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                                                                                            øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
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。øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
(已知:量力环校正系数C=200N/0.01mm,贯入杆直径d=50mmøèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
荷载测力计百分表读数Røèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
单位压力P(KPa)øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
百分表读数(0.01mmøèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
贯入量Lmmøèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
0.9øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
(92)øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
60.5øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
(0.61)
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
1.8øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
(183)øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
106.5øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
(1.07)
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
2.9øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
151øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
4.0øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
194øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
4.8øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
240.5øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
5.1øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
286øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
解:根据贯入杆的单位压力计算公式øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
P=C*R/A
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
P=200X0.9/1963=0.092 øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
MPaøèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
0.092X1000=9
KPaøèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
P=200X1.8/1963=0.183 MPaøèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
0.183X1000=183 (MPa)
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
(
其中 A=1/4Πd2øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
=1/4X3.14X502 =1963
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
请问,贯入量是如何计算的?øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
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øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
σ (KPa)øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
100øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
200øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
300øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
τ( KPa)øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
100øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
108øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
115øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
:øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
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+Cøèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
(2)
作图如下:øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
3tgΦ=15%200=0.075øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
Φ=4.3
oøèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
C=100-100tg
Φøèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
C=92.5(KPa)øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
请问我这样做是正确的吗?那么øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
(3)中的tgΦ=15%200中的15和200是怎样确定的?øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
C=100-100tg
Φ中的两个100是怎样确定的?øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
øèñ¾Û™[Áïbbs.3c3t.com¶×ËjvÁÎ
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