钙质砂压缩波速与物理性质参数关系研究

开展钙质砂纵波波速与物理性质参数关系的试验研究，对珊瑚礁地基无损检测及工程物探具有重要的理论指导意义和工程应用价值。控制试样的物性参数状态，利用制样装置进行波速测量，揭示钙质砂纵波波速与物性参数的相关关系。试验结果表明：含水率是影响纵波波速的主要因素，与纵波波速呈二次函数关系。CT扫描结果表明，试样粒径越大，颗粒内部孔隙越丰富，这导致试样孔隙比越大，波速故而越小，与粒径、孔隙比呈负相关关系。在密实度相同、不均匀系数不同时，级配良好的砂样纵波波速差异不大。经过侧限压缩后，含水率一定时，粉土纵波波速与孔隙比呈二次关系，且与密度呈良好的线性关系。利用粉土易压缩且与纵波波速紧密变化的特点，可积极探索声波在粉土地基密实度检测的工程应用。

Study of the relationship between compression wave velocity and physical properties of calcareous sand

The experimental study on the relationship between P-wave velocity and physical parameters of calcareous sand has important theoretical guiding significance and engineering application value for non-destructive testing of calcareous soil foundation and geophysical exploration. By controlling the state of the tested specimens under different conditions, the P-wave velocity was measured to investigate the relationship between the P-wave velocity and physical parameters. Experimental results show that the water content is the main factor that affects the variation of compression wave velocity in a certain density range, and there is a quadratic curve relation between P-wave velocity and water content. Generally, the results of CT scanning show that the larger the particle size, the more abundant inner pores in the particles, which leads to the larger the void ratio and the smaller the P-wave velocity. The P-wave velocity has a negative correlation with particle size and pore ratio. When the density is fixed and uniformity coefficient is different, the compression wave velocity is basically the same in well-graded sand. After compression, a good quadratic relationship is established between P-wave velocity and void ratio under the constant water content. The P-wave velocity is linearly related with soil density. Therefore, the results can be applied to the nondestructive detection of calcareous soil foundation compactness.