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1#
                                                                                            þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
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CBR2.5CBR5P判断该试验是否重做。þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
(已知:量力环校正系数C=200N/0.01mm,贯入杆直径d=50mmþ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
荷载测力计百分表读数Rþ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
单位压力P(KPa)þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
百分表读数(0.01mmþ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
贯入量Lmmþ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
0.9þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
(92)þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
60.5þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
(0.61)
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
1.8þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
(183)þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
106.5þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
(1.07)
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
2.9þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
151þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
4.0þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
194þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
4.8þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
240.5þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
5.1þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
286þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
解:根据贯入杆的单位压力计算公式þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
P=C*R/A
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
P=200X0.9/1963=0.092 þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
MPaþ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
0.092X1000=9
KPaþ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
P=200X1.8/1963=0.183 MPaþ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
0.183X1000=183 (MPa)
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
(
其中 A=1/4Πd2þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
=1/4X3.14X502 =1963
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
请问,贯入量是如何计算的?þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
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þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
σ (KPa)þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
100þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
200þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
300þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
τ( KPa)þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
100þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
108þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
115þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
:þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
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+Cþ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
(2)
作图如下:þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
3tgΦ=15%200=0.075þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
Φ=4.3
oþ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
C=100-100tg
Φþ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
C=92.5(KPa)þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
请问我这样做是正确的吗?那么þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
(3)中的tgΦ=15%200中的15和200是怎样确定的?þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
C=100-100tg
Φ中的两个100是怎样确定的?þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
þ£Qº¨5¢qç/bbs.3c3t.com ÂlµóÓ¥ÿžÔ
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