上土下岩地层中柱面SH波的传播特性分析  

Analysis of propagation characteristics of cylindrical SH waves in upper soil and lower rock strata

作　　者：张茂晨 路世伟 周传波[2] 孙金山 ZHANG Mao-chen;LU Shi-wei;ZHOU Chuan-bo;SUN Jin-shan(School of Urban Construction,Yangtze University,Jingzhou 434023,Hubei,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;Hubei(Wuhan)Institute of Explosion Science and Blasting Technology,Jianghan University,Wuhan 430056,China)

机构地区：[1]长江大学城市建设学院,湖北荆州434023 [2]中国地质大学(武汉)工程学院,武汉430074 [3]江汉大学湖北(武汉)爆炸与爆破技术研究院,武汉430056

出　　处：《工程爆破》2023年第4期35-42,共8页Engineering Blasting

基　　金：湖北省自然科学基金资助项目(2019CFB224);湖北省教育厅资助项目(Q201913308);荆州市科技局资助项目(2019Z18001);爆破工程湖北省重点实验室开放基金资助项目(HKLBEF202011)。

摘　　要：为了研究爆破地震波在上土下岩地层中传播的曲率对地表振动的影响,选取爆破地震波中的柱面SH波作为研究对象,基于弹性地震波理论与积分变换方法,建立了单层、多层层状地层的刚度矩阵和动力平衡方程。并以武汉宝通寺地铁站爆破开挖为工程背景,分析了地表速度与土岩地层界面速度的比值(|v_(0)/v_(1)|)与土层厚度和震源深度等参数的关系。结果表明:上土下岩地层中,当入射波频率大于30 Hz时,土层对距震距200 m处的地表振动速度具有明显的放大作用,土层越厚,土层的放大效应越小;而随着震中距的增加,土层呈现出过滤高频波的作用;随着震源深度增加,土层的放大效应逐渐减小;当震源深度在10~15 m时,可把柱面SH波简化为平面波作用。In order to study the effect of the curvature of blasting seismic wave propagation in the upper soil and lower rock strata on surface vibration,the cylindrical SH wave in blasting seismic wave was selected as the research object,and the stiffness matrix and dynamic balance equation of single-layer and multi-layer layered strata were established based on elastic seismic wave theory and integral transformation method.Taking the blasting and excavation construction of Wuhan Baotongsi subway station as the background,the relationship between the ratio(|v_(0)/v_(1)|)of surface velocity to soil-rock-stratum interface velocity and parameters such as soil thickness and focal depth is analyzed.The results show:In the upper-soil-lower-rock stratum,when the incident wave frequency is greater than 30 Hz,the soil layer has an obvious amplification effect on the surface vibration velocity at a distance of 200 m from the seismic distance,and the thicker the soil layer is,the smaller the amplification effect of the soil layer is;with the increase of the epicentral distance,the soil layer exhibits the role of filtering high-frequency waves;with the increase of the depth of the source of the seismic source,the amplification effect of the soil layer decreases;when the depth of the source of the seismic source is in the range of 10-15 m,the columnar surface SH wave can be simplified to the role of the plane wave.

关 键 词：爆破地震波 柱面SH波 积分变换 上土下岩 动力刚度矩阵 

分 类 号：TD235[矿业工程—矿井建设]