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2015年12月20日11时40分许,广东省深圳市光明新区红坳村渣土临时受纳场发生一起渣土堆填物特大滑坡事故,滑坡覆盖面积约38.5×10~4m~2。根据前人对滑坡特征与成因机制的分析成果并结合现场调查可知,堆填物底部饱水形成软弱滑动层是滑坡失稳破坏的主要原因。为了对滑坡堆填物底部饱水的原因进行分析,文章对滑坡土体的渗透性进行了常水头渗透试验与物理模拟试验研究。研究结果表明:深圳“12·20”滑坡土体渗透系数明显大于一般黏土;渗透系数随着初始含水率和干密度的增大均呈指数函数关系,且相关系数分别大于0.96与0.925;在后缘注水的情况下,土体的垂直渗透性大于水平渗透性。
At 20:20 on December 20, 2015, a large landslide incident occurred in the temporary receiving field of red earth in Hong’ao Village, Guangming New District, Shenzhen City, Guangdong Province. Landslide cover an area of about 38.5 × 10 ~ 4m ~ 2. According to the predecessors’ analysis of the characteristics and mechanism of landslide and the field investigation, it is known that the formation of weak sliding layer with saturated water at the bottom of the fill is the main reason for landslide failure. In order to analyze the reason of saturated water at the bottom of the landslide fillings, the permeability of the landslide soil was tested by constant head penetration and physical simulation tests. The results show that the permeability coefficient of landslide in “12 · 20 ·” landslide in Shenzhen is obviously larger than that in general clays. The permeability coefficient shows an exponential function with the increase of initial moisture content and dry density, and the correlation coefficients are greater than 0.96 and 0.925 respectively. In the case of trailing edge water injection, the vertical permeability of soil is greater than the horizontal permeability.