水平向地震力作用下裂缝二次开裂研究  

Study on Secondary Cracking of Cracks under Horizontal Seismic Force

作　　者：范方方[1] 李健[1] 宋文智 张飞[3,4] FAN Fangfang;LI Jian;SONG Wenzhi;ZHANG Fei(CCCC Second Highway Consultants Co.,Ltd,Wuhan 430056,China;Shanghai Ershiye Construction Co.,Ltd.,Shanghai 201999,China;MOE Key Laboratory of Geomechanics an Embankment Engineering,Hohai University,Nanjing 210098,China;Geotechnical Research Institute,College of Civil and Transportation,Hohai University,Nanjing 210098,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,湖北武汉430056 [2]上海二十冶建设有限公司,上海201999 [3]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [4]河海大学土木与交通学院岩土工程研究所,江苏南京210098

出　　处：《防灾减灾工程学报》2021年第5期1113-1119,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金面上项目(51878248)资助。

摘　　要：针对水平向地震力作用下发生裂缝二次开裂问题,提出了平面应变下均质土坡二次开裂坡脚破坏模型和坡底破坏模型。考虑水平向地震力系数、边坡坡度和土体内摩擦角的影响,计算了不同裂缝距坡肩距离和不同已开裂裂缝深度下临界高度和二次开裂深度,绘制了相关的图表。已开裂裂缝深度越大,则临界高度越小,裂缝二次开裂深度越小;具有相同土性参数和边坡坡度但已开裂深度不同的均质土坡,在相同的水平向地震力作用下发生二次开裂,两次开裂的深度之和近似相等。Aiming at the problem of secondary cracking under horizontal seismic forces,a model describing the toe failure and base failure of a homogeneous soil slope with secondary cracking under a plane strain condition is proposed.Considering the influence of horizontal seismic force coefficient,slope gradient,and friction angle in soil,the critical height and secondary cracking depth for various crack distances from the slope shoulder and cracking depth are calculated,and the relevant charts are drawn.The larger the crack depth is,the smaller the critical height is and the smaller the secondary crack depth is.For homogeneous soil slopes with the same soil parameters and slope gradient but different crack depths,secondary cracks will develop under the same horizontal seismic force,and the sum of the two cracks is approximately the same.

关 键 词：均质土坡 裂缝 二次开裂 极限分析 上限解 地震 

分 类 号：TU435[建筑科学—岩土工程]