Study On Dynamic Behavior Of Saturated Calcareous Soil Due To Explosion

Calcareous sand is a special marine geotechnical medium,which has unexpected physical and mechanical property due to its origin and fabric.For the considerations of national defense and military security,there are needs to study on dynamic behavior of saturated calcareous soil due to explosion,study explosive wave propagation,explore saturated calcareous sand compacting mechanism of the explosion,which will provide basic scientific research satisitics for disaster proof and relief and the settlement of practical engineering problems.Taking Nansha islands calcareous sand as the object of the study,this paper has summarized dynamic behavior and explosive wave propagation of saturated calcareous soil through indoor mini-explosion test,theoretical analysis,numerical simulation and so on.The main points are as follows:1.Looking back the research history and present situation,the dynamic behavior of saturated soil due to explosion has been analyzed based on wave propagation theory.2.To study attenuation rules of earth pressure,pore pressure and acceleration in different relative density calcareous soil due to explosive load through indoor mini-explosion test.And then summarize dynamic behavior and explosive wave propagation of saturated calcareous soil.3.To explore compacting mechanism of the explosion and study compacting effects under different explosive parameter through indoor mini-explosive compacting experiment.4.To make comparative study of the dynamic behavior and compacting features between calcareous sand and ordinary sands through explosive experiment.In the experiment,two kinds of relative density of ordinary sand are chosen:40 percents and 56 percents.5.Based on effective stress analysis,the elastoplastic dynamic model of saturated sand is programmed and interfaced with the FLAC code.The characteristics of the propagation of stress wave in saturated sand under explosive loading is simulated and analyzed.