The catastrophic landfill flowslide at Hongao dumpsite on 20 December 2015 in Shenzhen, China
The catastrophic landfill flowslide at Hongao dumpsite on 20 December 2015 in Shenzhen, China
复制标题
DOI：
10.5194/nhess-17-277-2017
复制
发表时间：
2016-06
影响因子：
4.6
通讯作者：
Qiang Xu;Da-lei Peng;Wei-le Li;Xiu-jun Dong;Wei Hu;M. Tang;Fangzhou Liu
中科院分区：
文献类型：
--
作者：
Qiang Xu;Da-lei Peng;Wei-le Li;Xiu-jun Dong;Wei Hu;M. Tang;Fangzhou Liu
抽象的。2015年12月20日，中国深圳市光明新区红澳垃圾场发生灾难性滑坡。泥石流造成77人死亡，33座建筑物受损。在没有极端天气条件和地震活动的情况下，根据多时相遥感图像、现场调查、原位测试、室内试验和数值分析，分析了失效的原因。现场调查表明，位移材料的体积为2.32 × 106 m3，破坏前的废物填充体积为6.27 × 106 m3。流滑的特点是运动速度高，跳动距离长。被置换的材料主要是含水量为17.3- 42.4%的粉质土和建筑和拆除废物的混合物。事故的主要原因是：（1）由于排水系统故障和下伏的不透水花岗岩层，地下水流在垃圾场停滞;（2）垃圾填埋的累积速度和总体积超过设计容量。流动滑坡可能归因于过量孔隙水压力的发展，因为在几个位置观察到液化的证据，据推测，这种现象与不受管制的处置活动所施加的超载有关。
Abstract. A catastrophic flowslide occurred at the Hongao dumpsite on 20 December 2015 in the Guangming New District of Shenzhen, China. The flowslide caused 77 causalities and damaged 33 buildings. In the absence of extreme weather conditions and seismic activity, the causes of the failure were analyzed on the basis of multi-temporal remote-sensing images, site investigation, in situ tests, laboratory tests, and numerical analyses. Site investigations showed that the volume of the displaced material was 2.32 × 106 m3 and the volume of the pre-failure waste filling was 6.27 × 106 m3. The flowslide was characterized by high travel velocity and long runout distance. The displaced material was primarily a mixture of silty soil and construction and demolition waste with water content of 17.3–42.4 %. The primary causes of the failure were concluded to be the following: (1) groundwater flow had stagnated in the dumpsite due to drainage system failure and the underlying impermeable granite stratum; (2) the accumulation rate and total volume of the waste filling was in exceedance of the design capacity. The flowslide may be ascribed to the development of excess pore-water pressure as evidence of liquefaction was observed at several locations, and it is postulated that such phenomena were related to the surcharge loads imposed by the unregulated disposal activities.