爆炸法处理陆上软土地基的作用机理研究

项目名称： 爆炸法处理陆上软土地基的作用机理研究

项目编号： No.50809046

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 崔溦

作者单位： 天津大学

项目金额： 20万元

中文摘要： 随着我国交通事业的飞速发展，对特殊条件下的软基处理提出了更高要求。由于沟谷和湿地等地区的陆上软基具有与近海淤泥质基础相近的特点，因此，在借鉴水下爆炸排淤技术的基础上，提出了爆炸法处理陆上软基的基本思想，但由于陆上软基与近海淤泥质基础还存在差异，加之地表水的存在对该项技术的影响，因此，开展爆炸法处理陆上软基作用机理的研究具有重要的理论意义和实用价值。本课题根据已有的工程资料，结合现场试验，采取室内爆破试验得到爆炸作用下软土的属性变化和变形特性，并结合理论分析建立软土的本构模型；基于欧拉～拉格朗日耦合技术，深入研究描述爆轰产物～堆石～软土～水相互作用的数值模拟方法，进而对陆上爆炸法施工的爆坑形成和堆石挤入过程、爆后断面等问题开展研究；基于土力学和爆炸力学的基本理论，建立一定层厚软土下的用药量公式；最后利用上述研究结论优化爆破设计，达到加快施工进度、改进处治效果和节约工程投资的目的。

中文关键词： 爆炸法；陆上软基；数值模拟；用药量公式；作用机理

英文摘要： With the development of Chinese highway traffic, the further request for soft foundation treatment under special conditions was put forward. For the approximate characters about soft foundation on land and soft silty foundation on coast land, the method of blasting method applied in soft foundation treatment on land was being put forward. Because of the difference of foundation characters between on land and on coast land, and the effect of surface water on the technology, it is necessary to reseach the action mechanism of blasting method applied in foundation treatment. Based on observation data of field test, uesd laboratory blasting test to obtain attribute varation and deformation character, and combined with theory analysis, the constitution relation of soft soil was constructioned. Based on coupled Eulerian-Lagrangian numerical approach, numerical simulation method of the ineraction among blasting prodction, rockfill, soft soil and water was studied. According to the basic theory of soil mechanics and explosion mechanics, the charge weight equation under certain thickness of soft soil was defined. Finally, used above theory in practice, the aims of quickening construction, improving treatment effect, saving engineering invest will be reach.

英文关键词： blasting method;soft foundation on land;numerical simulation; charge equation; action mechanism