平原水库浸没地下水临界埋深分析

平原水库蓄水易产生水库浸没,危害周围农作物和建筑物,需确定平原水库地下水临界埋深。对于农作物,水库浸没导致农作物发生渍害和次生盐渍化,利用作物根系层厚度计算防止农作物发生渍害的临界埋深;引入矿化度级差计算防止土壤次生盐渍化的临界埋深,选取两者最大值作为农作物浸没临界埋深。对于建筑物,引入弹塑体结构计算模型,根据承载力与地基应力的关系计算承载力影响下的临界埋深,根据应力分层总和法确定受附加应力影响的临界埋深,最后利用层次分析法计算权重大小,综合考虑各因素确定建筑物浸没临界埋深。通过提出地下水临界埋深评价方法为减轻浸没危害、预测库区可能发生浸没的地区范围提供了依据。

Analysis of Critical Depth of Submerged Groundwater in Plain Reservoir

Plain reservoirs is prone to reservoir immersion, which causes certain damage to the surrounding main crops and buildings. It is necessary to determine the critical groundwater depth of the plain reservoir. For crops, reservoir immersion will cause water-logging and secondary salinization. The critical depth of water-logging prevention is calculated by using the thickness of crop root layer. The critical depth to prevent secondary salinization was calculated by introducing the mineralization grade difference. The maximum of two critical depths is chosen as the critical depth of the crop immersion. For the building, the calculation model of the elastic structure is introduced. According to the relationship between the bearing capacity and the foundation stress, the critical depth is obtained from the factors affecting the bearing capacity. The critical depth of the factors affected by the additional stress is determined according to the stress stratification sum method. Finally, the weight is calculated by AHP. The critical depth of immersion is determined by considering various factors. The evaluation method of critical depth of groundwater is proposed to reduce the risk of submersion and predict the area range of possible submersion.