Research And Analysis Of Marine Sedimentation Patterns Soft

With the rapid development of the national economy,for highway construction are increasingly high quality requirements,and in Highway Construction,after soft soil subgrade settlement control has become an important indicator of quality control. How to design foundation treatment scheme, rational planning construction schedule has become a major issue to be urgently addressed soft roadbed, soft soil subgrade settlement observation and analysis of the data through the observation of the settlement within the design life prediction, Become an inevitable way to solve this topic.Based on the Tianjin Binhai New Area in the construction of roads across the pond to rely on section, through the marine soft soil subgrade K13 + 840 ~ K14 + 000 section of the actual site of geological observations and associated data analysis, get the load- settlement- time curve. At the same time, prediction of gray theory system model to establish the settlement observation data for the final settlement amount, from processing B.Spnlie cubic spline interpolation function to the original data, etc. And apply the finite element software ANSYS to simulate the soft soil subgrade. The results of numerical simulation with the measured data, the use of gray theory predicted data were analyzed, By analyzing the consolidation to be able to achieve the establishment of the Tianjin area pond backfill settlement patterns. For subsequent backfill play a guiding role in pond, The main contents of this paper and conclusions are as follows:(1) Marine clay subgrade settlement general rule deformation: During the construction of the embankment load,settlement significantly accelerate the development of the monitor, stop after loading a certain time, sedimentation rate fluctuations consequent slowing, settlement curve to flatten, During the preloading embankment, sedimentation rate tends to converge to a smaller value.(2) Through the analysis of simulation data, can be realized on Embankment rate control, consolidation of foundation construction period to determine the configuration of the situation projections and road and building material. Early in Embankment, minimize the fill thickness, after completion of the soil gradually Consolidation, may be appropriate to speed up the embankment fill thickness.(3) Through on-site settlement data accumulated subsidence curves plotted using ANSYS finite element software to simulate the vertical displacement of subgrade settlement observation points compared with the curve shows the time: Finite Element Analysis of the cumulative settlement of soft ground with the actual observed data curve plotted cumulative settlement curve its settlement trends are the growth over time are gradually converge to a stable value. Description of the settlement using this model to simulate roadbed is feasible. Finite element simulation analysis results smaller than the measured data, The main reason for this result is: Did not consider the impact of seepage factors in soft roadbed simulation process, and in the course of Heaping, Without considering the impact of changes in groundwater levels and pore water pressure.(4) Comparison of predicted and observed values subgrade settlement GM(1,1) model, And analyze the prediction results, can be found, GM(1,1) model for settlement prediction of roadbed construction sequence generated in the beginning of the relatively large errors, When the actual number of columns settlement observation observing a growing number of, the relative error tends to decrease, factors in the observation process construction conditions, changes in environmental conditions, observers and other errors by the competent, there are fluctuations in the local. The more observational data in the actual Settlement Observation, GM(1,1) model prediction accuracy is higher.