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提出了坝基深厚覆盖层密度辨识的基本方法,对大渡河双江口水电站河床覆盖层进行了8孔、106点的现场旁压试验,在对其进行统计分析的基础上建立了威布尔分布模型,依据试验数据对模型的参数进行了最小二乘估计,并对威布尔分布进行了拟合优度检验。依据现场勘查所得的级配曲线,通过20组室内模型试验探讨了旁压模量与模型密度和上覆压力的对应关系,得出了旁压模量与模型密度间服从对数关系的规律。在此基础上对深厚覆盖层的密度进行随机模拟,得到了覆盖层各亚层密度的模拟值,通过与勘探结果的对比,证明了该方法的实用性。
Based on the statistic analysis, we established the Weibull distribution model, which is based on the on-site pressure test of 8 holes and 106 spots in the riverbed cover of Shuangjiangkou Hydropower Station in Dadu River. Based on the experimental data, the parameters of the model were estimated by least square method and the Weibull distribution was tested by goodness-of-fit. According to the grading curve obtained from on-site survey, the corresponding relationship between the compressive modulus and the model density and the overburden pressure was discussed through 20 sets of indoor model tests. The law of obeying the logarithmic relationship between the compressive modulus and the model density was obtained. On this basis, the density of deep overburden layer is simulated stochastically, and the simulation values of the sublayer density of the overburden layer are obtained. The comparison with the exploration results proves the practicability of this method.