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.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2002年第1期85-89,共5页
Rock and Soil Mechanics
关键词
土钉支护
弹塑性
数值分析
稳定性
soil nailing
3D elastoplastic FEM
strength reduction technique
stability
