考虑安装过程影响的吸力贯入式平板锚承载力研究
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摘要
吸力贯入式平板锚是海洋工程中新型锚固基础,但在其安装过程中会产生埋深减少导致承载力下降而影响锚固效果。采用离散单元法对其安装过程和安装后受荷承载进行了全过程模拟,研究了初始埋深,偏心比和锚链拉力倾角三个关键因素对吸力贯入式平板锚承载力的影响。研究结果表明,承载力随初始埋深增大而显著增大,但增幅随埋深的增加而减小,最后趋于稳定;承载力随着偏心比增大而增大,随着锚链拉力倾角的增大而减小,但当初始埋深较大时,两者对承载力均没有影响。研究成果可为吸力贯入式平板锚的施工和设计提供参考。
Suction embedded plate anchor is a new type of anchorage foundation used in marine engineering, but during its installation process, the reduction of burial depth will lead to the decrease of the bearing capacity and affect the anchoring effect. The process of installation and the load bearing capacity after installation were simulated by discrete element method,and the influence of three key factors including the initial depth, the eccentricity ratio and the angle of anchor chain tension on the bearing capacity of suction penetration type plate anchor was studied. The results show that the bearing capacity increases significantly with the increase of initial depth, but the increase decreases with the increase of burial depth, and finally tends to be stable. The bearing capacity increases with the increase of eccentricity ratio and decreases with the increase of inclination angle of anchor chain tension, but when the initial burial depth is large, both have no effect on the bearing capacity.The research results can provide reference for the construction and design of suction embedded plate anchors.
Suction embedded plate anchor is a new type of anchorage foundation used in marine engineering, but during its installation process, the reduction of burial depth will lead to the decrease of the bearing capacity and affect the anchoring effect. The process of installation and the load bearing capacity after installation were simulated by discrete element method,and the influence of three key factors including the initial depth, the eccentricity ratio and the angle of anchor chain tension on the bearing capacity of suction penetration type plate anchor was studied. The results show that the bearing capacity increases significantly with the increase of initial depth, but the increase decreases with the increase of burial depth, and finally tends to be stable. The bearing capacity increases with the increase of eccentricity ratio and decreases with the increase of inclination angle of anchor chain tension, but when the initial burial depth is large, both have no effect on the bearing capacity.The research results can provide reference for the construction and design of suction embedded plate anchors.
引文
[1] YANG M, AUBENY C P, MURFF J D. Behavior of suction embedded plate anchors during keying process[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2012, 138(2):174-183.
[2]王栋.非完全粗糙平板锚旋转安装过程中的丢失埋深[J].岩土力学,2012,33(9):2 765-2 770.WANG Dong. Losses of embedment of non-rough plate anchors during keying[J]. Rock and Soil Mechanics, 2012, 33(9):2 765-2 770.
[3] DAS B M. Model tests for uplift capacity of foundation in clay[J].Soils and Foundation, 1978, 18(2):17-24.
[4] DAS B M. A procedure for estimation of ultimate capacity of foundation in clay[J]. Soils and Foundation,1980, 20(1):77-82.
[5]刘嘉,董志良,郭伟玲.非均质饱和黏土中平板锚基础的抗拉力[J].水运工程,2008(7):1-6.LIU Jia, DONG Zhi-liang, GUO Wei-ling. Uplift capacity of plate anchor foundation in saturated heterogeneous clay[J]. Port&Waterway Engineering, 2008(7):1-6.
[6]王晖,董玉才,李新超.法向承力锚极限抗拔力影响因素的二维有限元分析[J].天津大学学报,2010,43(11):964-970.WANG Hui, DONG Yu-cai, LI Xin-chao. Two-dimensional FEM analysis of influencing factors on ultimate pull-out capacity of vertically loaded anchor[J]. Journal of Tianjin University, 2010, 43(11):964-970.
[7]刘海笑,杨晓亮.法向承力锚极限抗拔力特性[J].海洋工程,2006,24(4):8-14.LIU Hai-xiao, YANG Xiao-liang. Characteristics of ultimate pullout capacity for vertically loaded anchors[J]. The Ocean Engineering, 2006, 24(4):8-14.
[8] MERIFIELD R S, LYAMIN A V, SLOAN S W. Three-dimensional lower-bound solutions for the stability of plate anchors in sand[J].Géotechnique, 2006, 56(2):123-132.
[9] O′LOUGHLIN C D, LOWMASS A, GAUDIN C, et al. Physical modelling to assess keying characteristics of plate anchors[C]//Proceedings of the 6th international conference on physical modelling in geotechnics. 2006(1):659-665.
[10]曹可达,谭慧明,王娇娇,等.吸力贯入式平板锚旋转特性的离散元数值模拟[J].中国科技,2015,10(7):828-833.CAO Ke-da, TAN Hui-ming, WANG Jiao-jiao, et al. DEM numerical simulation on keying characteristics of suction embedded plate anchors[J]. China Science Paper, 2015, 10(7):828-833.
[11]刘嘉,王栋.正常固结黏土中平板锚基础的吸力和抗拉力[J].岩土力学,2009,30(3):735-740.LIU Jia, WANG Dong. Tension resistance and suction of plate anchor foundation in normally consolidated clay[J]. Rock and Soil Mechanics, 2009, 30(3):735-740.
[12]王栋,胡玉霞,宋振河.均质黏土中圆形平板锚的抗拉承载力分析[J].岩土力学,2007,28(6):1 242-1 246.WANG Dong, HU Yu-xia, SONG Zhen-he. Analysis of uplift capacity of circular plate anchors in uniform clay[J]. Rock and Soil Mechanics, 2007, 28(6):1 242-1 246.
[2]王栋.非完全粗糙平板锚旋转安装过程中的丢失埋深[J].岩土力学,2012,33(9):2 765-2 770.WANG Dong. Losses of embedment of non-rough plate anchors during keying[J]. Rock and Soil Mechanics, 2012, 33(9):2 765-2 770.
[3] DAS B M. Model tests for uplift capacity of foundation in clay[J].Soils and Foundation, 1978, 18(2):17-24.
[4] DAS B M. A procedure for estimation of ultimate capacity of foundation in clay[J]. Soils and Foundation,1980, 20(1):77-82.
[5]刘嘉,董志良,郭伟玲.非均质饱和黏土中平板锚基础的抗拉力[J].水运工程,2008(7):1-6.LIU Jia, DONG Zhi-liang, GUO Wei-ling. Uplift capacity of plate anchor foundation in saturated heterogeneous clay[J]. Port&Waterway Engineering, 2008(7):1-6.
[6]王晖,董玉才,李新超.法向承力锚极限抗拔力影响因素的二维有限元分析[J].天津大学学报,2010,43(11):964-970.WANG Hui, DONG Yu-cai, LI Xin-chao. Two-dimensional FEM analysis of influencing factors on ultimate pull-out capacity of vertically loaded anchor[J]. Journal of Tianjin University, 2010, 43(11):964-970.
[7]刘海笑,杨晓亮.法向承力锚极限抗拔力特性[J].海洋工程,2006,24(4):8-14.LIU Hai-xiao, YANG Xiao-liang. Characteristics of ultimate pullout capacity for vertically loaded anchors[J]. The Ocean Engineering, 2006, 24(4):8-14.
[8] MERIFIELD R S, LYAMIN A V, SLOAN S W. Three-dimensional lower-bound solutions for the stability of plate anchors in sand[J].Géotechnique, 2006, 56(2):123-132.
[9] O′LOUGHLIN C D, LOWMASS A, GAUDIN C, et al. Physical modelling to assess keying characteristics of plate anchors[C]//Proceedings of the 6th international conference on physical modelling in geotechnics. 2006(1):659-665.
[10]曹可达,谭慧明,王娇娇,等.吸力贯入式平板锚旋转特性的离散元数值模拟[J].中国科技,2015,10(7):828-833.CAO Ke-da, TAN Hui-ming, WANG Jiao-jiao, et al. DEM numerical simulation on keying characteristics of suction embedded plate anchors[J]. China Science Paper, 2015, 10(7):828-833.
[11]刘嘉,王栋.正常固结黏土中平板锚基础的吸力和抗拉力[J].岩土力学,2009,30(3):735-740.LIU Jia, WANG Dong. Tension resistance and suction of plate anchor foundation in normally consolidated clay[J]. Rock and Soil Mechanics, 2009, 30(3):735-740.
[12]王栋,胡玉霞,宋振河.均质黏土中圆形平板锚的抗拉承载力分析[J].岩土力学,2007,28(6):1 242-1 246.WANG Dong, HU Yu-xia, SONG Zhen-he. Analysis of uplift capacity of circular plate anchors in uniform clay[J]. Rock and Soil Mechanics, 2007, 28(6):1 242-1 246.