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)3.85õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
4.01õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
3.53õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
3.96õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
4.00õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
3.73õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
3.86õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
3.97õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
3.93õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
4.05õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
3.52õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
3.83õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
第一种解答:õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
R=3.85õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
Cv=0.046õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
Rd/(1-ZaCv)=3.1/(1-1.645*0.046)=3.35õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
R>Rd/(1-ZaCv)õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
合格,得满分20分。õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
我看了也有资料上这样解答: õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
答案:õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
(1)计算平均值õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
,标准偏差S、变异系数Cv:R=3.85õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
Cv=0.046 S=0.178õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
(2)计算代表值:õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
保证率为95%的保证率系数Za=1.645õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
∴代表值=3.85-0.178*1.645=3.56õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
(3)评定:õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
∵3.56>3.2õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
∴该段的无侧限抗压强度合格õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
(4)计算得分值:õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
得分值=20分(规定的满分)õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
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!õéHÐ:Gbbs.3c3t.com»£ÒþÞÅÿ
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