Influence of differential settlement on pavement （不均匀沉降对路面的影响）.pdfVIP

Journal of Rock Mechanics and Geotechnical Engineering. 2011, 3 (1): 90–96 Influence of differential settlement on pavement structure of widened roads based on large-scale model test Xiaolin Weng1, 2, Wei Wang3 1 Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi ’an, 710064, China 2 CCCC First Highway Consultants Co., Ltd., Xi ’an, 710068, China 3 Henan Vocational and Technical College of Communications, Zhengzhou, 450005, China Received 29 December 2010 ; Received in revised form 5 February 2011; accepted 15 February 2011 Abstract: This study introduced at first the background of numerous highway widening projects that have been developed in recent years in China. Using a large ground settlement simulator and a fiber Bragg grating (FBG) strain sensor network system, a large-scale model test, with a similarity ratio of 1:2, was performed to analyze the influence of differential settlement between new and old subgrades on pavement structure under loading condition. The result shows that excessive differential settlement can cause considerable tensile strain in the pavement structure of a widened road, for which a maximum value (S) of 6 cm is recommended. Under the repetitive load, the top layers of pavement structure are subjected to the alternate action of tensile and compressive strains, which would eventually lead to a fatigue failure of the pavement. However, application of geogrid to the splice between the new and the old roads can reduce differential settlement to a limited extent. The new subgrade of a widened road is vulnerable to the influence of dynamic load transferred from the above pavement structures. While for the old