Research Status and Achievements Summary of Differential Settlement in Road Widening
In order to systematically understand the status quo and achievements of the research on differential settlement in road widening engineering,576 related articles in 1997-2021 were sorted,and the development history,the main research contents and the actual project cases of this issue were summarized herein.Depending on the induction of the factors influencing differential settlement in road widening engineering,the method classifying the internal and external factors,and the direct and indirect factors was put forward.By integrating the rules and features of every factor influencing the differential settlement curve,the generalized model incorporating three patterns of differential settlement curve,i.e.bidirectional variation,unidirectional local variation and unidirectional global variation,was built.The influence law of differential settlement on the stress of pavement structure layer was concluded.The position of the layer controlling tensile stress between the new and old pavement was determined,and the generalized guideline to calculate the criteria controlling differential settlement was established.In addition,the variety of techniques decreasing and controlling differential settlement were sorted out so as to compare the applicability,advantages and disadvantages of each technique.On the basis of the research status,the direction of research on differential settlement of top surface of new and old subgrade was prospected.
road wideningdifferential settlementresearch achievementcurve modelcontrol standarddecreasing and controlling techniques
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