爆炸成腔后土体物理力学性能的变化规律

在6块不同的土质场地完成了21次爆炸成腔试验，试验用炸药埋深为1.20～12.5 cm，起爆药量为0.05～51 kg。对其中的5个腔体进行了土工试验。对爆后土体的天然密度、孔隙比、饱和度、压缩系数、压缩模量、内摩擦角、黏聚力的分布规律进行了实测。试验结果表明，爆炸作用对土体的影响半径是爆炸成腔半径的4～6倍。土体的天然密度、干密度、饱和度、压缩模量和黏聚力等指标随土体距爆炸中心距离的增大而降低。土体的孔隙比、压缩系数和渗透系数等指标随土体距爆炸中心距离的增大而提高。未在腔壁附近发现密度低于原状土的低密度区。爆炸冲击作用对土体内摩擦角的影响规律不明显。

Variation pattern of soil physico-mechanical performance by explosive enlargement

Twenty-one field explosive enlargement tests were carried out on six different soil test sites.The embedded charge were 0.05-51 kg and their embedded depths were 1.20-12.5 cm.Five explosively formed cavities were employed for the soil mechanical test on the variation patterns of natural density,pore-solids ratio,saturation degree,compressibility,compression modulus,internal friction angle and cohesive strength.The test results show that the radii of soil mass affected by explosion are four to six times larg...