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[交流] 学习交流两习题 [复制链接]

1#
                                                                                            °€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
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。°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
(已知:量力环校正系数C=200N/0.01mm,贯入杆直径d=50mm°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
荷载测力计百分表读数R°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
单位压力P(KPa)°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
百分表读数(0.01mm°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
贯入量Lmm°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
0.9°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
(92)°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
60.5°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
(0.61)
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
1.8°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
(183)°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
106.5°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
(1.07)
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
2.9°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
151°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
4.0°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
194°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
4.8°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
240.5°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
5.1°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
286°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
解:根据贯入杆的单位压力计算公式°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
P=C*R/A
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
P=200X0.9/1963=0.092 °€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
MPa°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
0.092X1000=9
KPa°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
P=200X1.8/1963=0.183 MPa°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
0.183X1000=183 (MPa)
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
(
其中 A=1/4Πd2°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
=1/4X3.14X502 =1963
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
请问,贯入量是如何计算的?°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
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°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
σ (KPa)°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
100°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
200°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
300°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
τ( KPa)°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
100°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
108°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
115°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
:°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
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+C°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
(2)
作图如下:°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
3tgΦ=15%200=0.075°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
Φ=4.3
o°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
C=100-100tg
Φ°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
C=92.5(KPa)°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
请问我这样做是正确的吗?那么°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
(3)中的tgΦ=15%200中的15和200是怎样确定的?°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
C=100-100tg
Φ中的两个100是怎样确定的?°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
°€ÒF´5os…8bbs.3c3t.comU‰óVn¥»ã
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