Analysis of the Main Controlling Factors of Differential Settlement of Widened Roadbed and Research on the Selection Basis of Foundation Treatment
Taken a highway roadbed reconstruction project in Shandong as an example,the process of roadbed widen-ing construction and settlement after construction was simulated by FLAC finite difference software.The effects of six factors of the width of roadbed widening,the height of roadbed fill,the modulus of roadbed fill,the ratio of new to old foundation modulus,the cohesion of roadbed soil,and the internal friction angle of roadbed soil on differential settlement of the widened roadbed were studied.The main controlling factors were determined by orthogonal analy-sis.The results indicated that the width of roadbed widening,the height of roadbed fill,and the ratio of new to old foundation modulus are the main controlling factors of differential settlement of the widened roadbed;Therefore,a single-factor analysis was carried out focusing on the influence of the ratio of new to old foundation modulus on dif-ferential settlement of the widened roadbed.The concepts of primary and secondary reinforcement areas were pro-posed as well as the selection basis for the foundation treatment schemes.The study have significant reference value for the control of differential settlement of highway roadbed widening.
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