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2, FEI Xue-liang(费雪良)
3(1.Transportation Research Center, Beijing University of Technology, Beijing 100022, China; 2.Ning Xia Hui Autonormous Region Communications Department, Yinchuan 750000, China; 3.China Highway Engineering Consulting Group Company Ltd.,Beijing 100097,China) Abstract: Criterion of differential settlement in subgrade is useful for keeping road in a good serving condition. The theory of traditional materials strength and their technologic economy are applied to analyze the additional bend stress of the pavement structure,the equivalent beam of elastic foundation and influence on the pavement structure of an uneven settlement. The allowable settling ratio of pavement index (Δ
i) is got and is used to appraise the uneven settlement standard value in subgrade. The allowable settling ratio of pavement index is applied in an certain widening expressway project and Δ
i0.36% is attained by the analyzing, calculating and adding a certain safe coefficient. This value was put into practice and is effective during the past two years. Key words: widening and reconstruction project; differential settlement; allowable settling ratio CLC number: U?491 Document code: A Article ID: 1004-0579(2009)02-0176-05 Received 2008-06-16 Sponsored by Project of Ning Xia Hui Autonormous Region Communications Department 2005 Biography HU Jiang-bi(1965-), professor, Ph.D., hujiangbi@bjut.edu.cn. The settlement of subgrade especial for new subgrade after construction can exert additional stress in pavement, which could cause structural damage once the sum of this stress and traffic load exceeds the allowable strength of pavement
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