爆炸离心模型试验边界效应研究

摘要

离心模型试验中由于采用的模型箱尺寸有限，无法满足原位试验的半无限体要求，由此而形成边界效应问题，爆炸离心试验中此问题尤为突出.为比选边界材料，依托清华大学50 g-t土工离心机，进行了数次爆炸离心模型试验，通过加速度场分析，选择较合适的边界材料.最后通过试验确定，在50 g离心加速度2.5 g炸药爆炸离心模型试验中，边界上加入该边界材料后，离爆心20 cm内的试验成果可以接受.%Due to the limited size of model box,the centrifuge model can′t meet the requirement of semi-infinite body in situ experiment,which forms the boundary effects. This problem is especially prominent in blast centrifuge modeling. Relying on Tsinghua University 50 g-t geotechnical centrifuge,several blast centrifuge model tests have been done to select appropriate boundary material by analyzing the accelerating field. The results within 20 cm from the explosion center can be accepted under the conditions of acceleration 50 g,explosion 2.5 g after adding the material in boundary.