孔隙水压力量测的延迟效应分析

从理论上考虑，用压力传感器量测土中变化的孔隙水压力会存在延迟效应，本文阐明了延迟效应的机理，并以饱和土孔压消散试验为例进行了深入的分析，研究表明，延迟效应的主要影响因素是体积压缩系数和传感器敏感元件的刚度因数，从计算结果看出，除硬粘性土外，延迟效应对孔压量测结果影响甚小。

An Analysis on the Delay Effect in Pore Water Pressure Measurement

Based on theoretical consideration, the delay effect would exist if pore water pressure is measured by use of pressure transducers. The mechanism of the delay effect is explained in this paper, and as anstudied example, an analytical solution of pore pressure dissipation in the standard dissipation test forsaturated soils is presented. The research result shows that the main influence factors are the volumetriccompression coeffecient of soil and the stiffness factor of transducer. It can be seen from the analytical resultsthat the influence of the delay effect on the measurement results of pore psessure are small for many cases except for stiff clayey soil.