【摘要】 变容压力脉冲法是一种快速(t50<2.5h)、宽幅(10-7～10-1D,1D=1×10-3cm/s)、高精度(偏差<5%)的渗透系数测量新方法,介绍这种方法的理论特点、装置设计原则和试验操作过程。探讨采用该方法及其装置渗透系数测量的13种误差源,包括装置的、客观的和人为的误差源,总结为6种误差因素。通过采用ANSYS有限元软件中渗流模块瞬态脉冲法模拟分析变容脉冲法渗透系数测量的试验过程,重点分析这6种误差因素对渗透系数测量所造成的误差影响。最后讨论装置设计、制作和实际操作过程中应注意的问题,提出减少误差因素和降低误差影响的方法和应对措施,有助于进一步改进试验装置,优化试验操作,提高试验精度。更多还原

【Abstract】 Storage-variable transient pulse method is an advanced permeability measurement method for its properties of fast operation(testing time less than 2.5 h),large range(testing range from 10-7 D to 10-1 D) and high precision(testing error less than 5%).First of all,the theoretical features,design principles and testing processes of this new method have been introduced.And then,the methodological and technological error sources have been discussed,including the device attached,the surroundings influenced and man-made produced.All the error sources have been classified to 6 kinds of error factors which have a great impact on measurement testing.The impactions have been analyzed categorically and systematically by using ANSYS modelling.The last but not the end,matters needing attention during design,manufacture and operation have been discussed,moreover,useful ways and means which can cancel error factors or reduce error effects have been proposed.As a result,the device will be improved,and the testing will be rather rational,and the precision will be furthermore accurate.更多还原