极端暴雨工况下弃渣场稳定性分析

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为研究降雨对弃渣场稳定的影响,以某弃渣场为例,根据该区域降雨历史数据分析出极端暴雨工况降雨量,用Midas软件模拟分析在极端暴雨工况下弃渣场斜坡的应力、应变、位移及稳定系数.研究表明:弃渣斜坡剪应变集中区域为弃渣与原位斜坡结合处,应变值为4.4×10-5,局部区域应变突增范围在5.003×10-2~1.125×10-1之间,占比为2%,但整个模型绝大部分区域没有发生突变;整个弃渣场斜坡表面应力分布较均匀,应力矢量方向都为沿Z负方向,没有发生应力突变现象;弃渣斜坡位移主要集中在第四级平台上,整个模型未出现位移突变现象;由模型计算结果得出弃渣斜坡在极端暴雨工况条件下稳定性系数为1.5621,大于一级边坡安全等级的稳定系数要求.经过长时间的自然沉降、弃渣过程中渣土车辆的不断碾压,弃渣场逐渐趋于稳定,没有发生泥化、软化、滑坡失稳现象,软件数值模拟分析结果与现场情况较吻合.
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