带齿墙基础与土体相互作用水平承载特性研究  

Interaction characteristics between shallow foundation with key-wall and soil under horizontal load

作　　者：王蒙 谭慧明[1,2] 陈宁 WANG Meng;TAN Hui-ming;CHEN Ning(Key Laboratory of Coastal Disaster and Defence of Ministry of Education,Hohai University,Nanjing 210024,China;College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210024,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang),Zhanjiang 524013,China)

机构地区：[1]河海大学海岸灾害及防护教育部重点实验室,南京210024 [2]河海大学港口海岸与近海工程学院,南京210024 [3]南方海洋科学与工程广东省实验室(湛江),湛江524013

出　　处：《水道港口》2022年第6期786-794,共9页Journal of Waterway and Harbor

基　　金：国家自然科学基金资助项目(51878247)。

摘　　要：浅基础设置齿墙(坎)后将显著提高其水平承载力,同时也改变了其承载特性。通过开展带齿墙浅基础模型试验和离散元数值模拟,分析了水平荷载作用点高度与齿墙数量对带齿墙浅基础水平承载特性和土体破坏模式的影响。研究结果表明:带齿墙浅基础的荷载-位移曲线和荷载-转角曲线均为陡降型曲线,水平极限承载力随水平荷载作用点高度降低、齿墙数量增加而增加,随着水平荷载作用点高度升高,带齿墙浅基础转动加剧而滑动减小,当水平作用点高度为0.75 B时,带齿墙浅基础以转动破坏为主。随着齿墙数量增加,作用点较低时,模型以滑动破坏为主,模型的水平极限承载力显著增加,作用点较高时,模型以转动破坏为主,齿墙过密相互影响使极限承载力增加不明显。After setting up the key-wall on the shallow foundation, the bearing horizontal capacity will be significantly improved and the bearing characteristics will also be changed. Based on the model test and discrete element numerical simulation of the shallow foundation with key-wall, the influence of the height of the horizontal load point and the number of key-wall on the horizontal bearing characteristics of the shallow foundation with key-wall and the failure mode of the soil were analyzed. The results show that the load-displacement curve and load-rotation curve of the shallow foundation with key-wall are steep-drop curves. The horizontal ultimate bearing capacity increases with the decrease of the height of the action point of horizontal load and the increase of the number of key-wall. With the increase of the height of action point of horizontal load, the rotation of the shallow foundation with key-wall increases and the sliding decreases, when the height of horizontal action point is 0.75 B, the rotational failure of shallow foundation with key-wall is dominant. With the increase of the number of key-wall and the low action point, the main failure mode of the model is sliding failure, and the horizontal ultimate bearing capacity of the model increases significantly. When the action point is high, the main failure mode of the model is rotational failure. The interaction between the key-wall makes the increase of ultimate bearing capacity not obvious.

关 键 词：浅基础 齿墙 水平承载力 粒子图像测速技术 离散元 

分 类 号：U656[交通运输工程—港口、海岸及近海工程]