孔隙水压力及炸药埋深对堤坝爆炸效应的影响分析  

Analysis of influences of pore water pressure and buried depth of explosive on blasting effect of embankments

作　　者：张智超[1,2] 陈育民[1,2] 刘汉龙[1,2] 王维国[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学土木与交通学院,南京210098

出　　处：《岩土力学》2012年第7期2214-2220,共7页Rock and Soil Mechanics

基　　金：国家杰出青年科学基金项目(No.50825901);国家自然科学基金项目(No.50909040)

摘　　要：爆炸荷载作用下的堤坝破坏形态研究在国防以及工程应用中都具有重要意义。为了研究堤坝在不同爆炸工况下产生的破坏形态,在LS-DYNA软件框架内,建立了适合于爆炸荷载作用下土体动力分析的实用模型,并基于多物质ALE法,对均质土坝遭受爆炸袭击开展了仿真分析,得到了不同炸药埋深以及不同孔隙水压力上升程度下的堤坝爆炸弹坑形态。结果表明,随着炸药埋深的增加,堤坝弹坑尺寸具有增大的趋势,但当埋深超过一定范围,则无法形成弹坑;同时,爆炸荷载作用下含水土体的孔隙水压力发展对弹坑的形成具有重要影响,孔隙水压力上升程度越强,产生的弹坑尺寸就越大。研究结果可以为堤坝抗爆安全设计以及爆破拆除堰塞坝等工程提供参考。The failure pattern of embankment under explosive load is of great importance to the national defence as well as engineering application.In order to study the failure formations of embankments under different explosion conditions,the constitutive model which can well describe the dynamic property of soil is proposed in the frame of LS-DYNA.Meanwhile,by means of multi-material arbitrary Lagrange-Euler method（ALE method）,the simulations are implemented for homogeneous earthfill dams under explosive load;the crater formations are obtained with different buried depths of explosive and different pore water pressure developments of soil.The numerical results reveal that the crater size increases with the increasing of buried depth of explosive,while crater can’t develop if the buried depth beyond a certain range.In addition,the pore water pressure development of moist soils is significant to the formation of blasting craters;with the increasing of pore pressure development,the crater tends to grow bigger.These analysis results can provide references for the design of embankments safety and for engineering application such as blasting demolition of barrier dams.

关 键 词：爆炸荷载 弹坑 孔隙水压力 堤坝安全 多物质ALE法 

分 类 号：TV64[水利工程—水利水电工程]