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1、土颗粒分析数据处理(以甲种密度计为例)一、计算小于某粒径试样质量占总试样的百分数：式中 X小于某粒径试样质量百分数（），计算至0.1； md试样干质量（g）；30g, 当试样中易溶盐含量大于0.5时，应洗盐 Cs颗粒密度校正值；从表1查得 mT 悬液温度校正值；从表2查得 CD分散剂校正值； n弯液面校正值； R甲种密度计读数。表1 甲种密度计颗粒密度校正值Cs颗粒密度s（g/cm3）颗粒密度校正值Cs颗粒密度s（g/cm3）颗粒密度校正值Cs2.501.0382.700.9892.521.0322.720.9842.541.0272.740.9812.561.0222.760.9762.58
2、1.0172.780.9732.601.0122.800.9692.621.0072.820.9642.641.0022.840.9612.660.9972.860.9582.680.9932.880.954表2 甲种密度计温度校正值mT悬液温度()温度校正值mT悬液温度()温度校正值mT10.0-2.020.00.010.5-1.920.5+0.111.0-1.921.0+0.311.5-1.821.5+0.512.0-1.822.0+0.612.5-1.722.5+0.813.0-1.623.0+0.913.5-1.523.5+1.114.0-1.424.0+1.314.5-1.324.5
3、+1.515.0-1.225.0+1.715.5-1.125.5+1.916.0-1.026.0+2.116.5-0.926.5+2.217.0-0.827.0+2.517.5-0.727.5+2.618.0-0.528.0+2.918.5-0.428.5+3.119.0-0.329.0+3.319.5-0.129.5+3.530.0+3.7弯液面校正值n将密度计放于20纯水的量筒中，求出弯液面上、下缘读数之差，此值即为弯液面校正值。见图1。图1注意:此例中为乙型密度计 n=0.9994-0.9998=-0.0004分散剂校正值CD1、仪器设备.搅拌器：搅拌杆应高出量筒。.分散剂：4六偏磷酸钠
4、。2、校正步骤.注适量纯水于1L量筒中，再加入用量与试验时相同的4六偏磷酸钠（NaPO3）6溶液，然后用纯水稀释至刻度。.放搅拌器于量筒内上、上搅拌均匀；另取一个1L量筒注纯水至刻度，两者同时放入恒温水槽中使至20恒温。.先将密度计放入纯水量筒中，测记密度计读数；取出密度计再放入加分散剂的量筒中，测记密度计读数，两者读数之差即为分散剂校正值。3、分散剂校正值计算：CD=RD20-R H20式中: CD分散剂校正值；RD20加分散剂溶液密度计读数；R H20纯水中密度计读数。二、计算土粒粒径: 式中 d土粒粒径(mm)，计算至0.001mm； 水的动力黏度（106kPas），查表3； s颗粒密度
5、（g/cm3）； T 时水的密度（g/cm3），查表3； w4 时水的密度（g/cm3）； L某一时间内土粒沉降距离（cm）；根据密度计形状参数和密度计读数计算 t沉降时间（s）。表3 T时，水的动力黏度和密度温度T动力黏度水的密度w温度T动力黏度水的密度w温度T动力黏度水的密度w10-6kPa.sg/cm310-6kPa.sg/cm310-6kPa.sg/cm35.01.5160.99999215.01.1440.99912625.00.8990.9970745.51.49398215.51.13005025.50.8890.9969446.01.47096816.01.1150.99897
6、026.00.8798136.51.44995116.51.10188826.50.8696797.01.42793017.01.08880227.00.8605427.51.40790517.51.07471427.50.8504038.01.38787618.01.06162328.00.8412628.51.36784418.51.04853028.50.8321199.01.34780919.01.03543329.00.8230.9959749.51.32877019.51.02233429.50.81482610.01.31072820.01.01023230.00.8066761
7、0.51.29268220.50.99812830.50.79752411.01.27463321.00.98602131.00.78936911.51.25658021.50.9740.99791131.50.78121312.01.23952522.00.96379932.00.77305412.51.22346622.50.95268532.50.7650.99489413.01.20640423.00.94156733.00.75773113.51.19033923.50.93044833.50.74956614.01.17527124.00.91932734.00.74239914.
8、51.16020024.50.90920134.50.734230以 公式可写成： 表4 粒径计算系数K值温度()颗粒密度（g/cm3）2.52.552.602.652.702.752.802.852.902.953.005.00.13620.13400.13190.12980.12790.12610.12430.12260.12100.11940.11805.50.13510.13290.13090.12880.12690.12510.12330.12170.12000.11850.11706.00.13420.13200.12990.12790.12600.12420.12250.1208
9、0.11920.11770.11626.50.13310.13100.12890.12690.12510.12330.12150.11990.11830.11670.11537.00.13220.13000.12800.12600.12420.12240.12070.11890.11740.11590.11457.50.13120.12900.12700.12510.12320.12140.11970.11810.11650.11500.11368.00.13030.12810.12610.12420.12240.12060.11890.11730.11580.11420.11288.50.1
10、2930.12720.12520.12330.12140.11970.11800.11640.11490.11340.11209.00.12840.12630.12430.12240.12060.11880.11720.11560.11410.11260.11129.50.12740.12540.12340.12150.11970.11800.11630.11470.11320.11180.110410.00.12660.12450.12260.12070.11890.11720.11560.11400.11250.11100.109610.50.12570.12370.12170.11980
11、.11820.11650.11470.11320.11170.11020.108811.00.12480.12280.12090.11900.11730.11560.11400.11240.11090.10950.108111.50.12390.12190.12000.11820.11640.11470.11310.11160.11010.10870.107312.00.12310.12110.11920.11740.11560.11400.11240.11080.10940.10800.106612.50.12230.12060.11840.11660.11500.11330.11160.11010.10870.10730.105913.00.12150.11950.11760.11580.11410.11250.11090.10940.10800.10650.105213.50.12070.11870.11680.11510.11340.11180.11020.10870.10720.10580.104514.00.11990.11790.11610.11430.11260.11100.10940.10790.10650.1051
