砂土与EPS颗粒混合的轻质土(LSES)细观结构的CT研究

利用医用CT机从定性和定量两个层面研究了砂土与EPS颗粒混合的轻质土（简称为LSES）这种新型土工材料的细观结构，分析了不同水泥掺量（CC）和EPS颗粒含量（Ve/Vs）下LSES不同扫描截面的CT图像以及平均CT数ME值和方差SD.随着CC的增加，ME值增加，LSES的结构更加密实，原生损伤减少，而随着Ve/Vs的增加，水泥水化物C-S-H包裹EPS颗粒表面和填充孔隙的效率都将下降，且Ve/Vs与ME值在本次试验范围内基本呈线性关系。此外，根据SD值在各截面处分布的不均匀性，认为LSES是局部孔隙比分布差异较大的特殊结构性土，CC和Ve/Vs是影响其结构性的主要因素。

Research on meso-structure of lightweight sand-EPSbeads soil (LSES) using CT

A qualitative and quantitative research is conducted on the meso-structure of a novel geo-material-lightweight sand-EPS beads soil (LSES) by a medical CT machine. CT images, average CT value(ME) and SDs for different scanning sections are analyzed under various cement contents(CC) and EPS-bead contents(Ve /Vs). With increasing CC, MEs increase, the structure of LSES become denser, hence the initial damages decrease. whereas when Ve /Vs increases, C-S-H has lower efficiency to coat EPS beads and infill the voids between particles; and Ve /Vs is linear to the MEs in this test. Additionally, due to different SD distribution for sections, LSES is defined as a special structural soil with highly different local void ratio distributions; and CC and Ve /Vs are the major factors influencing its structure.