这些颗粒的大小变化范围，从粗粉砂级到砂级或细砂级。
这些颗粒的大小变化范围是从粗粉砂级到砂级或细砂级。
These particles range from coarse silt to sand or pebble size.
颗粒大小、级配及水质条件与土的力学性质密切相关，水位的存在使地基具有上硬下软的双元结构特点，与相对密度相同的石英砂地基相比，其沉降变形要小几十倍。
Double-Layer structure in subsoils is caused by water level and the settlements of subsoils are several dozen 'times smaller than those of quartz sands for 3rd band buildings.
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