人工堆载诱发黄土滑坡失稳机制分析  

Mechanism of loess landslide induced by loading

作　　者：陈春利[1] 李同录[1] 贺凯[1] 王鹏[1] 

机构地区：[1]长安大学地质工程系,陕西西安710054

出　　处：《中国地质灾害与防治学报》2014年第1期1-5,共5页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金项目(40972182);十二五国家科技支撑课题(2012BAK10B01)

摘　　要：随着黄土地区工程建设快速推进,开挖黄土边坡后的弃土废渣直接堆放在斜坡上,从而成为黄土地区人工诱发滑坡灾害的主要类型,其失稳机制的研究具有重要意义。以延安市某人工堆载边坡为例,通过黄土三轴试验分析了堆载作用下原状黄土的强度变形特性,并运用数值模拟研究了边坡堆载过程中潜在最危险滑面上的应力及强度变化趋势,揭示了堆载诱发黄土边坡变形破坏机理。研究结果表明:边坡堆载改变了坡体的应力分布,致使坡体中、下部土体剪应力逐渐接近其抗剪强度,边坡的稳定性随之降低直至失稳破坏。In the loess area, spoil of construction excavation are always stacked on slope, which induced many loess landslides, and the loading-induced loess landslide has been a typical human-induced landslide in the Loess Plateau. Hence there are practical significances to study on its mechanism. Focus on a slope under loading condition in Yan＇an, strength deformation characteristics of loess were got through the indoor test. Based on geological exploratory profile of the slope, numerical analysis models are established. The stress and strength change on the most dangerous slip surface of slope during loading are studied. The mechanical mechanism of occurrence and development of deformation and failure of loess landslide are revealed. The results show that loading on loess slope changed the stress distribution and the shear stress in middle and lower part of slope gradually came closed to the shear strength during loading, causing the stability of slope reduced until the landslide occurred in the end.

关 键 词：黄土边坡 人工堆载 三轴试验 变形机理 数值模拟 

分 类 号：P694[天文地球—地质学]