Analysis on Stress Level of Subgrade under Cement Concrete Pavement
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U 416.1

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    Abstract:

    Factors affecting the stress level of subgrade were investigated through systemic parameter analysis, and then a 3D finite element model was established and used for load stress analysis. For typical cement concrete pavement structure, the stress of subgrade was calculated under all kinds of gear weight and configuration. Analysis result indicates that the depth of subgrade workaround and the stress level in the region were raised with increasing the gear weight and the number of axis. The stress induced by multi-axis was overlapped in the deep-seated subgrade. The stress state of subgrade was calculated by adding the at-rest pressure to the load stress which was compute by finite element analysis. The statistical result of stress state illustrates that the maximums and minimums principal stress was ranged in 30~70kPa and 10~40kPa respectively, and the principal stress ration was fluctuated between 1.9 and 6.0. The magnitude of stress in subgrade was increased 10kPa when the applied load enhanced from 100kN to 200kN, which will impact the mechanical behavior of subgrade dramatically. Thus, it is need to consider the stress-dependent behavior of subgrade in pavement design.

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linxiaoping, lingjianming, guanshengfei. Analysis on Stress Level of Subgrade under Cement Concrete Pavement[J].同济大学学报(自然科学版),2010,38(4):545~551

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History
  • Received:January 12,2009
  • Revised:February 01,2010
  • Adopted:June 05,2009
  • Online: April 28,2010
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