问题：
[问答题]试从基本概念、计算公式及适用条件等方面比较压缩模量、变形模量与弹性模量，它们与材料力学中杨氏模量有什么区别？
参考答案：
土的压缩模量Ε<sub>5</sub>的定义是土在侧限条件下的竖向附加应力与竖向应变之比值。
土的压缩模量是通过土的室内压缩试验得到的，
。
土的变形模量Ε<sub>0</sub>的定义是土体在无侧限条件下的应力与应变的比值。
土的变形模量时现场原位试验得到的，
土的压缩模量和变形模量理论上是可以换算的：
。但影响因素较多不能准确反映他们之间的实际关系。
土的弹性模量Ε的定义是土体在无侧限条件下瞬时压缩的应力应变模量。
土的弹性模量由室内三轴压缩试验确定。
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