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针对笔者早期提出的静动力排水固结法处理高含水量饱和软黏土时存在水柱效应问题,利用多向高能电磁力冲击试验系统,对珠三角的淤泥进行高冲击能静动力排水固结室内模型试验,获得了淤泥力学响应相关规律:(1)土层中部与下部位置之间土压增量差值十分相近,孔压增量之间、土层压缩量之间亦有类似规律,初次验证了水柱效应的存在,即沿地基深度方向因瞬时不可压缩的水柱特性而可将相当部分夯击力传递至地基深处;(2)随着夯击遍数增加,冲击产生的附加应力与土自重比值逐渐增大,有效加固深度相应增加,夯击能可有效传递至地基土体深部。结果表明,当土中设置了竖向排水体系,不但有利排水,而且具有水柱效应,夯击时近似不可压缩的水柱可将冲击能量传递至地基深部软土中,使深层土体较充分排水固结。
According to the author’s earlier proposal of static and dynamic drainage consolidation method for the treatment of high water content saturated soft clay water column effect problems, the use of multi-directional high-energy electromagnetic force impact test system for the Pearl River Delta sludge high impact static and dynamic drainage consolidation indoor model The results show that: (1) The difference of soil pressure increment between the middle and the lower part of the soil layer is very similar. There is a similar law between the increment of pore pressure and the amount of soil compression. The initial verification The existence of water column effect, that is along the depth direction of the foundation due to the instantaneous incompressible water column characteristics can be a considerable part of the impact of the ram to the ground depth; (2) With the increase in the number of ramming, the impact of additional stress and soil Weight ratio gradually increased, the effective reinforcement of a corresponding increase in depth, tamping can be effectively transmitted to the deep foundation soil. The results show that when the vertical drainage system is set in the soil, not only the drainage but also the water column effect, the nearly incompressible water column can transfer the impact energy to the soft clay in the deep foundation so that the deeper soil body is fully drained Knot