Abstract：Research purposes:In order to ensure the safety of railway or highway subgrade，roadbed bearing capacity， embankment stability and settlement which are the three main control index of subgrade design should be checked in theory. However, many railway and highway designers still have differences on whether roadbed bearing capacity should be checked in our country. Through analyzing the relationship among roadbed bearing capacity，stability and settlement of embankment, the necessity of checking roadbed bearing capacity is discussed in this paper.
Research conclusions:(1)Comparing with roadbed bearing capacity，circular arc method is more unsafe used to check the embankment stability.(2)The lateral displacement of roadbed will increase sharply when the load on roadbed approaches or exceeds roadbed bearing capacity，and the existing settlement calculation methods are no longer applicable. The application condition of settlement calculation methods is that the requirement of roadbed bearing capacity is met. ( 3)In order to ensure the stability of the embankment and control the settlement of embankment，the roadbed bearing capacity should be checked in the design of subgrade.(4)Conclusions of this paper can provide a theoretical basis for the further improvement of subgrade design method.
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2014, Vol. 31 
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