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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：X 二 100C （R + m + n-C ）m sTDd式中X小于某粒径试样质量百分数（），计算至0.1%；m试样干质量（g）； 30g,当试样中易溶盐含量大于0.5%时，应洗盐dC颗粒密度校正值；从表1查得smT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 Css颗粒密度Ps(g/cm3)颗粒密度校正值C颗粒密度PS(g/cm3)颗粒密度校正值C2.501.0382.700.9892.521.0322.720.9842.541.0272.740
2、.9812.561.0222.760.9762.581.0172.780.9732.601.0122.800.9692.621.0072.820.9642.641.0022.840.9612.660.9972.860.9582.680.9932.880.954表 2甲种密度计温度校正值 mT悬液温度温度校正值悬液温度温度校正值(C)m(C)m10.0-2.020.00.010.5-1.920.5+0.111.0-1.921.0+0.311.51.821.5+0.512.01.822.0+0.612.5-1.722.5+0.813.0-1.623.0+0.913.5-1.523.5+1.114.
3、0-1.424.0+1.314.5-1.324.5+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20C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
4、设备 搅拌器：搅拌杆应高出量筒。 分散剂：4%六偏磷酸钠。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（NaPO ）36 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20C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：C=R -RD D20 H20式中：CD分散剂校正值；RD20加分散剂溶液密度计读数；R 纯水中密度计读数。H20、计算土粒粒径:z I 18 X 104n- L
5、7 |Td 二二 k、_|(P s P wT)9.81 -1” t Pw式中d土粒粒径(mm)，计算至0.001mm；n 水的动力黏度(=10-6kPas),查表3；swT-颗粒密度(g/cm3)；T C时水的密度(g/cm3),查表3；-4 C时水的密度(g/cm3)；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 TC时，水的动力黏度和密度温度T动力黏度n水的密度P温度T动力黏度n水的密度P温度T动力黏度n水的密度PV 106Pa swg/cm3X 10-6kPa swg/cm3X 10-6kPa swg/cm35.0丄 U丄、JL vl *1.5
6、160.99999215.01.1440.99912625.00.8990.9970745.51.49398215.51.13005025.50.8890.9969446.01.47096816.01.1150.99897026.00.8798136.51.44995116.51.10188826.50.8696797.01.42793017.01.08880227.00.8605427.51.40790517.51.07471427.50.8504038.01.38787618.01.06162328.00.8412628.51.36784418.51.04853028.50.8321199
7、.01.34780919.01.03543329.00.8230.9959749.51.32877019.51.02233429.50.81482610.01.31072820.01.01023230.00.80667610.51.29268220.50.99812830.50.79752411.01.27463321.00.98602131.00.78936911.51.25658021.50.9740.99791131.50.78121312.01.23952522.00.96379932.00.77305412.51.22346622.50.95268532.50.7650.994894
8、13.01.20640423.00.94156733.00.75773113.51.19033923.50.93044833.50.74956614.01.17527124.00.91932734.00.74239914.51.16020024.50.90920134.50.734230L 以k二18 X 104n公式可写成：d=K订p - pZ：( l 存.81P温度颗粒密度（g/cm3）(-C)2.52.552.602.652. 702. 752.802.855.00.13620. 13400.13190. 12980.12790. 12610.12430.12265.50.13510.
9、13290.13090. 12880.12690. 12510.12330.12176.00.13420. 13200.12990. 12790.12600.12420.12250.12086.50.13310.13100.12890. 12690.12510. 12330.12150.11997.00.13220.13000.12800.12600.12420.12240.12070.11897.50.13120. 12900.12700. 12510.12320. 12140.11970.11818.00.13030.12810.12610.12420.12240.12060.11890.
10、11738.50.12930. 12720.12520. 12330.12140.11970.11800.11649.00.12840. 12630.12430.12240.12060.11880.11720.11569.50.12740.12540.12340. 12150.11970.11800.11630.11471000.12660. 12450.12260.12070.11890.11720.11560.11401050.12570. 12370.12170.11980.11820.11650.11470.113211.00.12480.12280.12090. 11900.1173
11、0.11560.11400.112411.50.12390.12190.12000.11820.11640.11470.11310.111612.00.12310.12110.11920. 11740.11560. 11400.11240.110812.50.12230. 12060.11840.11660.11500.11330.11160.110113.00.12150.11950.11760.11580.11410.11250.11090.109413.50.12070.11870.11680.11510.11340.11180.11020.108714.00.11990.11790.1
12、1610.11430.11260.11100.10940.107914.50.11910.11720.11530.11350.11180.11020.10870.107215.00.11830.11640.11460.11280.11120.10960.10800.106515.50.11750.11560.11380.11210.11030.10870.10730.105816.00.11680.11490.11310.11140.10970.10820.10660.105216.50.11610.11420.11240. 11070.10910.10750.10600.104517.00.11530.11340.11170.11000.10840.1
