冲击荷载作用下黄土边坡动力响应试验研究  

Field Test of Dynamic Response of Loess Slope Under Impact Load

作　　者：武朝强 娄国充 陈松[1] 宋杨 Wu Chaoqiang;Lou Guochong;Chen Song;Song Yang(Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043

出　　处：《石家庄铁道大学学报（自然科学版）》2023年第1期33-40,共8页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：河北省重点研发计划项目(19274207D)。

摘　　要：为了探究强夯荷载作用下黄土边坡动态性能,以甘肃庆阳某在建机场黄土边坡为研究对象,针对机场站坪填方区和开挖区开展现场振动监测试验,研究了冲击荷载作用下不同边坡的动力响应。研究结果表明,相同夯击能作用下,夯击次数对各测点振动速度影响不大,边坡形成方式是影响振动速度的主要原因;相同强夯荷载作用下,填方黄土边坡的振动速度大于开挖原状土边坡;边坡对冲击荷载具有放大效应,填方区黄土边坡放大效应明显,挖方区原状土边坡放大效应不明显,无边坡区域不具放大效应;填方区黄土边坡放大效应位于临近边坡区域,竖向和径向振动速度放大效应更显著;填方区黄土边坡及时施作护坡结构和采取局部压实处理是减小坡体变形和提高稳定性的有效途径。In order to explore the dynamic performance of the loess slope under dynamic ramming load,this paper took the loess slope under construction at an airport in Qingyang,Gansu province as the research object,carried out field vibration monitoring tests for the filling area and excavation area of the airport station,and then studied the dynamic response of different slopes under impact load.The results show that:under the same tamping energy,the number of tamping has little effect on the vibration speed of each measuring point,and the slope formation mode is the main reason affecting the vibration speed;under the same dynamic compaction load,the vibration velocity of the filled loess slope is higher than that of the excavated undisturbed soil slope;the slope has amplification effect on impact load,the amplification effect of filling loess slope is obvious,the amplification effect of excavation undisturbed soil slope is not obvious,and there is no amplification effect in the area without slope;the amplification effect area of fill loess slope is close to the slope surface,and the amplification effect of vertical and radial vibration velocity is more significant;timely construction of slope protection structure and local compaction treatment are effective ways to reduce slope deformation and improve its stability.

关 键 词：黄土边坡 冲击荷载 放大效应 黄土结构 

分 类 号：TU413.5[建筑科学—岩土工程]