Study about Non-uniform Collapsibility Specfic Property of Loess
|Keywords||loess infiltration non-uniform collapsibility test in situ infiltration front ADINA|
This paper relies on the scientific project which belong to Department of transportation ofShanxi province《Research of the collapsible loess pile group of bridge bearing characteristicand the engineering optimization》(Project No.10-2-20). Chang’an University take in part ofthe subject about non-homogeneous collapsible condition of group pile bearingcharacteristics.As everyone knows, loess collapsibility is closely related to water.If we wantto study the non-uniform properties of loess collapsibility, we must first research theregularity of loess’s water migration and development under soaking water, that is the Loessinfiltration characteristics. Based on the uniform seepage characteristics analysis, study loessseepage condition in structures action of occlusion and provide the basis to study the loesspile group of bridge bearing characteristic under non-uniform collapsibility characteristics.Based on the comparison analysis between result of soil test which includes liquid limitand plastic limit, permeability test, pH test results and so on and result of physical andchemical index value of Shanxi areas, from the perspective of laboratory tests to analysis theproperties of collapsible loess. Analyse the influence degree of area’s physical and chemicalindexes to Loess collapsibility.Based on three kinds of small pooling infiltration testing of loess in situ, which were smallsoil uniform seepage test, nonuniform seepage tests under occlusion of model piles under theand pile group under the shelter effect. Through the determination of the characteristic sectionwater content, has got the influence range of seepage in two cases before the next. Throughcomparison the infiltration front arrival time under two kinds of situations which distancefrom the centre of the infiltration tank and the depth of the holes is equal, analyzed theocclusion influence under the action of model pile which by calculating the lag timedifference of infiltration front arrival time.Using the software ADINA to numerical imitate the in-situ seepage test, indicating thatusing the software to imitate seepage experiment is feasible.