To solve problems such as the lack of foundation bearing capacity of calcareous sand in South China Sea island projects,in this paper,the effects of different polymer(PFA)and basalt fibre(BF)con-tents on the compressive and shear strength of calcareous sand were investigated by unconfined compres-sive strength test and direct shear test.The results showed that the compressive strength and shear strength of calcareous sand increased with the increase of PFA and BF content,The increase in compres-sive strength increases significantly when BF and PFA are content at 0.6％and 6％respectively,and the increase in the angle of internal friction and the cohesion of the specimens is slowed down when the BF dose exceeds 0.3％.Finally,SEM and HD digital microscopy revealed that PFA was able to bond dispersed calcareous sand particles and wrap small particles to enhance interfacial interactions,In addition,BF in-creases the sliding friction of the calcareous sand and together with PFA it forms a large fibrous network which improves the strength properties of the calcareous sand.
关键词
建筑材料/力学特性/改良机理/高聚物/玄武岩纤维/钙质砂
Key words
construction materials/mechanical properties/improvement mechanisms/polymers/basalt fibres/calcareous sand
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