Study Of The Inner Pore In Calcareous Sand

The calcareous sand is a special rock and soil medium which composes much carbonate and is generated in marine environment,and it is wise distributed in South China Sea. With the requirement of the exploitation and defence in the islands,especially for the requirement of the fossil oil exploration and tourism,much more projects will be built in the sea and the scale will be larger. It is very significant to study the calcareous sand for supervision of design,construction and security check.So is to the development of our politics and economy.Without long distance transport and kept with small pore in the grain,calcareous sand has typical mechanics,such as much inner pore,irregularity shape,low strength.It is found that with the existence of the inner pore,calcareous sand has obvious characters ,such as easy breaking,hard saturation and high compression.So it is very needed to study the inner pore and establish the relationship of the inner pore and mechanical property for comprehension of the typical property in calcareous sand.The main work can be concluded as follows:1,Experimental method of the inner pore is found. Because of the low strength and inner pore in shape,calcareous sand is hard to get a smooth cross-section.Laser cold chipping is used and a smooth cross-section is obtained.2,The inner pore is found.With the image analysis software,the image is digital analysed and the parameters of the inner pore are obtained.And the fractal theory is used to the distribution of the inner pore.3,The result of the inner pore is applied in particle strength.With the characters of the inner pore in size and distribution, the theory of fractal and JAYATILAKA-TRUSTRUM is used to analysis of particle strength.The results indicate that the particle strength of calcareous sand exhibits Weibullian behavior,and the Weibullian modulus obtained to the distribution of the inner pore can much meet the need of the strength analysis.4,The influence of the inner pore in saturation of the calcareous sand is preliminary analysed.Because of the reuse of the calcareous sand,the phenomena of hardness saturation become unconspicuous.With the results of the inner pore and theoretical derivation, the influence of the inner pore in saturation is preliminary analysed.5,The achievements of this study are summarized,and the research direction of the calcareous sand is also presented.