工程爆破

2018, v.24;No.104(04) 1-9

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爆炸荷载作用下腋角对地下连通道的影响
Investigation of the influence of haunch on underground passage under blast loading

谢乐;杨志勇;陈军东;赵亮;
XIE Le;YANG Zhi-yong;CHEN Jun-dong;ZHAO Liang;School of Civil Engineering and Architecture,Wuhan University of Technology;

摘要(Abstract):

采用ANSYS/LS-DYNA动力有限元分析程序,建立土中中等矩形截面地下连通道有限元模型,利用流固耦合算法,模拟土中爆炸荷载作用下通道衬砌结构的动态响应过程,得到结构顶板的横向拉应力、压应力峰值分布以及顶板的最终合位移分布,并得到侧墙上的竖向拉应力、压应力峰值分布。对比分析通道在添加不同尺寸腋角时的响应结果得到结论:对于顶板外侧单元,中部压应力峰值最大,顶板与腋角连接部位的拉应力峰值最大,并且峰值最大值受腋角尺寸的影响都较小,但其他大部分部位的压应力在腋角尺寸增大时有明显减小;侧墙上竖向拉应力和压应力峰值最大值均出现在与腋角连接处,腋角尺寸的变化对内侧影响较大;顶板位移峰值最大值随腋角尺寸增大而减小,并且腋角高度的影响作用随高度增加先增大后减小,宽度的影响作用随宽度的增大逐渐减小。
A finite element model of medium-sized sectional rectangular underground connecting passage in soil was established.The dynamic finite element analysis program ANSYS/LS-DYNA was used to simulate the explosive load response of the rectangular cross-sectional passage by using the fluid-solid coupling algorithm.The distribution curves of peak transverse tensile stresses and compressive stresses and the final displacement distribution of the roof were obtained.The distribution curves of peak vertical tensile stresses and compressive stresses were obtained for the side wall.Based on the comparison of the response of the passage with different sizes of haunches added,it shows that for the outer roof units,the peak compressive stress in the middle roof is the largest and the peak of tensile stress is the maximum in the connecting part between the roof and the haunch.In addition,the maximum peak values are significantly affected by the size of the haunch.However,the compressive stresses of most other parts decrease obviously with the increasing haunch size.For the side-wall,both the maximum vertical tensile stresses and compressive stresses appear at the intersection with the haunch and the change of the size of haunches has a significant influence on the inner side.The maximum displacement of the roof decreases with the increasing haunch size.And the effects of haunch height first increase and then decrease with the increasing height while the effects of haunch width decrease all the time.

关键词(KeyWords): 地下连通道;土中爆炸;数值模拟;腋角;爆炸荷载
underground connecting passage;explosion in soil;numerical simulation;haunch;blast loading

Abstract:

Keywords:

基金项目(Foundation): 人民防空科学技术研究“十二五”重点资助项目(43150011)

作者(Authors): 谢乐;杨志勇;陈军东;赵亮;
XIE Le;YANG Zhi-yong;CHEN Jun-dong;ZHAO Liang;School of Civil Engineering and Architecture,Wuhan University of Technology;

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