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基于滑带软化的滑坡渐进破坏机制分析 预览

Analysis of Landslide Progressive Failure Mechanism Based on Sliding Zone Softening
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摘要 渐进式滑坡是一个由量变到质变的动态发展过程,其破坏过程和稳定性变化规律分析是滑坡分析与处理的重点和难点。对于渐进式滑坡的破坏过程,其实质是滑带的应变软化过程,利用FLAC3D软件的应变软化本构实现渐进破坏过程模拟;对于渐进式滑坡的稳定性变化规律,结合应变软化过程并考虑强度参数粘聚力和内摩擦角的软化程度的差异,提出一种双强度折减的动态稳定性评价方法。以奉节某渐进式滑坡为例进行这两方面的数值分析,在滑坡坡脚路基开挖之后,随着塑性剪切发展,滑坡破坏呈现由坡脚向坡顶扩展的渐进式发展规律。二者结果对比互补,验证了两种方法的合理性,很好地实现了渐进式滑坡的破坏机制分析。 Progressive landslide is a dynamic development process from variable to qualitative change.Its failure process and stability analysis are the key and difficult points of landslide analysis and treatment.For the gradual failure process of progressive landslide,it is the strain softening process of sliding zone,and the strain softening constitutive method of FLAC 3D software is used to simulate the progressive failure process.For the stability analysis of progressive landslide,combining with the strain softening process and considering the difference between the softening degree of the strength parameter cohesion and the internal friction angle,a dynamic stability evaluation method of double safety factor strength reduction is proposed.Taking the progressive landslide of Fengjie as an example,the numerical analysis of these two aspects is carried out.After the excavation of the embankment of the landslide,with the development of the plastic shear,the landslide failure shows the progressive development of the slope from the foot to the top of the slope.The results of the two methods complement each other,verify the rationality of the two methods,and realize the analysis of the breaking mechanism of the progressive landslide.
作者 苏永华 蹇宜霖 张航 SHU Yonghua;JIAN Yilin;ZHANG Hang(Institute of Geotechnical Engineering,Hunan University,Changsha,Hunan 410082,China)
出处 《公路工程》 北大核心 2019年第1期32-37,62共7页 Central South Highway Engineering
基金 国家自然科学基金项目(51578232 51378195).
关键词 渐进式滑坡 滑带 应变软化 数值分析 稳定性分析 progressive landslide sliding zone strain softening numerical analysis stability analysis
作者简介 苏永华(1965-),男,博士,教授,主要从事岩土工程科研与教学工作。
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