饱和砂土场地微差爆炸液化的试验与数值分析  

Experimental and numerical investigations of liquefaction in saturated sand during multiple blasts with milliseconds interval

作　　者：姚颖康 王维国[2] 贾永胜[1] 陈育民 

机构地区：[1]武汉市市政建设集团有限公司,湖北武汉430023 [2]河海大学土木与交通学院,江苏南京210098

出　　处：《中南大学学报（自然科学版）》2017年第6期1621-1628,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51379067);长江学者和创新团队发展计划(IRT1125)~~

摘　　要：基于大型饱和砂土场地的多点微差爆炸液化试验,建立全耦合数值计算方法对试验过程进行模拟和验证,并分析爆炸延时、药包总质量等对土中超孔隙水压力上升的影响。研究结果表明:基于数值计算结果建立的多点爆炸液化经验公式能较好地反映超孔隙水压力比随比例距离的关系。场地中心区域更易受到爆炸波叠加作用的影响,当爆炸延时从110 ms增至330 ms时,超孔隙水压力可以提高18%以上;超孔隙水压力随着总药量的增加明显增大,增长趋势却逐渐减小。A fully coupled numerical model was set up and validated by the data from a multiple-blast liquefaction test. The influence of detonation delay and charge mass on excess porewater pressure was analyzed. The results show that the empirical equation established from the numerical results is a good way to describe the relationship between excess porewater pressure ratio and scaled distance. Excess porewater pressure increase can be up to 18% on the center area of the test pit when the detonation delay changes from 110 ms to 330 ms due to the superposition effect of blast waves. Excess porewater pressure increases with the increase of charge mass obviously, while the growth trend decreases gradually.

关 键 词：饱和砂土 微差爆炸 爆炸液化 超孔隙水压力 数值模拟 

分 类 号：TU437[建筑科学—岩土工程]