摘要
本文研究了连云港海淤在爆炸作用下的性质:给出了模型实验中爆破坑和鼓包运动的测试结果及其分析。
In order to study the possibility of the blasting method that may be used to treat the soft ground on the seabottomand find its technique problems.we made some model experiments in our laboratry. The experimental device is presented in fig.1. The disturbed ooze gotten from the seabottom has the character of power-law fluid which is shown in the ralution (1). Because both η and α are smaller, the solidifying strength and viscous force may be neglegted under blasting loading. In bulge developing, the inertia is larger than the viscous force, medium may be considered as an ideal fluid. So. the crack is not observed in the cavity and the medium in the bulge is continuous.The viscous force is important for crater forming.but it's variation is not large in the experiment When the minimum burden W becomes larger, the gravity will make the ooze flow and changes the size of the crater; but, in our experiments W is not large, and the gravity has no effect to the measure of blasting crater. Therefore, the diameter of the blasting crater only relates to Q/W3. The results are shown in fig.7. The experimental results explain that the Boleskov's formula Q=k(0. 4 + 0. 6n3 )W3 is not suitable to the blasting in the ooze.In the bulge developing, one of the characters is that the moving direction of the particle on the bulge surface is vertical to the original (fig.9). The curves of the relation between bulging height and time are given in the fig.10 and fig.l1. There exist both accelera-tive and decelerative periods in bulge developing. In the centre of the bulge, the particle velocity only relates with Q/W3 by formula (7) which is obtained by experiments. In fig. 14 , the data with the mark are the results in field blasting.The geometric similarity law is satisfied in principle.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
1989年第4期328-337,共10页
Explosion and Shock Waves
基金
连云港建港指挥部
力学所
三航设计院和锦屏磷矿四方合作项目
关键词
爆破
淤泥
鼓包运动
海底
blasting in seaooze. power-law fluid, blasting crater.bulge moving,minimum burden.
