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  • 2010-01-04
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发表于 2010-06-21 14:36 |显示全部
                                                                                            hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
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。hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
(已知：量力环校正系数C=200N/0.01mm,贯入杆直径d=50mmhç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
荷载测力计百分表读数Rhç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
单位压力P(KPa)hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
百分表读数(0.01mmhç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
贯入量Lmmhç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
0.9hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
(92)hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
60.5hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
(0.61)hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
1.8hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
(183)hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
106.5hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
(1.07)hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
2.9hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
（hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
151hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
4.0hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
194hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
4.8hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
240.5hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
5.1hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
286hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
解：根据贯入杆的单位压力计算公式hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
P=C*R/Ahç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
则P=200X0.9/1963=0.092 hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
MPahç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
0.092X1000=9（KPa）hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
P=200X1.8/1963=0.183 MPahç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
0.183X1000=183 (MPa)hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
(其中 A=1/4Πd2hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
=1/4X3.14X502 =1963hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
请问，贯入量是如何计算的？hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
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hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
σ (KPa)hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
100hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
200hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
300hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
τ( KPa)hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
100hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
108hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
115hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
解:hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
（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+Chç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
(2)作图如下：hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
（3）tgΦ=15%200=0.075hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
Φ=4.3ohç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
C=100-100tgΦhç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
C=92.5(KPa)hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
请问我这样做是正确的吗？那么hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
（3）中的tgΦ=15%200中的15和200是怎样确定的？hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
C=100-100tgΦ中的两个100是怎样确定的？hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
hç{¨õñlbbs.3c3t.comvªß®îÇÞ3a’
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