Analysis And Study Of Frozen-heave Force Of Clayey Soil Foundation Pit In Shenyang Area

With the speeding up of urbanization process in China, less and less land resources, city is becoming more and more intense, so the underground space development and utilization of expanding; Extreme weather is becoming more and more frequently in recent years, some parts of the winter long duration, low temperature broke the historical limit value, resulting in a series of new geotechnical problems. Seasonal frozen soil region, such as in the northeast, most of the foundation pit engineering for the maximal winter, because the winter in in the design of foundation pit, while considering the factors of frost heaving force load, but no details in actual engineering design and calculation theory model, thus causes the deformation of foundation pit supporting structure is too big, to brought a certain stage of foundation pit in the use of safe hidden trouble.In this paper, taking a winter in shenyang for the project of the deep foundation pit the pile anchor supporting structure, after the completion of excavation and supporting of foundation pit supporting pile of wintering top horizontal displacement change (crown beam) to carry on the field monitoring, the qualitative analysis of the causes of large deformation is silty clay layer soil frost heave a the horizontal frost heaving force is generated; Combining with the characteristics of pile anchor bracing of foundation pit and put forward the suitable for the pile anchor supporting structure engineering of horizontal frost heaving force distribution model diagram; Then software to analyze data is obtained by using the principle is deep foundation pit with field monitoring data, this paper compares and analyzes horizontal frost heaving force deformation correction coefficient is proposed. This paper mainly USES theoretical analysis, field monitoring and analysis method of combining the software calculation, selected topic has certain theoretical significance and engineering practical value for foundation pit supporting engineering design of wintering in shenyang area provides the certain reference value.