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  • 2010-01-04
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发表于 2010-06-21 14:36 |只看楼主
                                                                                            eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
2下列表格中的数据为做CBR试验十所测得的结果，请将所需数据填在表格空白处，并计算CBR2.5和CBR5，P判断该试验是否重做。eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
(已知：量力环校正系数C=200N/0.01mm,贯入杆直径d=50mmeb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
荷载测力计百分表读数Reb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
单位压力P(KPa)eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
百分表读数(0.01mmeb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
贯入量Lmmeb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
0.9eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
(92)eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
60.5eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
(0.61)eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
1.8eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
(183)eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
106.5eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
(1.07)eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
2.9eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
（eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
151eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
4.0eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
194eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
4.8eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
240.5eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
5.1eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
286eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
解：根据贯入杆的单位压力计算公式eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
P=C*R/Aeb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
则P=200X0.9/1963=0.092 eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
MPaeb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
0.092X1000=9（KPa）eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
P=200X1.8/1963=0.183 MPaeb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
0.183X1000=183 (MPa)eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
(其中 A=1/4Πd2eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
=1/4X3.14X502 =1963eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
请问，贯入量是如何计算的？eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
1 某工地地基原状土直剪试验（快剪）结果如下表，试求该地基的强度指标eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
σ (KPa)eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
100eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
200eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
300eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
τ( KPa)eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
100eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
108eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
115eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
解:eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
（1）直剪试验在直角坐标σ~τ关系图是线性的，表达式是τ =σtgΦ+Ceb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
(2)作图如下：eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
（3）tgΦ=15%200=0.075eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
Φ=4.3oeb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
C=100-100tgΦeb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
C=92.5(KPa)eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
请问我这样做是正确的吗？那么eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
（3）中的tgΦ=15%200中的15和200是怎样确定的？eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
C=100-100tgΦ中的两个100是怎样确定的？eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
eb°d "WŽbbs.3c3t.comýÄ;ºàÂøÀc
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