非剪胀土体中土钉室内拉拔有限元模拟

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	英文篇名：Finite Element Simulation of Laboratory Pull-out Test of Soil Nail in Non-dilative Soils 作者：刘川川 ; 张捷 ; 吴鸣 英文作者：Liu Chuanchuan;Zhang Jie;Wu Ming; 关键词：土钉 ; 抗拔承载力 ; 有限元模拟 英文关键词：soil nail;;pullout capacity;;Finite element simulation 中文刊名：CQJZ 英文刊名：Chongqing Architecture 机构：汕头大学土木与环境工程系; 出版日期：2019-06-25 出版单位：重庆建筑 年：2019 期：v.18;No.188 语种：中文; 页：CQJZ201906014 页数：4 CN：06 ISSN：50-1150/U 分类号：38-41

摘要

该文通过在土钉与土体间建立薄层剪切单元的方式,利用ABAQUS有限元软件对土钉室内拉拔试验过程进行了有限元模拟,模拟结果显示,在土钉上覆压力较大的情况下,对于松散土体,忽略钻孔过程的模拟方法相对于考虑钻孔过程的模拟方法得到的模拟结果与实际室内试验结果更为接近,并且剪切带单元厚度的差异不会影响模拟结果。另外,该文对不同内摩擦角土体下土钉的拉拔过程进行了有限元模拟,并以模拟结1+k果对计算土钉抗拔承载力的两个经验表达式进行了合理性验证与评价,结果表明以(1+k_0)/2σ'_v为法向应力的表达式相比于以σ'_ν为法向应力的表达式更具有合理性。
        In this paper, the finite element simulation of the laboratory pull-out test of soil nails was carried out by using ABAQUS finite element software to establish a thin-layer shearing unit between soil nails and soils. The simulation results revealed that for the loose soils the simulation results obtained with the method neglecting the drilling process was much closer to the laboratory results than that with the method considering the drilling process under the condition where soil nails had relatively huge overburden pressure, and the difference in unit thickness of the shearing zone had little influence on the simulation results. Furthermore, finite element simulations of laboratory pullout process of soil nails in soils with different internal friction angles were conducted and the simulation results were used to verify and assess the two commonly used empirical expressions for calculating the pullout capacity of soil nail. The results implied that the expression with (1+k_0)/2σ'_v as the normal stress was more reasonable than that with σ'_v as the normal stress

引文

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