黄土湿密度对爆炸挤密规律的影响研究  

Influence Research of Moist Density of Loess on Explosive Compaction Laws

作　　者：李海超 魏连雨 常春伟 张艳萍 LI Hai-chao;WEI Lian-yu;CHANG Chun-wei;ZHANG Yan-ping(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;National Defense Transportation Department,Army Military Transportation University,Tianjin 300161,China;Civil Engineering Technology Research Center of Hebei Province,Tianjin 300401,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]陆军军事交通学院国防交通系,天津300161 [3]河北省土木工程技术研究中心,天津300401

出　　处：《爆破》2018年第3期60-67,共8页Blasting

基　　金：河北省交通运输厅科技计划项目(20140629)

摘　　要：为解决既有高速公路黄土路堤因压实度不足而造成的沉降量过大问题,以用爆炸挤密技术加固河北北部某高速公路黄土路堤为工程背景,研究了黄土湿密度对2号岩石乳化炸药条形药包爆破对高速公路黄土路堤爆炸挤密规律的影响。首先用ANSYS/LS-DYNA根据典型沥青路面高速公路的结构组成和几何尺寸建立有限元模型,通过数值模拟研究得出爆腔体积、密度峰值点相对爆心距、塑性变形水平半径与药包半径之比与土壤湿密度皆呈二次函数关系,作用于炮孔壁的初始压应力峰值与土壤湿密度呈线性关系。并将研究结论成功应用于爆炸挤密高速公路黄土路堤施工技术方案中炮孔平面布局的制定。In order to solve the problem of excessive settlement caused by insufficient compaction of loess embankment on existing expressway,taking strengthening the loess embankment of an expressway in the north of Hebei province by explosive compaction as an example,the influences of loess moist density to the law of explosion compacting loess embankment by linear charge of No. 2 rock emulsion explosive were studied in this paper. Firstly,finite element models were established by ANSYS/LS-DYNA based on the structure and geometry sizes of expressway with typical asphalt pavement. The simulation results showed that the relation between the size of the detonation cavity,the peak density to the detonation distance,the ratio of the horizontal radius of plastic deformation to the radius of the cartridge and the soil moisture density is quadratic. And the initial compressive stress peak acting on the borehole wall is linearly related to soil moisture density. The research results were successfully applied to the layout design of the blasting holes in the technical schemes for the explosion compaction of loess embankment of the expressway.

关 键 词：湿密度 爆炸挤密 条形药包 黄土 路堤 影响 

分 类 号：O383.1[理学—流体力学]