土钉拉拔过程数值模拟

复合材料科学与工程 ›› 2013, Vol. 0 ›› Issue (8): 12-15.

土钉拉拔过程数值模拟

马崇武^1*, 刘忠玉²

1.东莞理工学院建筑工程系,广东东莞 523808;
2.郑州大学土木工程学院,河南郑州 450001

收稿日期:2013-01-18 出版日期:2013-11-28 发布日期:2022-03-22
作者简介:马崇武(1965-),男,博士,教授,主要从事环境与基础工程中的力学问题研究,machongwu@126.com。
基金资助:
广东省科技计划项目(2007B060401021); 东莞市科技计划项目(2008108101025)

NUMERICAL SIMULATION OF PULLING OUT OF SOIL NAIL

MA Chong-wu^1*, LIU Zhong-yu²

1. Department of Civil Engineering, Dongguan University of Technology, Dongguan 523808, China;
2. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China

Received:2013-01-18 Online:2013-11-28 Published:2022-03-22

摘要/Abstract

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。通过与砂浆黏结玻璃纤维增强塑料(GFRP)土钉室内模型试验的对比,证明了本文方法的有效性,以及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, 玻璃纤维增强塑料, 抗拔, 剪胀性, 模拟, 有限差分

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 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, glass fiber reinforced polymer(GFRP), pull-out, dilatancy, simulation, finite difference

中图分类号:

马崇武, 刘忠玉. 土钉拉拔过程数值模拟[J]. 复合材料科学与工程, 2013, 0(8): 12-15.

MA Chong-wu, LIU Zhong-yu. NUMERICAL SIMULATION OF PULLING OUT OF SOIL NAIL[J]. COMPOSITES SCIENCE AND ENGINEERING, 2013, 0(8): 12-15.

参考文献

[1] 王建党,贾立宏,秦四清等. 深基坑土钉支护抗拔机理[J]. 东北大学学报(自然科学版),1999,20(1): 71-74.
[2] 何颖成,邵小红,张晓鹏等. 土钉支护抗拔力研究[J]. 四川建筑科学研究,2003,29(3): 90-92.
[3] 丁振明,秦四清,刘军等. 土钉支护体系抗拔力机理研究[J]. 岩土力学,2005,26(11): 1799-1802.
[4] 郭院成,秦会来,李峰. 土钉支护中土钉力的计算方法[J]. 岩土工程学报,2006,28(增): 1513-1516.
[5] 贺若兰,张平,李宁. 土钉支护加固机理的数值分析[J]. 湖南大学学报(自然科学版),2007,34(1): 14-19.
[6] 张敏健,应惠清. 土钉的抗拔性能试验研究[J]. 建筑施工, 2005,27(4): 19-20.
[7] 李典庆,常晓林. 土钉抗拔试验对粘结强度估计的影响[J]. 四川大学学报(工程科学版),2006,38(3): 17-23.
[8] 陆益成,薛艳. 土钉抗拔承载力的原位试验研究[J]. 江苏地质,2008,32(2): 133-136.
[9] Pradhan B,Tham L G,Yue Z Q. Soil-nail pullout interaction in loose fill maturials[J]. International Journal of Geomechanics, ASCE,2006,6(4): 238-247.
[10] Liu Z Y,Ma C W,Zhao Z. Laboratory experimental study on pullout behavior of mortar grouted GFRP soil nails[J]. Advanced Materials Research,2011,168-170: 1069-1072.
[11] 马崇武,刘忠玉,周高永. 砂浆粘结GFRP 土钉抗拔承载力室内试验研究[J]. 郑州大学学报: 工学版,2011,32(2): 71-74.
[12] Wang Z,Richwien W. A Study of Soil-Reinforcement Interface Friction[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2002,128(1): 92-94.
[13] 马崇武,刘忠玉,周高永. 考虑剪胀效应的土钉抗拔承载力计算[J]. 东莞理工学院学报,2010,17(1): 83-87.
[14] Clough G W,Duncan J M. Finite-element analyses of retaining wall behavior[J]. Journal of the Soil Mechanics Foundation Division, 1971,97(12): 1653-1673.
[15] 朱坤宁,万水. GFRP 桥面铺装力学特性研究[J]. 玻璃钢/复合材料,2011, (5): 35-40.
[16] 黄志怀,李国维,李玉起. 不同直径GFRP 锚杆承载特征的现场对比试验[J]. 玻璃钢/复合材料,2010, (1): 24-27.
[17] 黄志怀,李国维. 玻璃纤维增强塑料锚杆设计研究[J]. 玻璃钢/复合材料,2008, (4): 36-40.
[18] Vermeer P A. The otientation of shear bands in biaxial tests[J]. Geotechnique,1990,40(2): 223-236.