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  • 2010-01-04
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发表于 2010-06-21 14:36 |只看楼主
                                                                                            œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
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。œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
(已知：量力环校正系数C=200N/0.01mm,贯入杆直径d=50mmœÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
荷载测力计百分表读数RœÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
单位压力P(KPa)œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
百分表读数(0.01mmœÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
贯入量LmmœÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
0.9œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
(92)œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
60.5œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
(0.61)œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
1.8œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
(183)œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
106.5œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
(1.07)œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
2.9œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
（œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
151œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
4.0œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
194œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
4.8œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
240.5œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
5.1œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
286œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
解：根据贯入杆的单位压力计算公式œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
P=C*R/AœÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
则P=200X0.9/1963=0.092 œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
MPaœÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
0.092X1000=9（KPa）œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
P=200X1.8/1963=0.183 MPaœÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
0.183X1000=183 (MPa)œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
(其中 A=1/4Πd2œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
=1/4X3.14X502 =1963œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
请问，贯入量是如何计算的？œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
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œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
σ (KPa)œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
100œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
200œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
300œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
τ( KPa)œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
100œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
108œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
115œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
解:œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
（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+CœÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
(2)作图如下：œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
（3）tgΦ=15%200=0.075œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
Φ=4.3oœÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
C=100-100tg֜Ûtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
C=92.5(KPa)œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
请问我这样做是正确的吗？那么œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
（3）中的tgΦ=15%200中的15和200是怎样确定的？œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
C=100-100tgΦ中的两个100是怎样确定的？œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
œÛtj’ÖTbbs.3c3t.comrØÙ°¹Ó½üy.
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