黑方台焦家4号黄土滑坡发育特征及滑动机理

发布时间：2018-06-24 20:29

本文选题：超孔隙水压力 + 黄土滑坡　；参考：《人民长江》2017年11期

【摘要】：20世纪60年代以来,大量的灌溉系统在黄土地区建设运营,解决了农业的干旱问题,但同时灌溉也诱发了大量的滑坡。其中,2015年1月28日20:00,甘肃省永靖县焦家村发生了一起中等规模的黄土滑坡,滑坡严重影响其下方309国道线和六盘峡水库的安全。采用对裂缝分布、水文地质的调查,结合低空摄影测量、精细工程地质测绘、室内三轴试验等研究方法,对焦家4号滑坡的基本特征进行了分析,对形成滑坡的成灾机理有了初步认识。结果表明:(1)滑坡发生前,后缘裂缝有明显的变形情况;(2)滑坡滑动距离为548.3 m,体积为15.35万m~3,面积为6.6万m~2;(3)饱和黄土应力应变模式表现为强烈的应变软化剪缩型,并具有一定的静态液化特性;(4)滑坡是饱和黄土层静态液化引起的。
[Abstract]:Since the 1960s, a large number of irrigation systems have been built and operated in the loess region, which has solved the problem of agricultural drought, but at the same time irrigation has also induced a large number of landslides. Among them, at 20: 00 on January 28, 2015, a moderate loess landslide occurred in Jiaojia Village, Yongjing County, Gansu Province, which seriously affected the safety of the 309 National Highway Line and the Liupanxia Reservoir under the landslide. The basic characteristics of Jiaojia No. 4 landslide are analyzed by means of crack distribution, hydrogeological investigation, low-altitude photogrammetry, fine engineering geological mapping and indoor triaxial test. The mechanism of landslide formation is preliminarily understood. The results show that: (1) before the landslide occurs, the fracture in the rear edge has obvious deformation, (2) the sliding distance of the landslide is 548.3 m, the volume is 153500 mm3, the area is 66000 mm2, (3) the stress-strain model of saturated loess shows a strong strain softening shear shrinkage type. The landslide is caused by the static liquefaction of saturated loess.
【作者单位】：成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【基金】：国家重点基础研究计划(973计划)资助项目(2014CB744703) 国家创新研究群体科学基金项目(41521002) 国家杰出青年科学基金项目(41225011)
【分类号】：P642.22

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