黄草坪二号隧道岩石物理力学性质试验成果统计分析表（二）地层岩石名称状态特征统计项目子样数N标准差S变异系数Cv保证率α系数ta/子样极大值子样微小值算术平均值标准差平均值保证率平均值推荐值备 注组段代号大值小值大值小值寒武系中下统下段∈1-2a片岩弱 风 化至 未 风化天然密度（g/cm3）150.038690.013940.950.45472.842.722.782.822.742.802.762.78烘干密度（g/cm3）150.030630.011120.950.45472.802.712.752.782.722.762.742.75比重52.862.752.802.80普通吸水率（%）150.18530.25740.950.45471.220.510.720.910.530.800.640.72饱和吸水率（%）150.17270.21700.950.45471.240.600.800.970.630.880.720.80弹性模量（GPa）1510.16860.46620.950.454737.96.3921.8131.9811.6426.4317.1917.19泊松比50.270.240.260.26风干抗压强度（MPa）146.39810.15760.950.473351.627.540.647.034.243.637.637.6饱和抗压强度（MPa）156.95260.26640.950.454738.814.8426.0933.0419.1429.2522.9322.93风干抗拉强度（MPa）151.85220.43840.950.45476.50.754.236.082.385.073.393.39湿抗拉强度（MPa）90.61030.14810.950.625.153.404.124.733.514.503.743.74岩块纵波速度（m/s）15183.53120.037280.950.454752004520492351074739500648405006软化系数50.720.530.650.65抗剪断内聚力 C′（kPa）51100610864864抗剪断内摩擦角 φ′(kPa）54938.544.344.3抗剪内聚力 C（kPa）5405100235235抗剪内摩擦角 φ(kPa）5403235.735.7
