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Title of Journal: J Cent South Univ

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Abbravation: Journal of Central South University

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Springer Berlin Heidelberg

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DOI

10.1002/job.4030140701

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2227-5223

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Design method of pileslab structure roadbed of ba

Authors: Yongxiang Zhan Hailin Yao Guanlu Jiang
Publish Date: 2013/07/10
Volume: 20, Issue: 7, Pages: 2072-2082
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Abstract

Pileslab structure roadbed is a new form of ballastless track for high speed railway Due to lack of corresponding design code based on the analysis of its structure characteristics and application requirements it is proposed to carry out load effect combination according to ultimate limit state and serviceability limit state and the most unfavorable combination of each state is chosen to carry through design calculation for pileslab structure Space model of pileslab structure can be simplified as a plane frame model by using the orthogonal test method and the design parameter of pileslab structure is optimized Moreover based on the engineering background of SuiningChongqing highspeed railway the dynamic deformation characteristics of pileslab structure roadbed are further researched by carrying on the indoor dynamic model test The test results show that the settlement after construction of subgrade satisfies the requirement of settlement control to build ballastless track on soil subgrade for highspeed railway Slab structure plays the role of arch shell as load is transmitted from slab to pile and the vertical dynamic stress of subgrade soil is approximately of “K” form distribution with the depth The distribution of pile stress is closely related to soil characteristics which has an upset triangle shape where the large dynamic stress is at the top Pile compared with soil shares most dynamic stress Pile structure expands the depth of the dynamic response of subgrade and improves the stress of subgrade soil and the speed of train has limited effect on dynamic response These results can provide scientific basis for pileslab structure roadbed used on soil subgrade

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