如题:某高速公路水泥稳定碎石基层,已知设计抗压强度Rd=3.1MPa,现测得某段的无侧限抗压强度数值如下,对该段强度结果进行评定并计算其得分值。(规定分为20分,保证率为95%,Za=1.645)3.85å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
4.01å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
3.53å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
3.96å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
4.00å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
3.73å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
3.86å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
3.97å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
3.93å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
4.05å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
3.52å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
3.83å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
第一种解答:å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
R=3.85å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
Cv=0.046å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
Rd/(1-ZaCv)=3.1/(1-1.645*0.046)=3.35å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
R>Rd/(1-ZaCv)å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
合格,得满分20分。å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
我看了也有资料上这样解答: å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
答案:å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
(1)计算平均值å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
,标准偏差S、变异系数Cv:R=3.85å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
Cv=0.046 S=0.178å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
(2)计算代表值:å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
保证率为95%的保证率系数Za=1.645å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
∴代表值=3.85-0.178*1.645=3.56å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
(3)评定:å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
∵3.56>3.2å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
∴该段的无侧限抗压强度合格å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
(4)计算得分值:å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
得分值=20分(规定的满分)å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
个人认为第二种解答求出的是该组数据的代表值,不适用于路段的强度评定,不知大家有何不同见解,欢迎讨论!å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9
å©H)ZçõPpêbbs.3c3t.comkRÑQø9cE9