numerical analysis and a field case study. The emphasis was on quantifying the appropriate method for determining the subgrade reaction modulus for the design of a flexible mat foundation. A series of 3D non-linear FE analyses are conducted with special attention given to the subgrade reaction modulus under various conditions, such as the mat width, mat shape, mat thickness, and soil condition. It is shown that the distribution of the subgrade reaction modulus is non-uniform and that the modulus of subgrade reaction at both the corners and edges should be stiffer than that at the center. Based on the results obtained, a simple modification factor for the subgrade reaction modulus is proposed depending on the relative positions within the foundation in weathered soil and rocks.
Key Words
    subgrade reaction modulus; mat foundation; numerical analysis; non-uniform; modification factor
Sangseom Jeong, Jongjeon Park and Moonhyun Hong: School of Civil and Environmental Engineering, Yonsei University, Seoul, 120-749, Republic of Korea
Jaehwan Lee: Road Infrastructure Maintenance Office, KISTEC, Gyongsangnam-do, 52852, Republic of Korea

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