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泥石流灾害的破坏能力除了受地质、地形及水文条件的控制外,还与泥石流浆体特性密切相关。对采集于东月各特大粘性泥石流堆积体中2 mm以下土体样本进行了土水混合静置试验,并进行了粒度分析,以计算上限粒径D_0、分析密度变化对于泥石流浆体乃至泥石流体悬浮能力的影响;同时结合2 mm以下土体沉积现象探讨了泥石流体沉积规律与运动特征。试验结果表明,密度小于1.80 g/cm~3的浆体中,粒径0.07~0.20 mm部分较多集中于上层L1,而在中层L2与下层L3中含量较其他四组样品含量少;L1/L2,L1/L3比值随密度增加有一段明显的上升趋势;密度较小的样品浆体超孔隙水压力较小,浆体释水较快并且颗粒沉积呈明显的分选性;在极限状态下密度小于1.85 g/cm3的样品上限粒径D0较稳定,并且随着浆体密度增大,D_0值逐渐增大。
In addition to being controlled by geological, topographic and hydrological conditions, the destructive capacity of debris flow hazards is closely related to the slurry characteristics of debris flow. The soil samples collected below 2 mm in the large viscous debris flow accumulation in East China were tested for soil-water mixing and granularity analysis to calculate the upper limit of particle size D_0. The analysis of the change of density on debris flow debris and debris flow Suspended capacity of the impact; at the same time with less than 2 mm soil sediment phenomenon of debris flow fluid deposition and movement characteristics. The experimental results show that in the slurry with the density of less than 1.80 g / cm ~ 3, the part with the diameter of 0.07 ~ 0.20 mm is mainly concentrated in the upper layer L1, while the content in the middle layer L2 and the lower layer L3 is less than the other four samples; L2, L1 / L3 ratio increased with the density has a clear upward trend; the density of the smaller sample slurry pore water pressure is smaller, the slurry water release faster and particle deposition showed obvious sorting; in the limit state The upper limit of particle size D0 of samples with density less than 1.85 g / cm3 is more stable, and the value of D_0 increases with the increase of slurry density.