›› 2009, Vol. 30 ›› Issue (11): 3342-3346.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

A simple method to predict traffic-load-induced permanent settlement of road on soft subsoil

WEI Xing1，HUANG Mao-song2   

  1. 1. Department of Geotechnical Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
  • Received:2008-03-17 Online:2009-11-10 Published:2010-01-07

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Abstract:

Excessive settlement of road on soft subsoil induced by traffic load is the main reason leading to pavement failure. To predict this part of settlement correctly is very important for road design. A simple empirical model for predicting residual strain under repeated load suitable for soft clays is proposed based on test results. The validity of the model is verified by cyclic triaxial test results of Shanghai soft clays. For practical boundary value problems, the traffic-load-induced dynamic stress is calculated by multilayer elastic theory; the residual strain distribution of subsoil induced by traffic load is calculated by the proposed model; and then the settlement can be given by integrating the residual strain along depth. A practical problem, Saga Airport Road, is analyzed to illustrate the proposed prediction method.

Key words: road, traffic load, residual strain, post-construction settlement

CLC Number: 

  • U 416.1
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