| 吸水强度衰减条件下散体滑坡的稳定性演变分析 |
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| 引用本文： | 陈涛,唐红梅. 吸水强度衰减条件下散体滑坡的稳定性演变分析[J]. 重庆交通大学学报(自然科学版), 2008, 27(6): 1103-1107 |
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| 作者姓名： | 陈涛 唐红梅 |
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| 作者单位： | 重庆交通大学,岩土工程研究所,重庆,400074;重庆交通大学,岩土工程研究所,重庆,400074 |
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| 基金项目： | 国家自然科学基金 ， 重庆市自然科学基金 |
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| 摘 要： | 土体吸水蠕变强度衰减是散体滑坡演绎启动的根本原因,以巫山冯家坝滑坡为例,由室内试验得到不同饱和度下松散土体的物理力学参数,应用大型有限元数值模拟软件ANSYS,研究了降雨条件下散体滑坡的演变趋势。分析表明,滑坡的最大位移发生在滑坡体后缘,且随松散土体饱和度的增大呈非线性增大;塑性区主要分布在滑坡体后缘,随饱和度的增大,塑性区不断扩大,滑坡的稳定系数降低,达到饱和时,稳定状态接近极限平衡。冯家坝斜坡目前处于欠稳定状态,在长期暴雨和三峡Ⅲ期坝前水位浸泡共同作用下,很可能诱发滑坡形成灾害。
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| 关 键 词： | 散体滑坡 降雨 蠕变 强度衰减 饱和度 |
Analysis on Stability Evolvement of Loose Soil Landslide in the Case of Absorbing Strength Degradation |
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| CHEN Tao,TANG Hong-mei. Analysis on Stability Evolvement of Loose Soil Landslide in the Case of Absorbing Strength Degradation[J]. Journal of Chongqing Jiaotong University, 2008, 27(6): 1103-1107 |
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| Authors: | CHEN Tao TANG Hong-mei |
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| Affiliation: | CHEN Tao,TANG Hong-mei(Institute of Geotechnical Engineering,Chongqing Jiaotong University,Chongqing 400074,China) |
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| Abstract: | It is universally acknowledged that soil strength degradation and creep under water-Absorption are main factors of startup of landslide.Taking Feng Jiaba landslide in Wushan as an example,owing to the physical and intensive parameters of loose soil with different saturation got from laboratory tests,the trend of stability evolvement of loose landslide under rainfall is got by using Finite Element Method to simulate through the software ANSYS.The results indicate that the point with maximum displacement is i... |
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| Keywords: | loose soil landslide rainfall creep strength degradation saturation |
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