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摘要: 在对某公路隧道喷射混凝土进行现场钻孔取芯和室内抗压强度试验的基础上, 用χ2检验法对收集的喷射混凝土抗压强度值分别选取正态分布、对数正态分布和极值Ⅰ型分布进行拟合检验, 分析了喷射混凝土抗压强度的概率统计规律, 并利用所得规律对其统计标准值进行了计算。计算结果表明, C25喷射混凝土抗压强度的概型分布符合正态分布, 抗压强度的标准差为6.91~7.15 MPa, 变异系数为0. 24~0.26, 与C25模筑混凝土抗压强度的标准差5.43 MPa、变异系数0.16相比, 喷射混凝土抗压强度施工的均质性差, 离散性大; C25喷射混凝土抗压强度统计标准值为16~18 MPa, 与C25模筑混凝土抗压强度统计标准值17 MPa比较接近。Abstract: In order to analyzing the distributation rule of shotcrete-strength, the expenimental data of shotcrete-strength were studied by Normal distribuation, logarithm Normal distributation and extremum Ⅰ distributation, the distributations were examined by χ2 mothed, statistical standard values were calculated by the rule. Computation result shows that the C25 shotcrete-strength distribution submits Normal distribution, C25 shotcrete-strength's standard deviation is 6.91~7.15 MPa, its variation coefficient is 0.24~0.26, C25 moulded concrete strength's standard deviation is 5.43 MPa, its variation coefficient is 0.16, the homogeneity of shotcrete-strength construction is worse, the divergence index of shotcrete-strength is larger, the standard value of shotcrete-strength is 16~18 MPa, it is near to the strength 17 MPa of moulded concrete.
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Key words:
- tunnel engineering /
- shotcrete-strength /
- probability statistics /
- reliability /
- statistics rule
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表 1 混凝土强度换算系数
Table 1. Conversion Factor of Concrete Strength
高径比 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 换算系数 1.00 1.04 1.07 1.10 1.13 1.15 1.17 1.19 1.21 1.22 1.24 表 2 组数与组距
Table 2. Number and Distance
隧道 最小值/MPa 最大值/MPa 组数 组距/MPa 东线 10.0 51.8 20 2.2 西线 11.7 59.2 20 2.5 表 3 检验结果
Table 3. Checked Result
分布假设 正态分布 对数正态分布 极值Ⅰ型分布 测点 东线(621) 西线(642) 东线(621) 西线(642) 东线(621) 西线(642) χ2 5.337 18.157 33.047 60.408 67.042 99.225 χα2 (k-r-1) 21.026 19.675 21.026 18.307 19.675 21.026 检验结果 接受 接受 拒绝 拒绝 拒绝 拒绝 注: α为0.05, k表示组数, r表示假设分布的自由度。 表 4 统计参数
Table 4. Statistical Parameters
位置 样本数量 平均值/MPa 标准差/MPa 变异系数 标准值/MPa 东线隧道 621 28.0 7.15 0.26 16 西线隧道 642 29.4 6.91 0.24 18 -
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