玻璃纤维增强聚合物抗浮锚杆的临界锚固长度计算
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摘要
考虑到抗浮锚杆的工作机理与抗拔桩相似的特性,基于理想同心薄壁圆柱体剪切模型及抗浮锚杆剪应力分布简化模型,推导出玻璃纤维增强聚合物(GFRP)抗浮锚杆的临界锚固长度的解析式,并以工程实例检验该方法的合理性。研究结果表明:提出的GFRP抗浮锚杆临界锚固长度解析计算方法是可行的,将理论临界锚固长度的2/3作为GFRP抗浮锚杆实际锚固长度参考值,可以在保证承载性能的前提下提高材料利用率。GFRP抗浮锚杆临界锚固长度理论值随锚杆杆体-岩土体弹性模量比值的增大而增大,但在该比例逐渐变大的过程中,临界锚固长度增长幅度逐渐降低。此外,增加杆体半径亦可提高理论临界锚固长度。研究结果可为GFRP抗浮锚杆的推广使用提供理论依据与实践参考。
Considering the comparability for the working mechanism of anti-floating anchor and uplift pile,we deduced the analytical function for critical anchorage length of glass fiber reinforced polymer( GFRP) anti-floating anchor based on the concentric thin-walled cylinder shear model and simplified shear stress distributional model of the anti-floating anchor. The rationality of the method mentioned above was also examined in some engineering projects.The results show that the analytical method for calculating the critical anchorage length of GFRP anti-floating anchor is feasible,and 2/3 of the theoretical critical anchorage length is taken as the reference value of the actual anchorage length of GFRP floating anchor,which can improve the material utilization and guarantee the bearing capacity at the same time. The theoretical critical anchorage length of GFRP anti-floating anchor will increase with the increase of the elasticity modulus ratio of the anchor bolt and rock-soil mass. During the process of the promotion of the ratio,the increased amplitude of the critical anchorage length will reduce gradually. Additionally,the theoretical critical anchorage length will also increase with the increase of the anchor bolt radius. The research results could provide the theoretical foundation and practice reference for the application of GFRP anti-floating anchor.
Considering the comparability for the working mechanism of anti-floating anchor and uplift pile,we deduced the analytical function for critical anchorage length of glass fiber reinforced polymer( GFRP) anti-floating anchor based on the concentric thin-walled cylinder shear model and simplified shear stress distributional model of the anti-floating anchor. The rationality of the method mentioned above was also examined in some engineering projects.The results show that the analytical method for calculating the critical anchorage length of GFRP anti-floating anchor is feasible,and 2/3 of the theoretical critical anchorage length is taken as the reference value of the actual anchorage length of GFRP floating anchor,which can improve the material utilization and guarantee the bearing capacity at the same time. The theoretical critical anchorage length of GFRP anti-floating anchor will increase with the increase of the elasticity modulus ratio of the anchor bolt and rock-soil mass. During the process of the promotion of the ratio,the increased amplitude of the critical anchorage length will reduce gradually. Additionally,the theoretical critical anchorage length will also increase with the increase of the anchor bolt radius. The research results could provide the theoretical foundation and practice reference for the application of GFRP anti-floating anchor.
引文
1贾金青,宋二祥.滨海大型地下工程抗浮锚杆的设计与试验研究[J].岩土工程学报,2002,24(6):769-771Jia Jinqing,Song Erxiang.The design and test on anti-floating anchorage of large substructure in coastal region[J].Chinese Journal of Geotechnical Engineering,2002,24(6):769-771
2 Ashrafi H,Bazli M,Vatani Oskouei A,et al.Effect of sequential exposure to UV radiation and water vapor condensation and extreme temperatures on the mechanical properties of GFRP bars[J].Journal of Composites for Construction,2017,22(1):04017047
3 Karbhari V M,Chin J W,Hunston D,et al.Durability gap analysis for fiber-reinforced polymer composites in civil infrastructure[J].Journal of Composites for Construction,2003,7(3):238-247
4 Xu D,Yin J.Analysis of excavation induced stress distributions of GFRP anchors in a soil slope using distributed fiber optic sensors[J].Engineering Geology,2016,213:55-63
5白晓宇,张明义,朱磊,等.全长黏结GFRP抗浮锚杆界面剪切特性试验研究[J].岩石力学与工程学报,2018,37(6):1407-1418Bai Xiaoyu,Zhang Mingyi,Zhu Lei,et al.Experimental study on shear characteristics of interface of full-bonding glass fiber reinforced polymer anti-floating anchors[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(6):1407-1418
6李国维,于威,李峰,等.引江济淮软岩钢筋、GFRP筋锚杆承载差异试验[J].岩石力学与工程学报,2018,37(3):601-610Li Guowei,Yu Wei,Li Feng,et al.Experiment on the difference of load bearing of GFRP and steel bars in soft-rock slopes of water diversion from Yangtze to Huai[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(3):601-610
7李国维,郑诚,陈圣刚,等.引江济淮软岩全黏结GFRP筋锚固蜕化现场实验[J].水利学报,2017,48(7):825-836Li Guowei,Zheng Cheng,Chen Shenggang,et al.Bond degeneration of fully grouted GFRP bar in submerged soft rock in diversion of water from Changjiang River to Huaihe River[J].Journal of Hydraulic Engineering,2017,48(7):825-836
8 Cooke R W,Price G.Strains and displacements around friction piles[C]//Proceedings of the Eighth International Conference on Soil Mechanics and Foundation Engineering.Moscow:Building Research Station,1973:53-60
9 Randolph M F,Wroth C P.Analysis of deformation of vertically loaded piles[J].Journal of Geotechnical and Geoenvironmental Engineering,1978,104(12):465-488
10黄锋,李广信.砂土中抗拔桩位移变形的分析[J].土木工程学报,1999,32(1):31-36Huang Feng,Li Guangxin.Analysis of deformation of tension piles in sandy soil[J].Chinese Journal of Geotechnical Engineering,1999,32(1):31-36
11 Cooke R W,Prince G,Tarr K J.Jacked pile in London clay:Astudy of load transfer and settlement under working conditions[J].Geotechnique,1979,29(2):113-147
12白晓宇,张明义,闫楠.两种不同材质抗浮锚杆锚固性能的现场对比试验研究与机理分析[J].土木工程学报,2015,48(8):38-46Bai Xiaoyu,Zhang Mingyi,Yan Nan.Field contrast test and mechanism analysis on anchorage performance of anti-floating anchors with two different materials[J].China Civil Engineering Journal,2015,48(8):38-46
13白晓宇,张明义,寇海磊.基于裸光纤光栅传感技术GFRP抗浮锚杆荷载传递机制的原位试验研究[J].工程力学,2015,32(8):172-181Bai Xiaoyu,Zhang Mingyi,Kou Hailei.Field experimental study of load transfer mechanism of GFRP anti-floating anchors based on embedded bare fiber bragg grating sensing technology[J].Engineering Mechanics,2015,32(8):172-181
14 Kou H,Guo W,Zhang M.Pullout performance of GFRP anti-floating anchor in weathered soil[J].Tunnelling and Underground Space Technology,2015,49:408-416
15匡亚川,徐杨,欧练文.玻璃纤维增强塑料锚杆粘结性能研究[J].哈尔滨工程大学学报,2016,37(12):1658-1664Kuang Yachuan,Xu Yang,Ou Lianwen.Research on the bond behavior of a glass-fiber-reinforced plastic bolt[J].Journal of Harbin Engineering University,2016,37(12):1658-1664
16尤春安.全长粘结式锚杆的受力分析[J].岩石力学与工程学报,2000,19(3):339-341You Chunan.Mechanical analysis of fully-grouted anchor[J].Chinese Journal of Rock Mechanics and Engineering,2000,19(3):339-341
17 Won J P,Park C G,Kim H H,et al.Effect of fibers on the bonds between FRP reinforcing bars and high-strength concrete[J].Composites Part B:Engineering,2008,39(5):747-755
18 Seed H B,Reese L C.The action of soft clay along friction piles[J].Transactions of the American Society of Civil Engineers,1900,122:731-754
19张洁,尚岳全,叶彬.锚杆临界锚固长度解析计算[J].岩石力学与工程学报,2005,24(7):1134-1138Zhang Jie,Shang Yuequan,Ye Bin.Analytical calculations of critical anchorage length of bolts[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(7):1134-1138
20付文光,柳建国,杨志银.抗浮锚杆及锚杆抗浮体系稳定性验算公式研究[J].岩土工程学报,2014,36(11):1971-1982Fu Wenguang,Liu Jianguo,Yang Zhiyin.Formulae for calculating stability of anti-floating anchor and anchor anti-floating system[J].Chinese Journal of Geotechnical Engineering,2014,36(11):1971-1982
2 Ashrafi H,Bazli M,Vatani Oskouei A,et al.Effect of sequential exposure to UV radiation and water vapor condensation and extreme temperatures on the mechanical properties of GFRP bars[J].Journal of Composites for Construction,2017,22(1):04017047
3 Karbhari V M,Chin J W,Hunston D,et al.Durability gap analysis for fiber-reinforced polymer composites in civil infrastructure[J].Journal of Composites for Construction,2003,7(3):238-247
4 Xu D,Yin J.Analysis of excavation induced stress distributions of GFRP anchors in a soil slope using distributed fiber optic sensors[J].Engineering Geology,2016,213:55-63
5白晓宇,张明义,朱磊,等.全长黏结GFRP抗浮锚杆界面剪切特性试验研究[J].岩石力学与工程学报,2018,37(6):1407-1418Bai Xiaoyu,Zhang Mingyi,Zhu Lei,et al.Experimental study on shear characteristics of interface of full-bonding glass fiber reinforced polymer anti-floating anchors[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(6):1407-1418
6李国维,于威,李峰,等.引江济淮软岩钢筋、GFRP筋锚杆承载差异试验[J].岩石力学与工程学报,2018,37(3):601-610Li Guowei,Yu Wei,Li Feng,et al.Experiment on the difference of load bearing of GFRP and steel bars in soft-rock slopes of water diversion from Yangtze to Huai[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(3):601-610
7李国维,郑诚,陈圣刚,等.引江济淮软岩全黏结GFRP筋锚固蜕化现场实验[J].水利学报,2017,48(7):825-836Li Guowei,Zheng Cheng,Chen Shenggang,et al.Bond degeneration of fully grouted GFRP bar in submerged soft rock in diversion of water from Changjiang River to Huaihe River[J].Journal of Hydraulic Engineering,2017,48(7):825-836
8 Cooke R W,Price G.Strains and displacements around friction piles[C]//Proceedings of the Eighth International Conference on Soil Mechanics and Foundation Engineering.Moscow:Building Research Station,1973:53-60
9 Randolph M F,Wroth C P.Analysis of deformation of vertically loaded piles[J].Journal of Geotechnical and Geoenvironmental Engineering,1978,104(12):465-488
10黄锋,李广信.砂土中抗拔桩位移变形的分析[J].土木工程学报,1999,32(1):31-36Huang Feng,Li Guangxin.Analysis of deformation of tension piles in sandy soil[J].Chinese Journal of Geotechnical Engineering,1999,32(1):31-36
11 Cooke R W,Prince G,Tarr K J.Jacked pile in London clay:Astudy of load transfer and settlement under working conditions[J].Geotechnique,1979,29(2):113-147
12白晓宇,张明义,闫楠.两种不同材质抗浮锚杆锚固性能的现场对比试验研究与机理分析[J].土木工程学报,2015,48(8):38-46Bai Xiaoyu,Zhang Mingyi,Yan Nan.Field contrast test and mechanism analysis on anchorage performance of anti-floating anchors with two different materials[J].China Civil Engineering Journal,2015,48(8):38-46
13白晓宇,张明义,寇海磊.基于裸光纤光栅传感技术GFRP抗浮锚杆荷载传递机制的原位试验研究[J].工程力学,2015,32(8):172-181Bai Xiaoyu,Zhang Mingyi,Kou Hailei.Field experimental study of load transfer mechanism of GFRP anti-floating anchors based on embedded bare fiber bragg grating sensing technology[J].Engineering Mechanics,2015,32(8):172-181
14 Kou H,Guo W,Zhang M.Pullout performance of GFRP anti-floating anchor in weathered soil[J].Tunnelling and Underground Space Technology,2015,49:408-416
15匡亚川,徐杨,欧练文.玻璃纤维增强塑料锚杆粘结性能研究[J].哈尔滨工程大学学报,2016,37(12):1658-1664Kuang Yachuan,Xu Yang,Ou Lianwen.Research on the bond behavior of a glass-fiber-reinforced plastic bolt[J].Journal of Harbin Engineering University,2016,37(12):1658-1664
16尤春安.全长粘结式锚杆的受力分析[J].岩石力学与工程学报,2000,19(3):339-341You Chunan.Mechanical analysis of fully-grouted anchor[J].Chinese Journal of Rock Mechanics and Engineering,2000,19(3):339-341
17 Won J P,Park C G,Kim H H,et al.Effect of fibers on the bonds between FRP reinforcing bars and high-strength concrete[J].Composites Part B:Engineering,2008,39(5):747-755
18 Seed H B,Reese L C.The action of soft clay along friction piles[J].Transactions of the American Society of Civil Engineers,1900,122:731-754
19张洁,尚岳全,叶彬.锚杆临界锚固长度解析计算[J].岩石力学与工程学报,2005,24(7):1134-1138Zhang Jie,Shang Yuequan,Ye Bin.Analytical calculations of critical anchorage length of bolts[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(7):1134-1138
20付文光,柳建国,杨志银.抗浮锚杆及锚杆抗浮体系稳定性验算公式研究[J].岩土工程学报,2014,36(11):1971-1982Fu Wenguang,Liu Jianguo,Yang Zhiyin.Formulae for calculating stability of anti-floating anchor and anchor anti-floating system[J].Chinese Journal of Geotechnical Engineering,2014,36(11):1971-1982