巖石的比重、孔隙率

1、.3.2巖石的比重、孔隙率a、巖石比重巖石的比重就是指巖石的干比重除以巖石實體體積(不包括孔隙)，再與4C時水的容重相比，即：WG=式中，Gs巖石比重Ws絕對干燥時體積為V的巖石重力(KN)Vs巖石實體(不包括孔隙)體積(m)Yw在4C時水的容重，Yw=10(KN/m)b、孔隙率巖石內(nèi)孔隙體積與總體積(包括孔隙體積)之比，計算式為：根據(jù)巖石干容重Yd和比重Gs，也可以用下式計算：式中，n孔隙率，以百分數(shù)表示Vv孔隙、裂隙體積(m)V巖樣總體積(m)圖1.3.1b碳酸鹽類巖石的抗壓強度與孔隙率的關(guān)系。010203040J孔隙率nH)碳酸鹽類巖石的抗壓強度與孔隙率之關(guān)系1-大理巖：2大理巖化石灰?guī)r

2、：3茨巖和白云巖圖1.3.1b描述巖體孔隙性的另一個指標(biāo)，孔隙比e。它是巖石孔隙體積與巖石實體體積之比，即：些主要巖石的物理性質(zhì)巖石名稱比重密度(g/cm$)孔隙率（）吸水率（）花崗巖2.502.842.302.800.043.530.21.7花崗閃長巖2.652.651.51.81.51.8閃長巖2.603.102.522.960.253.00.180.40正長巖2.502.902.402.850.471.94輝長巖2.703.202.552.980.293.13流紋斑巖2.622.652.582.510.92.300.140.35UU巖流紋巖2.652.602.65粗面巖2.402.702

3、.302.67漿安山巖2.402.802.302.751.092.19UU巖閃長玢巖2.662.842.492.782.15.10.41.0斑巖2.622.842.202.740.292.75玢巖2.602.902.402.86輝綠巖2.603.102.532.970.406.380.201.0玄武巖2.503.102.533.100.353.00.390.80橄欖巖2.903.402.903.40霏細巖2.662.842.622.781.592.230.180.35響巖2.402.702.402.70火山角礫巖2.503.002.202.90火山碎安山凝灰?guī)r2.682.584.590.55屑

4、巖粗面凝灰?guī)r凝灰質(zhì)熔巖2.872.6425.073.35硅質(zhì)礫巖2.642.772.422.700.404.100.164.40石英礫巖2.672.712.600.349.3鈣質(zhì)膠結(jié)礫巖2.422.66粘土質(zhì)膠結(jié)礫巖2.20沉石英砂巖2.642.772.422.771.049.300.144.10硅質(zhì)膠結(jié)砂巖2.50積泥質(zhì)膠結(jié)砂巖2.602.702.202.605.0020.01.009.00UU巖頁巖2.572.772.302.467.59砂質(zhì)鈣質(zhì)頁巖2.472.602.007.002.306.00灰質(zhì)頁巖2.652.70致密石灰?guī)r2.702.802.602.771.003.50.203.00白云質(zhì)灰?guī)r2.752.702.751.643.220.500.66泥質(zhì)灰?guī)r2.702.752.452.651.003.002.004.00變質(zhì)UU巖片麻巖（新鮮）2.692.822.652.790.702.200.100.70花崗片麻巖（強風(fēng)化）2.302.50石英、角閃石片UU巖2.723.022.682.920.703.000.100.30云母、綠泥石片巖2.752.832.692.760.802.100.100.60硅質(zhì)板巖2.742.812.712.750.303.800.70泥質(zhì)板巖2.682.772.312.752.513.5千枚巖2.812.962.712.86