Study And Numerical Analysis On The Pit Frost Heave Influencing Factors In Shenyang Area

In recent years, civil engineering entered into the era of rapid development,security issues are also relatively increased. Among them, the security issues of seasonal frozen soil area aroused more and more engineering attention. On the permanent works, the problem of frost heave were took note by pundits. For example, the frost heave problems of the water conservancy engineering, normal Frost heave problem of basement, the frost heave problems retaining wal, Although the heave problem of temporarily supporting structures were relatively few concerned by scholars, the hidden trouble of safety of temporary support structure should not be ignored. The frost heave problems of foundation pit supporting structure. Design of overwintering foundation pit’s frost heave problems based Frost heaving force calculations here on assumption that it is only consideration of soil pressure. If the foundation is overwintering, the influence of frost heave is need’d to consider, and to take corresponding measures. But how to consider the influence of frost heave, how to calculate that the frost heave force, the relationship between frost heaving force and supporting system of the constraint function, specification are not introduced, this is our research content.This paper takes a deep excavation engineering in Shenyang as an example. The design of foundation pit is not considered overwintering,through Monitoring of the monitoring points on the crown beam, we can get the frost heave displacement dataWhen frozen soil occurs to freeze in the winter.using FLAC3D simulation software to carry on the simulation The excavation of foundation pit and the frost heaving process, through Comparing the excavation simulation value with the practical monitoring data, we can confirm correctness of the parameters for numerical simulation of foundation pit. By changing the parameter of the foundation soil thickness,soil water content,the outside temperature field, the time. In order to get the effect of these factors on the amount of heave. Finally, the design of foundation pit didn’t consider Winter frost heave, we get temporary supporting structure of pile top displacement prediction equation.This paper mainly use the simulation method to predict deep foundation pit heave displacement, it will certain reference value’and guiding significance for the design and construction of deep foundation pit engineering in the rwinter.