The Study On Engineering Application Of CFG Piles Composite Foundation In Loess Regions

The compound ground natural foundation can enhance the ground supporting capacity, the control to distort, also compared to the pile foundation economy, obtained the widespread application.Loess the age which forms according to it may divide into, forms under pleistocene epoch Q1 noon city loess and pleistocene epoch Q2 to the stone loess, is called the old loess. The universal cover takes to bring with pleistocene epoch Q3 on the above loess and the valley terrace the Malan loess and lower part the brand-new world Q4 secondary loess, calls it the new loess. In addition, but also had recently piled up the loess, was the Q4 newest deposit, many formed for in the recent several dozens years to nearly several hundred years. Generally, the early loess for the primary loess (or loess), becomes the host by the wind, but Q4 either Q4 short-term loess for secondary loess (or kind of loess, yellow earthy earth), by Shuicheng primarily.The CFG pile compound ground is falling wet the loess area application and the construction craft, the quality control research is quite full, however about are not many in the common loess's application's literature. The South Shanxi some city some project ground is the Q4 loess. The CFG pile first time applies in this city high-rise construction ground treatment.This article carries on the analysis and the research after this question, draws the following conclusion:(1) Through to the CFG pile compound ground domestic and foreign research present situation and trend of development's overall analysis, proposed the CFG pile compound ground in loess area high-rise construction ground treatment serviceability. (2) In the CFG pile compound ground's mattress level may urge between the pile the earth and the basis maintains throughout the close contact and the stress adjustment, in the ground vertical stress distribution obtains the equalization, the compound ground's supporting capacity obtains enhances greatly.(3) To guarantee that the CFG pile compound ground the project quality, in the construction should adopt acts recklessly the way, prevents the pile body to receive the extrusion destruction; Control blend slump; Reservation certain guard stake is long.(4) Through field test, this location, when the CFG pile shaft concretes intensity rank is C20, pile diameter 0.40m, pile spacing 1.5m, assumes the equilateral triangle arrangement, the effective pile length is 6.5m, the tip of pile holds the strength level isâ‘¢The level round gravel bed, the CFG pile compound ground supporting capacity characteristic value is not smaller than 340kPa.