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在利用动三轴仪或动单剪仪做砂土振动液化或模量试验时,都得先将试样经过各种处理(如浸泡、煮沸、抽气、加反压力,充二氧化碳等措施)使之饱和。尽管如此,试样也不一定能完全达到饱和,因而在试验前都得进行试样饱和度的测定,一般都是通过测定孔隙压力系数B来实现的。当B≈1.0时,认为试样已饱和;当B<1.0,认为试样不饱和,但饱和度S_r数值一般也不知道。此外,孔隙压力系数B因测定程序不同(即固结前测定还是固结后测定)其值亦不相同,一般固结前测定得到的B值较大,固结后测定的B值较小。当对土样进行
When using the dynamic triaxial apparatus or moving single shear instrument to do the liquefaction or modulus test of sand vibration, the sample must first undergo various treatments (such as soaking, boiling, pumping, adding back pressure, and filling carbon dioxide) Saturate it. In spite of this, the sample may not be completely saturated. Therefore, the saturation of the sample must be measured before the test. It is usually achieved by measuring the pore pressure coefficient B. When B≈1.0, the sample is considered saturated; when B<1.0, the sample is considered unsaturated, but the saturation S_r value is generally unknown. In addition, the pore pressure coefficient B is not the same because of different measurement procedures (that is, measured before consolidation or after consolidation). Generally, the B value measured before consolidation is large, and the B value determined after consolidation is small. When doing soil samples