Effect Analysis Of Cement Mixing Pile Strengthening The Songhua River Flood Land Facies Soft Soil Foundation

In subgrade construction of Expressway often meets with engineering geological conditionof road across some undesirable in soft soil area, the stability of Highway subgrade in soft soil isextremely serious, and soft soil Foundation settlement is one of the leading reasons for pavementearly damage. the soft issues of settlement (the settlement amount and rate, etc.) to study theimportance of highway construction. As China’s infrastructure development, land in softconstruction of highways, railways, water conservancy, construction, airport and terminal projectswill be increasing, and estimates of ground settlement demands will continue to improve. Thereare many advantages of cement mix piles, such as improving construction speed, no pollution, noground swelling, no sewage and no damage to nearby buildings. They have good social andeconomic benefits as well and have been more and more attention.The flood land facies soft soil Songhua river basin in Heilongjiang province by the Songhuariver meander vertical aggradation formation, is a modern flood land facies soft soil, and the mainingredients are silt soil, silty clay and silty soil.It has obvious regional characteristics. Papersrelying on Harbin city pine North culture center loop construction project, research area is locatedin K0+380~K0+620sections, is located in Songbei District of Harbin, belonging to SonghuaRiver flood plain area, original landforms for wetland, then use "take out sand to built island"construction technology, uses stranded sucking type dredger gets of kuala kangsar from Bank inroad engineering location built since for construction of "large island", in road Foundation soil inthe, has2~6m thick of soft soil foundation, components for mud mass soil, and powder sand andpowder mass clay, Engineering geological conditions of poor selection of soft soil subgradetreatment of this stretch of cement mixing pile composite Foundation treatment method.The paper by studying geological survey of soft soil location and thickness in the study area, and do the physical property tests and direct shear tests about soil samples of different depths,getting all the soil physical property parameters and internal friction Angle and cohesive force, inorder to understand test sections of the foundation soil shear strength indexes. The paper discussesthe design of the cement mix piles, construction technique and test methods. Then analysis thekey problems of quality control and makes an emphasis on quality control, test methods andsettlement control. Finally, in research district of typical sections K1+100and K1+150layouttsettlement monitoring points, on road of left shoulder, and central location and right shoulder,location of settlement data for regularly monitoring, through near one year measured data,monitoring out road cumulative settlement changes through Cement mixing pile methodprocessing, research the test sections Foundation stability and the settlement characteristics,analysis the effect of Cement mixing pile processing in Songbei District of Harbin soft soilFoundation, and analysis the main reasons of the settlement.