复杂条件隧道洞口区域泡沫混凝土结构减震效果分析  

Analysis on Damping Effect of Foamed Concrete Structure in Tunnel Entrance Area under Complex Conditions

作　　者：徐慧宇 宋旭辉 XU Huiyu;SONG Xuhui(CCCC Railway Design and Research Institute Co.,Ltd.,Guangzhou 100032,China;China Gezhouba Group Municipal Engineering Co.,Ltd.,Yichang 443002,Hubei,China)

机构地区：[1]中交铁道设计研究院有限公司,广州100032 [2]中国葛洲坝集团市政工程有限公司,湖北宜昌443002

出　　处：《路基工程》2024年第4期153-158,共6页Subgrade Engineering

摘　　要：基于扎墨公路嘎隆拉隧道洞口区域复杂工程地质条件,开展泡沫混凝土材料减震机理及减震效果研究;针对不同厚度泡沫混凝土,分析隧道洞周各个测点的弯矩、最大主应力及竖向位移增量等特征值的变化规律,综合考虑工程经济性等因素,基于地震荷载作用下穿越断裂带的隧道结构,在满足隧道结构不整体坍塌的前提下,围岩与衬砌之间泡沫混凝土材料最佳厚度为15~20 cm。Based on the complex engineering geological conditions at the entrance of Galongla Tunnel on Zhamu-Motuo Highway,the damping mechanism and damping effect of foamed concrete materials are studied.For foamed concrete with different thicknesses,the variation rules of characteristic values such as bending moment,maximum principal stress and vertical displacement increment at each measurement point around the tunnel were analyzed.Comprehensively considered engineering economy and other factors,based on the tunnel structure crossing the fault zone under seismic load,the optimum thickness of foamed concrete material between surrounding rock and lining is 15-20 cm under the premise that the tunnel structure does not collapse as a whole.

关 键 词：隧道洞口 泡沫混凝土 减震机理 防控技术 沉降监测 减震效果 经济性 

分 类 号：U45[建筑科学—桥梁与隧道工程]