冲击荷载作用下岩土材料能量耗散的有限元分析  

FINITE ELEMENT ANALYSIS ON ENERGY DISSIPATION OF GEO-MATERIALS INCURRED BY IMPACTING LOAD

作　　者：闫澍旺[1] 禚瑞花[1] 王武刚[1] 杨媛[2] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津城市职业学院,天津3000161

出　　处：《工程力学》2013年第5期160-164,共5页Engineering Mechanics

基　　金：国家自然科学基金项目(50309009)

摘　　要：当海上平台落物或商船抛锚会对海底管线造成一定的损害。通常的防护措施是管线的上部覆盖一层岩土材料,耗散部分落物冲击。运用非线性有限元程序Ls-DYNA/ANSYS对岩土材料耗散冲击物产生的能量的能力进行了数值模拟。对于碎石层的计算结果与挪威海洋工程规范中依据实验得到的结果一致,验证了该程序用于研究材料层能量消散能力方面的适用性。由于缺乏与粘土相关的研究,该文采用Ls-DYNA/ANSYS程序对粘土材料层消散能量能力进行了分析计算,成果可供海底管线保护设计的参考。The seabed pipeline can possibly be damaged by weights dropping from ocean platforms or anchors from commercial ships. The commonly adopted method to protect the pipelines is to cover the pipeline with a layer of geo-materials, such as crushed stone, sand or clay, which can dissipate part of the energy of the falling objects. The non-linear finite element program Ls-DYNA/ANSYS is applied to simulate numerically the capacity for the geo-materials to dissipate the energy of the falling objects. The calculation results for the crushed stone coincide well with those recommended by the current Code of DNV-rp-fl07_2010 that is based on experiment data, which proves the feasibility of using this program to estimate the energy dissipating capacity of the geo-materials. Because little research has been performed with clay soil, the program Ls-DYNA/ANSYS is used to predict the energy dissipating capacity of clay layers. The achievement can be referred by the seabed pipeline protection design.

关 键 词：岩土工程材料 碎石 粘土 能量耗散 落物 刺入深度 LS-DYNA ANSYS 

分 类 号：TV92[水利工程—水利水电工程] TU990.3[建筑科学—市政工程]