地震波斜入射下浅埋偏压双隧道地震响应分析  

Seismic Response Analysis of Shallow-Buried Unsymmetrical-Loading Double Tunnel Under Oblique Incidence of Seismic Wave

作　　者：朱辉 严松宏[1,2] 孙纬宇 欧尔峰 林峻岑[1] 汪精河 ZHU Hui;YAN Songhong;SUN Weiyu;OU Erfeng;LIN Juncen;WANG Jinghe(School of Civil Engineering,Lanzhou Jiaotong University Lanzhou,730070,China;Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province Lanzhou,730070,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]甘肃省道路桥梁与地下工程重点实验室,兰州730070

出　　处：《振动．测试与诊断》2024年第2期259-265,407,共8页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(52068044,52168058,52208392);甘肃省自然科学基金资助项目(21JR7RA309);甘肃省道路桥梁与地下工程重点实验室开放基金资助项目(GSDQ-KF2020-5);中国博士后科学基金资助项目(2021M693843)。

摘　　要：浅埋偏压隧道上覆岩土体薄弱,承受荷载不对称,在地震作用下的动力稳定性较差且易发生灾害。为研究其在地震作用下的动力响应特征,首先,基于波动理论将地震波转换为黏弹性人工边界上的等效节点荷载,建立了SV波斜入射时的荷载计算公式;其次,在ANSYS中编制APDL程序实现了黏弹性人工边界的自动生成和地震荷载的自动输入;最后,基于该输入方法,研究了某浅埋偏压双洞隧道在不同洞距时衬砌主应力的分布规律。结果表明:地震波斜入射时两隧道衬砌应力均为不对称的X型分布,随着洞距的增大,深埋侧隧道应力分布逐渐趋于对称,浅埋侧隧道应力分布无明显变化;当洞距达到4D(D为最大洞径)后,浅埋侧隧道对深埋侧隧道的影响可以忽略。因此,认为地震波斜入射时浅埋偏压双隧道的合理洞距为4D。The dynamic stability of shallow buried bias tunnel under seismic action is poor due to the weak overlying rock mass and unsymmetrical load,making it prone to disasters.In order to study its dynamic response characteristics under earthquake action,the seismic wave is converted to the equivalent node load on the viscoelastic artificial boundary based on the wave theory,and the load calculation formula of the oblique incident SV wave is established.Moreover,the APDL program is compiled in ANSYS software to realize the automatic generation of viscoelastic artificial boundary and the automatic input of seismic load.The lining principal stress distribution of a shallow-buried unsymmetrical-loading double tunnel with different tunnel distance is studied based on this input method.The results show that the stress distribution of the lining of the two tunnels presents asymmetric X-shape when the seismic wave is obliquely incident.With the increase of the distance between the tunnels,the stress distribution of the deep side tunnel tends to be symmetrical,while that of the shallow side tunnel does not significantly change.When the tunnel distance reaches 4D(D is the maximum hole diameter),the influence of shallow buried side tunnel on deep buried side tunnel can be ignored.Therefore,and it can be considered that the reasonable tunnel distance of shallow-buried unsymmetrical-loading double tunnel is 4D.

关 键 词：偏压隧道 地震波斜入射 合理洞距 地震响应 

分 类 号：TU435[建筑科学—岩土工程] U25[建筑科学—土工工程]