土钉拉拔过程模拟幻灯片.pdfVIP

土钉拉拔过程模拟# 1 2* 马崇武 ，刘忠玉 （1. 东莞理工学院 建筑工程系，广东 东莞 523808； 5 2. 郑州大学 土木工程学院，河南 郑州 450001 ） 摘要：用双曲线模型描述土钉周围的摩擦剪应力与剪切位移之间的关系，假定土钉和周围土 体的界面强度服从摩尔-库仑准则，并考虑其剪胀性，推导了拉拔过程中土钉位移应满足的 微分方程，并用有限差分法进行了求解，模拟了端部位移随拉拔力增加而变化的过程。通过 10 与室内模型试验的对比，证明了本文方法的有效性，并证明计算土钉抗拔承载力时考虑钉土 界面剪胀性的必要性。 关键词：基础工程；土钉；抗拔；剪胀性；模拟；有限差分 中图分类号：TU432 15 Simulation of pulling out of soil nail 1 2 MA Chongwu , LIU Zhongyu (1. Department of Civil Engineering, Dongguan University of Technology, Dongguan, 523808, China; 2. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China) 20 Abstract: The hyperbolic model was introduced to describe the relationship between the friction shear stress and the relative shear displacement at the interface between the soil nail and its surrounding soils. Based on the assumpution that the poll-out resistance of the nail follows the Mohr-Coulomb criterion and considering the soil dilatancy effects, the differential equation of dislpacement was derived and its numerical solution was obtained by using the finite difference 25 method. Then the pull-out process was simulated. The results of the proposed model are in good agreement with results of pullout tests, which illustrated that the dilatancy of the soil-nail interface should be taken into account of estimating its pull-out bearing capacity. Key words: foundation engineering; soil nail; pull-out; dilatancy; simulation; finite difference 30 0 引言 由于土钉墙是当前应用比较广泛的一种基坑支护形式，所以土钉的抗拔机理或抗拔特性 研究一直受到大家的重视，特别是在土钉抗拔承载力和钉土界面摩阻力方面已有不少学者进