巖石的比重、孔隙率

1、.3.2巖石的比重、孔隙率宇文皓月a、巖石比重再與4C時(shí)巖石的比重就是指巖石的干比重除以巖石實(shí)體體積（不包含孔隙），水的容重相比，即：式中，Gs一巖石比重Wo絕對(duì)干燥時(shí)體積為V的巖石重力（KN）vs-巖石實(shí)體（不包含孔隙）體積（mi）Tw一在4C時(shí)水的容重，Tw=10（KN/mI）b、孔隙率巖石內(nèi)孔隙體積與總體積（包含孔隙體積）之比，計(jì)算式為:9=0x100%y根據(jù)巖石干容重Yd和比重GS,也可以用下式計(jì)算：=（1-J-）xl00%式中，n一孔隙率，以白分?jǐn)?shù)暗示Vv一孔隙、裂隙體積（甫）V-巖樣總體積（應(yīng)_1）圖1.3.1b碳酸鹽類巖石的抗壓強(qiáng)度與孔隙率的關(guān)系孔隙率-(%)碳酸鹽類巖石的抗壓強(qiáng)

2、度與孑L隙率之關(guān)系1一大理巖2大理巖化石灰?guī)r：3石灰?guī)r和白云巖圖1.3.1b描述巖體孔隙性的另一個(gè)指標(biāo)，孔隙比e。它是巖石孔隙體積與巖石實(shí)體體積之比，即：一些主要巖石的物理性質(zhì)巖石名稱比重密度(g/c應(yīng))孔隙率(%)吸水率(%)漿巖花崗巖2.502.842.302.800.043.530.21.7化岡閃長(zhǎng)石2.652.651.51.81.51.8閃長(zhǎng)巖2.603.102.522.960.253.00.180.40正長(zhǎng)巖2.502.902.402.850.471.94輝長(zhǎng)巖2.703.202.552.980.293.13流紋斑巖2.622.652.582.510.92.300.140.35流紋巖

3、2.652.602.65粗面巖2.402.702.302.67安山巖2.402.802.302.751.092.19閃長(zhǎng)玲石2.662.842.492.782.15.10.41.0斑巖2.622.842.202.740.292.75玲巖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(xì)巖2.662.842.622.781.592.230.180.35響巖2.402.702.402.70火山碎屑巖火山角礫巖2.503.002.202.90

4、安山凝灰?guī)r2.682.584.590.55粗面凝灰?guī)r25.07凝灰質(zhì)熔巖2.872.643.35機(jī)積巖硅質(zhì)礫石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)礫石2.20右英砂巖2.642.772.422.771.049.300.144.10硅質(zhì)膠結(jié)砂巖2.50泥質(zhì)膠結(jié)砂巖2.602.702.202.605.0020.01.009.00貞巖2.572.772.302.467.59砂質(zhì)鈣質(zhì)貞巖2.472.602.007.002.306.00灰質(zhì)貞巖2.652.70致密石灰?guī)r2.702.802.60

5、2.771.003.50.203.00白方質(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)片麻巖（新鮮）2.692.822.652.790.702.200.100.70花崗片麻巖（強(qiáng)風(fēng)化）2.302.50右英、角閃右片2.723.022.682.920.703.000.100.30云母、綠泥石片2.752.832.692.760.802.100.100.60硅質(zhì)板石2.742.812.712.750.303.800.70泥質(zhì)板巖2.682.772.312.752.513.5千枚巖2.812.962.712.860