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| Research on the Relationship among Subgrade Bearing Capacity, Embankment Stability and Settlement |
| LI Jian-guo1,WANG Xun2, SUN Li-xun2 |
1. Southwest Jiaotong University, Emeishan, Sichuan 614202, China;
2. China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China |
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Abstract Research purposes:In order to ensure the safety of railway or highway subgrade, subgrade bearing capacity, embankment stability and settlement which are the three main control indexes of subgrade design should be analyzed and checked in theory. However, many railway and highway designers still have differences on whether subgrade bearing capacity should be calculated in our country. Through analyzing the relationship among subgrade bearing capacity, embankment stability and settlement, the necessity of checking subgrade bearing capacity is discussed in this paper.Research conclusions:(1) It is unsafe that circular arc method is used to check the embankment stability, in the case that subgrade bearing capacity does not meet the requirements, the conclusion that embankment is stable can be also drawn. (2) The lateral displacement of subgrade will increase sharply when the load approaches or exceeds subgrade ultimate load, and the existing settlement calculation methods are no longer applicable. The application condition of settlement calculation methods is that the requirement of subgrade bearing capacity is met. (3) In order to ensure the stability of the embankment and control the settlement of it, the subgrade bearing capacity should be checked in the design of subgrade. (4) In this paper, the research conclusion can provide a theoretical basis for the further improvement of subgrade design method.
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Received: 13 May 2014
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2014, Vol. 31 
