Study On The Rheological Character Of Compacted Loess And Its Engineering Application

In this thesis, the author has studied the subsidence distorts regulation of foundation-soil in loess area with stress and time changed., found a mathematics model which can reflect the rheological character of compacted loess, the model bases on lots of scene tests and laboratory experiments, using mathematical and mechanical analysis method. In the paper, author discussed that water content and compactness tow factors reflect structure yield strength of compacted loess, that decided the rheological character of compacted loess. Finally, computed result using the model contrasts to the project actual observation result in order to confirm accurate of the model.Through contrast to physical mechanics parameter and the electron-microscope scanning photos between natural loess and compacted loess, From the microscopic view, the thesis discusses the change of loess microstructure influence which produces to the loess rheological characteristic and hang strikes energy size influents to the regulations of the loess basic physical mechanics parameter changing and effective influential depth. Through analyzes in the scene tests and the laboratory experiments result, we can directly find out the regulations of compacted loess distorts changing with time changing under the different stress levels, and the changing of water content in the soil influent to the structure yield strength of compacted loess. The test results indicates that the structure yield strength of compacted loess and the water content and compactness have an exponential function relation ,the amounts of distort and the logarithm of time have a linearity relation.Because of compacted loess rheology has the obvious coherency, elasticity and plastic characteristic, before synthetically considers to all factors influence compaction loess rheological characters, and bases on lots of scene tests and laboratory experiments, obtained mathematical model which can forecast the amounts of distort of soil mass processed with different hang strike energy. Then, we contrast to project actual observation result and computation result by using model in order to certify the accuracy of the model.