防汛抢险训练场渗透破坏段设计方案试验分析

Design analysis of a seepage failure segment for the flood control training field of Jiangsu Province

建设仿真性的防汛抢险训练场,提供有实战氛围的防汛抢险演练环境,在国内外尚属首次。为支撑江苏省防汛抢险训练场渗透破坏段方案设计,基于土体渗透破坏的基本理论并考虑到防汛演练的实际需求,首先确定用于堤坝填筑土料的料源,并对此进行了物理力学特性试验研究,根据粒径分布曲线推求非饱和渗流分析参数。然后开展两种不同比尺的水工模型渗透破坏试验,并与数值计算结果进行对比,验证数值分析的可靠性和合理性。最后对演练模型进行数值分析,根据上述试验和数值分析结果对设计方案提出相应的建议。上述设计方案基于均质土,实际填筑过程中土料的不均匀性较大,其合理性尚有待于实际工程的进一步验证。

The construction of a flood control training field to provide a real drill ground for simulating flood control environment is the first at home and abroad. In order to support the design analysis of a seepage failure segment for the flood control training field of Jiangsu Province,based on the basic theory of soil seepage failure and taking into account the actual needs of the flood control training,the filling material of the embankment is determined firstly.The physical and mechanical property tests are conduted,and then the unsaturated seepage analysis parameters are estimated from the grading curves. Two different scale models for the seepage failure are established,and the model test results are compared with the numerical calculation results to verify the reliability of the numerical analysis.Finally,the seepage numerical analysis of the practice model is performed. According to the above experimental and numerical analysis results,the corresponding conclusions and recommendations are put forward for the design scheme. The suggested design scheme is based on the homogeneous soil,and its rationality remains to be further verified in the actual projects because the inhomogeneity of the actual filling material is larger.