泡沫混凝土回填层在坑道中的耗能作用  

Energy dissipation mechanism of foamed concrete backfill layers in underground tunnels

作　　者：唐德高[1] 王昆明[1] 贺虎成[1] 吴红晓[2] 曲霞[1] 

机构地区：[1]解放军理工大学工程兵工程学院,江苏南京210007 [2]第二炮兵工程设计研究所,北京100011

出　　处：《解放军理工大学学报（自然科学版）》2006年第4期365-370,共6页Journal of PLA University of Science and Technology(Natural Science Edition)

摘　　要：为了研究泡沫混凝土耗能层的作用机理及其对坑道结构动力响应的影响,根据某工程实例,建立了地冲击波作用下Ⅳ类岩体中坑道结构响应的计算模型。利用LS-DYNA有限元软件,分别计算了无耗能层和增设泡沫混凝土耗能层两种情况下坑道结构的动力响应,提出了混凝土耗能层的作用机理。计算结果表明,增加泡沫混凝土耗能层后,坑道结构的应力峰值衰减了95%以上,加速度和位移等运动参数也有不同程度的降低。泡沫混凝土耗能层能够明显减小结构的动力响应,可以用来构筑较理想的结构消波吸能型式。To study the energy dissipation mechanism of foamed concrete and its influence on dynamic response in underground tunnels,based on an engineering example,a calculation model of dynamic response of the tunnels in Ⅳ rock mass was established under the ground shock. The dynamic response of underground tunnels with foamed concrete and without were calculated by the software of LS-DYNA. And the energy dissipation mechanism of foamed concrete was presented. The final result shows that the stress peak value of the tunnel is reduced by 95 % with the foamed concrete backfill layers,and dynamic parameter such as acceleration and displacement is attenuated to a certain extent. The dynamic response of tunnels can largely be reduced by the foamed concrete backfill layers,which can be used to construct a sort of ideal energy absorption support structure.

关 键 词：泡沫混凝土 耗能机理 坑道 动力响应 数值分析 

分 类 号：E95[军事—军事工程] TU528.2[建筑科学—建筑技术科学]