Test And Research On The Dynamic Rheological Properties Of Marine Sedimentary Soft Soil In Xiamen

Geotechnical and geological disasters, such as geotechnical slide instability, the settlement inclination of foundation were initiated easily by the accelerating rheology of soft rock-soil under the dynamic loading. Therefore, it is of important theoretical and practical significance to research on the dynamic rheological properties of soft rock-soil and the rheological dynamic mechanism of bursting out geotechnical and geological disasters. Combining with the research subject of research on the rheological dynamic mechanism of bursting out serious geotechnical and geological disasters from national nature fund, based on the widely consulting the home and aboard related literatures, this paper mainly studies on the dynamic rheological properties of the marine sedimentary soft soil in Xiamen under dynamic loading, and studies on the form of catastrophic failure in the rheological process of soft soil by the catastrophe theory, combining with the dynamic rheological test results of soft soil, the main research contents are as follows:1. The analysis and summary on mechanical characters and mode of action of various common dynamic loading in nature supply the loading basis for the study on the dynamic rheological properties of soft soil.2. The dynamic triaxial rheological test is conducted with representative sample of the marine sedimentary soft soil in Xiamen under the common dynamic loading showed sine functions as example. The influencing characteristic of different frequency and amplitude of dynamic loading for the dynamic axial strain, strain rate, strain acceleration, and the stress-strain relationship are studied by analyzing test results.3. According to the existing rheological model and rheological equation, the analytical expressions of soft soil strain, strain rate and strain acceleration under the loading of sine are derived and calculated by the analytic method of Laplace transform, the rheological properties of soft soil are qualitative analyzed in half-period.4. Based on the dynamic triaxial rheological test results, the corresponding cusp catastrophe equation is established by the catastrophe theory, the form of catastrophic failure for sample under the loading of sine with different frequency is calculated and analyzed respectively, which verify the failure process of soft soil in the. dynamic triaxial rheological test.