基于可靠指标的土体强度参数变异特征及类型划分
发布时间：2018-08-01 12:42
【摘要】：土体强度参数变异系数V及其变化范围较大,变异水平传统上以经验划分为主,未考虑与可靠指标非线性响应特征的关联性。根据收集得到的257组细粒土强度参数变异系数数据,采用A-D检验进行概率分布形式判定、特征参数拟合及置信区间估计;基于Monte Carlo模拟分析土体强度参数变异系数与边坡稳定可靠指标β的非线性映射关系,开展与可靠指标变化特征相适应的土体强度参数变异类型划分研究。计算表明:黏性土强度参数变异系数(V_c,V_φ)呈对数正态分布,95%保证率分布区间V_c∈[0.05,0.73]和V_φ∈[0.05,0.47],黄土则服从正态分布,V_c∈[0.05,0.81]和V_φ∈[0.05,0.39];随强度参数变异程度逐渐增大,可靠指标依次表现出非线性减小、线性降低和微量变化三类响应特征,据此提出急变、缓变和滞钝三类强度参数变异类别,其中V_c≤0.35,0.35分别为急变型和缓变型,V_φ≤0.20,0.20~0.35,≥0.35为急变、缓变和滞钝型。
[Abstract]:The coefficient of variation of soil strength parameter V and its variation range are large, and the variation level is traditionally divided mainly by experience without considering the correlation with the nonlinear response characteristics of reliability index. According to 257 sets of variation coefficient data of fine grained soil strength parameters, A-D test is used to determine probability distribution form, characteristic parameter fitting and confidence interval estimation. Based on Monte Carlo simulation, the nonlinear mapping relationship between soil strength parameter variation coefficient and slope stability reliability index 尾 is analyzed, and the classification of soil strength parameter variation type suitable for reliability index variation characteristic is studied. The calculation results show that the coefficient of variation of strength parameters of clay soil (VCX V _ 蠁) is a logarithmic normal distribution of 95% guarantee rate distribution between V _ c 鈭，
本文编号：2157617
[Abstract]:The coefficient of variation of soil strength parameter V and its variation range are large, and the variation level is traditionally divided mainly by experience without considering the correlation with the nonlinear response characteristics of reliability index. According to 257 sets of variation coefficient data of fine grained soil strength parameters, A-D test is used to determine probability distribution form, characteristic parameter fitting and confidence interval estimation. Based on Monte Carlo simulation, the nonlinear mapping relationship between soil strength parameter variation coefficient and slope stability reliability index 尾 is analyzed, and the classification of soil strength parameter variation type suitable for reliability index variation characteristic is studied. The calculation results show that the coefficient of variation of strength parameters of clay soil (VCX V _ 蠁) is a logarithmic normal distribution of 95% guarantee rate distribution between V _ c 鈭，
本文编号：2157617
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