Deformation Of Multilayer Roadbed-soil Tamped In DU WEN Expressway And The Relations With Water

Currently it is deemed saturated soil to analyse,design and construct during practice project .But with the depth in cognition and research, for some special area or characteristic soil ,the predigestion would arouse misplay of theory and waste of engineering.Exist of hole is the reason of complicated character of unsaturated soil ,and make soil contain chief stress and suck .It is more complicated unsaturated soil's deformation and intension characteristic than saturated soil's. Suction directly affect the whole theory frame of unsaturated soil, and it tie up engineering characteristic of unsaturated soil. Based on the point, author read and analyzed lots of literatures and data, summed up the achievements on theory about unsaturated soil lately, then brought forward basic task.DU-WEN Freeway multilayer temper remolded roadbed unsaturated-soil is the object of the thesis. By simulation-testing, I research deformation characteristic of multilayer-tamper roadbed-soil. The change of every layer-soil stress and strain under different load and depth was gained by the data. Many academicians recur to lab-test to finish the research anciently, but crude fame of soil is easily destroyed, it is difficult to gain exact theory . The crude feme of tamper-soil would be destroyed during construction, thus original soil would have no use for the test, and it is more exact to describe the characteristic. The relation among matrix suction, round-press and water content was gained through tri-axial experimentation Based on the comment about research status of unsaturated soil characteristic and considering more complicated SWCC-equations that anciently academicians put forward , what's more ,unknown parameters generally arc gained by experience, and it is difficult to apply these equations .Author started with the relation of matrix suction and water content, and deduced simple and applied expression of SWCC what is applied with the engineering through stat analysis theory.Whereas examination condition and instance of the engineering, linking the SWCC- expression which was put previously, author applied generalized HUKE-LAW and the relation of saturated soil stress-strain which was put forward by Fredlund in the distance of non-linear flexibility one-dimension, and gained the stress-strain expression that is applicable to the engineering. Because of the delamination and for the sake of applicability of the expression, tangent-elastic modulus was replaced by deformation modulus. Deformation modulus proved recipe is ongoing under whole load, which is an attempt towards layer-soil research.The foregoing theory would be used to direct construction practice.