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目前国内外测定岩样孔隙度的常规方法有干法(气体法)和湿法(煤油法),用以测量岩石的骨架体积或孔隙体积,并进一步计算岩石的孔隙度。本文所介绍的用吊称法测孔隙度的基本依据是阿基米德原理。通过分别测量岩样在空气中和煤油中的重量,用其差值求岩样的骨架体积和总体积,从而计算出孔隙度。实验表明这种方法的精确度比煤油法高。一、基本公式边长为L厘米的立方体岩样,吊在煤油中(见图1)。岩样底面所受的液柱压力为F_1: F_1=L~2(h+L)γ_煤 (1) 岩样顶面受的液柱压力为F_2
At present, the conventional methods to determine the porosity of rock samples are dry method (gas method) and wet method (kerosene method), which are used to measure the skeleton volume or pore volume of rock and further calculate the porosity of rock. In this paper, the basic basis for measuring porosity by hanging scales is the Archimedes principle. The porosity was calculated by separately measuring the weight of rock samples in air and kerosene and using their differences to find the skeleton volume and total volume of rock samples. Experiments show that this method is more accurate than the kerosene method. First, the basic formula Cube side length of L cm, hanging in kerosene (see Figure 1). The liquid column pressure on the bottom of the rock sample is F_1: F_1 = L ~ 2 (h + L) γ_coal (1) The pressure on the top of the rock sample is F_2