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  • 2010-01-04
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发表于 2010-06-21 14:36 |只看楼主
                                                                                            zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
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。zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
(已知：量力环校正系数C=200N/0.01mm,贯入杆直径d=50mmzG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
荷载测力计百分表读数RzG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
单位压力P(KPa)zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
百分表读数(0.01mmzG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
贯入量LmmzG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
0.9zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
(92)zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
60.5zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
(0.61)zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
1.8zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
(183)zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
106.5zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
(1.07)zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
2.9zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
（zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
151zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
4.0zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
194zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
4.8zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
240.5zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
5.1zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
286zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
解：根据贯入杆的单位压力计算公式zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
P=C*R/AzG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
则P=200X0.9/1963=0.092 zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
MPazG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
0.092X1000=9（KPa）zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
P=200X1.8/1963=0.183 MPazG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
0.183X1000=183 (MPa)zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
(其中 A=1/4Πd2zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
=1/4X3.14X502 =1963zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
请问，贯入量是如何计算的？zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
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zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
σ (KPa)zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
100zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
200zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
300zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
τ( KPa)zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
100zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
108zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
115zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
解:zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
（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+CzG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
(2)作图如下：zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
（3）tgΦ=15%200=0.075zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
Φ=4.3ozG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
C=100-100tgΦzG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
C=92.5(KPa)zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
请问我这样做是正确的吗？那么zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
（3）中的tgΦ=15%200中的15和200是怎样确定的？zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
C=100-100tgΦ中的两个100是怎样确定的？zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
zG¨¹ZKjˏbbs.3c3t.comÔåœß2ý ¶’Î
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