Based On The Measured Data Of Highway Soft Foundation Settlement Research For A Long Time

Highway disasters, such as big settlement and cracks, are caused to highway built over soft foundation, affecting the use of highway. So study on post-construction settlement should be emphasized. Based on observational data of Lianyan and Chongqi highway, comparing factors of the post-construction settlement of foundation from different aspects. Main contents are as follows:(1)Comparing the generation mechanism of soft soil foundation and engineering geological conditions of the two highways. Study on detailed statistics of the magnitude from the first post-construction settlement to the second.(2)A grading hyperbolic curve, exponential curve method and gray Verhulst forecasting model are adopted to predict the final post-construction settlement, which is modified by comparing from the correlation coefficient and the relative error. A grading hyperbolic curve is applicable to Lianyan highway and the gray Verhulst forecasting model is applicable to Chongqi highway.(3)Height of fill and thickness of the soft soil were positively correlation with post-construction settlement;three methods for ground treatment of Lianyan in the controleffect of soft soil subgrade of post-construction settlement by the high exactly in the ordenspray powder pile>wet jetting piles>flaky+concrete,four methods for groundtreatent of Chongqi in the control effect of soft soilsubgrade of post-construction settlemetbythe high exactly in the order:PHC pipe pile>wet jetting piles+surcharge preloading>wet jetting piles>surcharge preloading.(4) Using ABAQUS software for two typical cross-section area, respectively, set up two finite element models, one is not consider creep properties of soil,the second is considering creep properties of soil,to analysis the post-construction settlement caused by creep settlement size and developing change rule.