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  • 2010-01-04
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发表于 2010-06-21 14:36 |只看楼主
                                                                                            º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
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。º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
(已知：量力环校正系数C=200N/0.01mm,贯入杆直径d=50mmº·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
荷载测力计百分表读数Rº·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
单位压力P(KPa)º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
百分表读数(0.01mmº·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
贯入量Lmmº·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
0.9º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
(92)º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
60.5º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
(0.61)º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
1.8º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
(183)º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
106.5º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
(1.07)º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
2.9º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
（º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
151º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
4.0º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
194º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
4.8º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
240.5º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
5.1º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
286º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
解：根据贯入杆的单位压力计算公式º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
P=C*R/Aº·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
则P=200X0.9/1963=0.092 º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
MPaº·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
0.092X1000=9（KPa）º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
P=200X1.8/1963=0.183 MPaº·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
0.183X1000=183 (MPa)º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
(其中 A=1/4Πd2º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
=1/4X3.14X502 =1963º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
请问，贯入量是如何计算的？º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
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º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
σ (KPa)º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
100º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
200º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
300º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
τ( KPa)º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
100º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
108º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
115º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
解:º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
（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+Cº·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
(2)作图如下：º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
（3）tgΦ=15%200=0.075º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
Φ=4.3oº·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
C=100-100tgΦº·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
C=92.5(KPa)º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
请问我这样做是正确的吗？那么º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
（3）中的tgΦ=15%200中的15和200是怎样确定的？º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
C=100-100tgΦ中的两个100是怎样确定的？º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
º·½Îª{·Áœbbs.3c3t.com¼O­×Q3ˆ=
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