土钉支护弹塑性数值分析及稳定性探讨  

Elastoplastic numerical analysis and stability study of soil-nailed wall

作　　者：连镇营[1] 韩国城[2] 吕凯歌[1] 

机构地区：[1]中国建筑科学研究院地基基础研究所,北京100013 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《岩土力学》2002年第1期85-89,共5页Rock and Soil Mechanics

摘　　要：用三维弹塑性有限元法对土钉支护进行了边开挖、边安装土钉和喷射混凝土面层的施工过程的数值模拟分析。通过一种强度折减技术探讨了土钉支护的稳定性。研究结果表明,施工过程中在不同的使用荷载作用下受力最大的土钉并不是一成不变的,因此,在土钉支护工程中不能随意地缩短某层土钉的长度。数值计算确定的潜在滑裂区和局部破坏区符合实际情况,认为钉体拔出是土钉支护最可能出现的内部失稳形式。A3D elastoplastic FEM is used to analyze the behavior of a soil-nailed wall.The complete sequence of construction is simulated,including the excavation of soil and the placement of the nails and shotcretes.The stability of slope is studied by a shear strength reduction technique.The conclusion can be drawn that the nail,whose tensile stress is the maximum in the nails,changes during the construction and under the different service loads.The length of nail can not be shortened arbitrarily in the actual engineering.The slip surface and local failure zone obtained by the strength reduction technique better reflect the true condition.Pull-out of nails is highly possible in the internal failure forms of soil nailing.

关 键 词：土钉支护 弹塑性 数值分析 稳定性 

分 类 号：TU753.8[建筑科学—建筑技术科学]