Zhang Shi Expressway Final Settlement Of The Subgade Gray Forecast

Zhai yao Zheng wenHow simple and accurately predict deformation highway roadbed trend of development is a crucial part of this guidance for the further optimization of design, the projected forecast of a hierarchy of the construction timetable to accelerate rogress of the project has a very real significance. At the same time, effective solutions in the process of filling construction of embankment stability and control of the remaining settlement, and to determine the best time for road construction, thus ensuring that the quality of highway construction.Foundation settlement theoretical analysis method can be summarized into three categories: theoretical formula; Numerical analysis and forecast of estimates. Theory formula method is simple and intuitive, and easy to fewer parameters obtained in the project which was widely used. Numerical analysis of law is as computer technology and finite element analysis of the development of a more comprehensive consideration of soil stress and strain and deformation of the complex geological conditions and boundary conditions, strict theory, but in engineering applications promotion to a certain limit. Estimates prediction method is based on field measurements of the settlement of the foundation estimates of the ultimate settlement, the more common method is right curve, and the exponential curve in the development of the gray model predictive method. Since its soft soil engineering properties of extremely complex, coupled with the upper and upper structure of load impact and the soft-soil settlement mechanism becomes very complicated existing settlement prediction method by assumptions inconsistent with the actual existence of more restrictions on settlement prediction results are often obtained with the measured values between the larger settlement differenceBased on field measurements of the settlement, the soft-stone for a highway roadbed approach to theoretical research, measured by the settlement, layered settlement, pore pressure, the lateral displacement of the information and master the soft roadbed deformation of the actual characters. To the typical end to settlement observation, the accumulation of the corresponding indicators of soil physics, compression indicators and settlement information at the scene, a gray final settlement of the theory predicted that the original settlement, such as data from the processing, and use buffer weakening operator concept to eliminate the unlimited gray prediction model by long, long improve prediction accuracy. Gray forecast model estimates of the ultimate subgrade settlement, with great theoretical and practical significance.