由于考虑了围压对岩石刚度有提高的影响，非线性计算结果更安全一些，但这不足以弥补砾岩因泡水降低弹模带来的影响。
The calculation result is safer by considering the improvement of rock rigidity under confining pressure, but the improvement can not make up the loss of rock rigidity caused by immersion.
试验发现，初始弹模与围压呈较好的线性关系。
The test results show that there is a linear relationship between confining pressures and initial tangent modulus.
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