锚杆长度与边坡坡率对最优锚固角的影响

林杭; 钟文文; 熊威; 唐雯钰; 曹平

doi:10.11779/CJGE2014S2002

锚杆长度与边坡坡率对最优锚固角的影响 English Version

林杭^{1, 2, 3},
钟文文¹,
熊威¹,
唐雯钰¹,
曹平¹

1. 中南大学资源与安全工程学院,湖南长沙 410083;
2. 山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室,山西太原 030006;
3. 西部灾害与环境力学教育部重点实验室（兰州大学）,甘肃兰州 730000

基金项目: 国家自然科学基金项目（51304240）; 黄土地区公路建设与养护技术交通行业重点实验室开放基金项目（KLTLR-Y13-14）; 西部灾害与环境力学教育部重点实验室开放基金项目（201201）

详细信息

作者简介:
林杭(1980- ),男,福建福州人,博士,副教授,主要从事岩石力学与岩土工程数值计算的研究。E-mail: linhangabc@126.com。

计量
- 文章访问数: 435
- HTML全文浏览量: 5
- PDF下载量: 356
出版历程
- 收稿日期: 2014-07-27
- 发布日期: 2014-07-27

Effect of bolt length and slope rate on optimum anchorage angle

1. School of Resources &
Safety Engineering, Central South University, Changsha, 410083, China;
2. Key Laboratory of Highway Construction &
Maintenance Technology in Loess Region, Shanxi Transportation Research Institute, Taiyuan 030006, China;
3. Key Laboratory of Mechanics on Disaster and Environment in Western China (Lanzhou University), Ministry of Education, Lanzhou 730000, China

摘要

摘要: 最优锚固角是锚固工程设计中的重要参数,为了探讨锚杆长度和边坡坡率对于锚杆最优锚固角的影响,采用FLAC3D数值方法,建立边坡模型,通过数值计算发现锚杆长度和边坡坡率对最优锚固角影响较大,研究结果表明：①边坡安全系数随锚杆长度的增大呈现先增大后基本保持不变的趋势,存在有效锚固长度,锚杆倾角越大对应的有效锚固长度越小。②边坡安全系数随锚杆倾角的增大呈现先增大后减小的趋势,存在最优锚固角;并且最优锚固角随锚杆长度的增大而线性减小。③当锚杆倾角未达到最优锚固角之前,边坡坡率对安全系数影响较小,而当锚杆倾角达到或者超过最优锚固角,边坡坡率的影响逐渐显现,并且坡率越大所对应的最优锚固角也越大。
- 数值分析 /
- 安全系数 /
- 锚固角 /
- 锚杆长度 /
- 边坡坡率
Abstract: The optimum anchorage angle is the important parameter in the design of anchoring engineering. In order to study the effect of bolt length and slope rate on the optimum anchorage angle, a numerical model for slopes is established using FLAC^3D. It is found that the anchor length and the slope rate have great influence on the optimum anchorage angle. The results show that: (1) With the increase of anchor length, the factor of safety decreases at first and then remains stable, so there exists an effective length. The effective length decreases with the increase of anchorage angle. (2) The increase of anchorage angle will lead to the safety factor first to increase and then decrease, so there exists an optimum anchorage angle. The optimum anchorage angle will decrease linearly with the increase of bolt length. (3) When the anchorage angle is less than the optimum anchorage angle, the slope rate only has small impact on the safety factor. When the anchorage angle is the same as the optimum anchorage angle or larger than the optimum anchorage angle, the impact of the slope rate on the slope stability becomes more obviously, and the larger slope rate leads to the larger optimum anchorage angle.
- numerical analysis /
- safety factor /
- anchorage angle /
- bolt length /
- slope rate

HTML全文

参考文献(14)

[1]	熊智彪, 王启云. 某复杂平面基坑支护结构水平位移监测及加固[J]. 岩土力学, 2009, 30(2): 572-576. (XIONG Zhi-biao, WANG Qi-yun. Monitoring horizontal displacements of support structure for a complicated planar foundation pit and its reinforcement[J]. Rock and Soil Mechanics, 2009, 30(2): 572-576. (in Chinese))
[2]	林杭, 曹平. 锚杆长度对边坡稳定性影响的数值分析[J]. 岩土工程学报, 2009, 31(3): 470-474. (LIN Hang, CAO Ping. Numerical analysis for the effect of cable length to the stability of slope[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(3): 470-474. (in Chinese))
[3]	马平, 申平, 秦四清, 等. 深基坑桩锚与土钉墙联合支护的数值模拟[J]. 工程地质学报, 2008, 16(3): 114-120. (MA Ping, SHEN Ping, QIN Si-qing, LIU Hongyan Numerical simulation of pile-anchor and soil nailing wall composite support structure in foundation pit[J]. Journal of Engineering Geology, 2008, 16(3): 114-120. (in Chinese))
[4]	杨庆, 朱训国, 栾茂田. 全长注浆岩石锚杆双曲线模型的建立及锚固效应的参数分析[J]. 岩石力学与工程学报, 2007, 26(4): 692-698. (YANG Qing, ZHU Xun-guo, LUAN Mao-tian. Development of hyperbolic model for fully grouting rock bolt and parameters analsis for anchoring effect[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(4): 692-698. (in Chinese))
[5]	泮晓华, 薛雷, 涂杰楠, 等. 深基坑疏排桩锚与土钉墙水平联合支护数值模拟[J]. 工程勘察, 2010(11): 1-5. (PAN Xiao-hua, XUE Lei, TU Jie-nan, WANG Yuan-yuan, HAN Chao. Numerical simulation of scattered row pile-anchor and soil-nailed wall level composite support in deep foundation pit[J]. Journal of Geotechnical Investigation & Surveying, 2010(11): 1-5. (in Chinese))
[6]	郭小红, 王梦恕. 隧道支护结构中锚杆的功效分析[J]. 岩土力学, 2007, 28(10): 2234-2239. (GUO Xiao-hong, WANG Meng-shu. Analysis of efficacy of rock bolt for tunnel support stucture[J]. Rock and Soil Mechanics, 2007, 28(10): 2234-2239. (in Chinese))
[7]	CAI F, UGAI K. Reinforcing mechanism of anchors in slopes: A numerical comparison of results of LEM and FEM[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2003, 27(7): 549-564.
[8]	彭文祥, 赵明华, 袁海平, 等. 基于拉格朗日差分法的全长注浆锚杆支护参数优化[J]. 中南大学学报(自然科学版), 2006, 37(5): 1002-1007. (PENG Wen-xiang, ZHAO Ming-hua, YUAN Hai-ping, et al. Parameters analysis of grouted bolts by Lagrangian difference method[J]. Journal of Central South University, 2006, 37(5): 1002-1007. (in Chinese))
[9]	蒋明杰. 锚杆（索）最佳锚固角的取值分析[J]. 勘察科学技术, 2013(3): 29-31. (JIANG Ming-jie. Analysis on optimum anchorage angle of anchoring bars (ropes)[J]. Site Investigation Science and Technology, 2013(3): 29-31. (in Chinese))
[10]	贺若兰, 张平, 刘宝琛. 锚杆拉拔试验的理论和数值分析[J]. 岩土力学, 2006, 27(增刊2): 855-859. (HE Ruo-lan, ZHANG Ping, LIU Bao-chen. Theoretical and numerical analysis of bolt pull-out test[J]. Rock and Soil Mechanics, 2006, 27(S2): 855-859. (in Chinese))
[11]	IMRE B. Numerical slope stability simulations of the northern wall of eastern Candor Chasma (Mars) utilizing a distinct element method[J]. Planetary and Space Science, 2004, 52(14): 1303-1319.
[12]	刘金龙. 边坡稳定性及路堤变形与破坏机制研究[J]. 岩石力学与工程学报, 2007, 26(7): 1511. (LIU Jin-long. Study on stability of slope and mechanisms of deformation and failure of embankment[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(7): 1511. (in Chinese))
[13]	Itasca Consulting Group. Fast lagrangian analysis of continua in 3 dimensions, User Manual, Version 3.1[M]. Minnesota: Minnesota: Itasca Consulting Group, 2004.
[14]	张鲁渝, 郑颖人, 赵尚毅, 等. 有限元强度折减系数法计算土坡稳定安全系数的精度研究[J]. 水利学报, 2003(1): 21-27. (ZHANG Lu-yu, ZHENG Ying-ren, ZHAO Shang-yi, et al. The feasibility study of strength-reduction method with FEM for calculating safety factors of soil slope stability[J]. Journal of Hydraulic Engineering, 2003(1): 21-27. (in Chinese))