| 非饱和土强度非线性及对被动土压力的影响 |
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| 引用本文： | 张常光,赵均海,张冬芳.非饱和土强度非线性及对被动土压力的影响[J].广西大学学报(自然科学版),2012(4):797-802. |
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| 作者姓名： | 张常光 赵均海 张冬芳 |
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| 作者单位： | 长安大学建筑工程学院 |
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| 基金项目： | 陕西省自然科学基金资助项目(2011JM7002);陕西省住房和城乡建设厅科学研究项目 |
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| 摘 要： | 为研究非饱和土强度的非线性及其对被动土压力的影响,文中在介绍非饱和土强度非线性研究进展的基础上,结合分段抗剪强度公式拟合了一个高吸力抗剪强度参数,并将这一参数应用于非饱和土被动土压力的计算。研究结果表明:高基质吸力具有双重影响,按减小影响和增大效应间的相对关系可分为3种情况,所对应的被动土压力随着基质吸力的增大,或逐渐减小并最终趋于稳定,或略有增加,或大幅度增加,这实际反映的是高基质吸力下非饱和土强度的非线性规律。
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| 关 键 词： | 非饱和土 高基质吸力 强度非线性 被动土压力 |
Nonlinearity of unsaturated soils strength and its influence on passive earth pressure |
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| ZHANG Chang-guang,ZHAO Jun-hai,ZHANG Dong-fang.Nonlinearity of unsaturated soils strength and its influence on passive earth pressure[J].Journal of Guangxi University(Natural Science Edition),2012(4):797-802. |
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| Authors: | ZHANG Chang-guang ZHAO Jun-hai ZHANG Dong-fang |
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| Institution: | (School of Civil Engineering,Chang’an University,Xi’an 710061,China) |
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| Abstract: | In order to investigate the nonlinearity of unsaturated soil strength and its influence on passive earth pressure,the advances in the study of nonlinearity of unsaturated soil shear strength are reviewed,and based on the piecewise shear strength formula for unsaturated soil,a shear strength parameter under high matric suction is derived.Then,the parameter is applied to the calculation of passive earth pressure of unsaturated soil.The results show that high matric suction has a dual effect which can be divided into three situations according to the relationship between reducing and strengthening.As matric suction increases,the corresponding passive earth pressure decreases gradually and stabilizes,or increases slightly,or increases significantly,which actually reflects the nonlinearity of unsaturated soils strength under high matric suction. |
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| Keywords: | unsaturated soils high matric suction nonlinearity of strength passive earth pressure |
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