在爆炸载荷作用下连云港海淤的粘性特征  

THE VISCOUS CHARACTERISTICS OF SEAOOZE UNDER EXPLOSIVE LOADING AT LIANYUNGANG PORT

作　　者：许连坡[1] 

机构地区：[1]中国科学院力学研究所

出　　处：《爆炸与冲击》1990年第4期297-301,共5页Explosion and Shock Waves

基　　金：国家自然科学基金

摘　　要：本文研究了连云港海底淤泥的剪应力F_1和速度梯度du/dn的关系,得到在爆炸载荷下,它是幂律流体,而且幂指数α很小;这一点为爆破实验提供了很多方便。The viscosities of seaooze at Lianyungang port have been measured and described in this paper. The water content W, of the natural ooze is adout 80%; the cohesive force C under rapid shear is 2000 Pa; the internal friction angle φ=8° and the solid particle size ranges over 10-2-10-3mm. The test results for the natural ooze are shown in Fig.1 by curve 1 which indicates that the ooze be haves as a power-law fluid. The relationship between the shear force F, and the velocity gradient u/ n is given by Eq.(1) Because of the small value of a, when u/ n approaches 10-3-1·Fi, reaches only about the level of C and is far below that under the explosive loading.Therfore, for intense explosive loading the viscous force can be neglected, the geometrical similarity may hold and greatly convenient to the blasting model tests.The viscosity test results for the natural ooze added with water up to W, being 120%, 140%, 170% and 200% are shown in Fig.1 by curves 2-5 respectively, they indicate that for u/ n3s-1; Eq.(1) is still available and a keeps unchaged.However μ decreases with increasing of Ws. as shown by the curve 6 in Fig.1; and the fitting of which could be expressed as Eq.(3).Since the wave propagation may occur in the natural ooze, it may be more reasonable to take the rheid model for the analysis as shown in Fig.2.

关 键 词：爆炸 载荷作用 海淤 粘性 粘滞力 

分 类 号：TV148.6[水利工程—水力学及河流动力学]