【摘要】：土體強(qiáng)度參數(shù)變異系數(shù)V及其變化范圍較大,變異水平傳統(tǒng)上以經(jīng)驗(yàn)劃分為主,未考慮與可靠指標(biāo)非線性響應(yīng)特征的關(guān)聯(lián)性。根據(jù)收集得到的257組細(xì)粒土強(qiáng)度參數(shù)變異系數(shù)數(shù)據(jù),采用A-D檢驗(yàn)進(jìn)行概率分布形式判定、特征參數(shù)擬合及置信區(qū)間估計(jì);基于Monte Carlo模擬分析土體強(qiáng)度參數(shù)變異系數(shù)與邊坡穩(wěn)定可靠指標(biāo)β的非線性映射關(guān)系,開展與可靠指標(biāo)變化特征相適應(yīng)的土體強(qiáng)度參數(shù)變異類型劃分研究。計(jì)算表明:黏性土強(qiáng)度參數(shù)變異系數(shù)(V_c,V_φ)呈對(duì)數(shù)正態(tài)分布,95%保證率分布區(qū)間V_c∈[0.05,0.73]和V_φ∈[0.05,0.47],黃土則服從正態(tài)分布,V_c∈[0.05,0.81]和V_φ∈[0.05,0.39];隨強(qiáng)度參數(shù)變異程度逐漸增大,可靠指標(biāo)依次表現(xiàn)出非線性減小、線性降低和微量變化三類響應(yīng)特征,據(jù)此提出急變、緩變和滯鈍三類強(qiáng)度參數(shù)變異類別,其中V_c≤0.35,0.35分別為急變型和緩變型,V_φ≤0.20,0.20~0.35,≥0.35為急變、緩變和滯鈍型。
[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，

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