膨脹土邊坡淺層破壞穩(wěn)定性分析
發(fā)布時間:2018-07-26 18:42
【摘要】:應(yīng)用南寧膨脹土開展低應(yīng)力下的常規(guī)飽和慢剪、固結(jié)快剪、快剪試驗,獲得了抗剪強度隨豎向應(yīng)力的變化規(guī)律,分析了低應(yīng)力對抗剪強度的影響。進(jìn)行了75、100、200、300kPa豎向壓力下的殘余強度試驗,運用Seep/W和Slope/W軟件,考慮降雨入滲條件,采用M-P、Ordinary和Bishop三種極限平衡法對各抗剪強度下膨脹土邊坡的穩(wěn)定性進(jìn)行對比分析。分析結(jié)果表明:各抗剪強度受低應(yīng)力的影響顯著,均呈非線性,可用冪函數(shù)表達(dá);飽和慢剪強度在低應(yīng)力時最小,高應(yīng)力時最大;采用含低應(yīng)力飽和非線性慢剪強度進(jìn)行邊坡穩(wěn)定分析結(jié)果與實際發(fā)生的淺層破壞吻合。
[Abstract]:In this paper, the conventional saturated slow shear, consolidation fast shear and fast shear tests are carried out on Nanning expansive soil under low stress. The variation of shear strength with vertical stress is obtained, and the influence of low stress on shear strength is analyzed. The residual strength test under vertical pressure of 75100200300kPa was carried out. The stability of expansive soil slope under different shear strength was analyzed by using M-Pordinary and Bishop limit equilibrium method considering rainfall infiltration condition by Seep/W and Slope/W software. The results show that the shear strength is significantly influenced by low stress and is nonlinear and can be expressed by power function, and the saturated slow shear strength is the smallest at low stress and the maximum at high stress. The results of slope stability analysis with low stress saturation nonlinear slow shear strength are in agreement with the actual shallow failure.
【作者單位】: 長沙理工大學(xué)道路災(zāi)變防治及交通安全教育部工程研究中心;
【基金】:國家自然科學(xué)基金項目(50978035,51108049) 交通運輸部科技項目(2009 353 311 060) 道路災(zāi)變防治及交通安全教育部工程研究中心開放基金項目(kfi090303) 廣西交通科技項目(2011-20)
【分類號】:U416.14
[Abstract]:In this paper, the conventional saturated slow shear, consolidation fast shear and fast shear tests are carried out on Nanning expansive soil under low stress. The variation of shear strength with vertical stress is obtained, and the influence of low stress on shear strength is analyzed. The residual strength test under vertical pressure of 75100200300kPa was carried out. The stability of expansive soil slope under different shear strength was analyzed by using M-Pordinary and Bishop limit equilibrium method considering rainfall infiltration condition by Seep/W and Slope/W software. The results show that the shear strength is significantly influenced by low stress and is nonlinear and can be expressed by power function, and the saturated slow shear strength is the smallest at low stress and the maximum at high stress. The results of slope stability analysis with low stress saturation nonlinear slow shear strength are in agreement with the actual shallow failure.
【作者單位】: 長沙理工大學(xué)道路災(zāi)變防治及交通安全教育部工程研究中心;
【基金】:國家自然科學(xué)基金項目(50978035,51108049) 交通運輸部科技項目(2009 353 311 060) 道路災(zāi)變防治及交通安全教育部工程研究中心開放基金項目(kfi090303) 廣西交通科技項目(2011-20)
【分類號】:U416.14
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相關(guān)期刊論文 前10條
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