条形药包爆炸作用在土中显著影响范围的数值模拟

爆炸固结法是软土地基处理的新方法。为了分析爆炸作用在土中的变化规律,通过有限元方法对单孔条形药包在土中爆炸的数值模拟,在验证计算结果与实测数据的基础上,对地基中单孔条形药包在上覆压力和药量两组爆炸参数下进行模拟对比分析,以解决在不同上覆压力和药量条件下条形药包爆炸作用在土中的显著影响范围。针对条形药包土中爆炸问题,运用ALE算法解决了炸药网格的畸变问题。研究结果表明,上覆压力发挥作用的主要时间不是在爆炸瞬间,而是在爆炸以后的时间段,主要的贡献是对爆炸产生的孔隙水压的消散作用。而炸药的药量对于布置爆炸孔和竖向排水通道的间距影响具有较大影响。

NUMERICAL SIMULATION OF AFFECTED ZONE BY POWDER EXPLODING IN SINGLE HOLE IN SOFT SOIL TREATMENT

The consolidation method by exploding is a new treatment technique in soft soil ground.To analyze the variation of the exploding effect in ground,this paper presents numerical simulation of single hole powder exploding in soft ground through finite element method.On the basis of verifying the result of calculation with that of in situ measurement,the paper examines the main affected zones in the soil due to powder exploding in single hole.Different cover pressure and explosive dosage are further studied.For the problem of single hole powder exploding in soil,the ALE algorithm is used to resolve the aberrance of mesh.The result indicates that the time for the cover pressure taking effect was after an exploding,not on the exploding.Dissipation of pore water is the most contributing factor for the effectiveness.The explosive dosage has important influence on the spacing of holes and vertical drainage channels.