地裂缝地层盾构隧道地铁振动效应试验研究  

作　　者：杨觅 宫飞祥 王鹏 

机构地区：[1]陕西交通控股集团有限公司,陕西西安710065 [2]西安建筑科技大学环境与市政工程学院,陕西西安710054 [3]西安中交公路岩土工程有限责任公司,陕西西安710075

出　　处：《科技创新与应用》2022年第20期25-28,32,共5页Technology Innovation and Application

基　　金：国家自然科学基金项目(41172257);陕西省交通运输厅科研项目(19-19K)。

摘　　要：基于相似理论设计并开展地铁动荷载作用下盾构隧道-地裂缝-地层振动响应的模型试验,从振动加速度有效值和振动加速度级等方面分析振动波在地裂缝邻近土层中的传播规律,地裂缝及行车速度对土层振动响应的影响规律。结果表明,地层对地铁振动有显著的衰减作用,高频振动沿竖向的衰减速度较中低频振动快;地裂缝上下盘振动加速度有效值的差异显著,与无地裂缝条件下的振动响应相比,地裂缝导致上盘衬砌下部和下盘衬砌上部地层的振动加强,上盘衬砌上部和下盘衬砌下部地层的振动减弱;地裂缝导致衬砌下部地层中5~80 Hz频段内的部分振动在局部位置出现反弹增大现象;随着车速的增加,地层的振动加速度有效值呈先迅速增加后缓慢增加的趋势,过渡车速约为67.2 km/h。研究成果可以为地铁工程减振设计提供参考。Based on the similarity theory,the model test of ground fissures stratum vibration response of shield tunnel under metro dynamic load is designed and carried out.The propagation law of vibration wave in the adjacent soil layer of ground fissures and the influence of ground fissures and driving speed on soil vibration response are analyzed from the aspects of effective value of vibration acceleration and vibration acceleration level.The results show that the stratum has a significant attenuation effect on metro vibration,and the vertical attenuation rate of high frequency vibration is faster than that of middle and low frequency vibration,and there is a significant difference in the effective value of vibration acceleration between the upper and lower parts of ground fissures,compared with the vibration response under the condition of no ground fissures.The ground fissures lead to the strengthening of the vibration of the upper part of the upper lining and the upper part of the lower lining,and the weakening of the vibration of the upper part of the upper lining and the lower part of the lower lining.Ground fissures cause part of the vibration in the 5~80 Hz band of the lower stratum of the lining to rebound and increase in the local position;with the increase of vehicle speed,the effective value of vibration acceleration of the stratum increases rapidly at first and then increases slowly,and the transition speed is about 67.2 km/h.The research results can provide reference for the vibration reduction design of metro engineering.

关 键 词：西安地裂缝 地铁动荷载 盾构隧道 振动响应 模型试验 

分 类 号：TU435[建筑科学—岩土工程]