风化岩地基中玻璃纤维增强聚合物抗浮锚杆体系受力特性数值模拟

来源期刊:中南大学学报(自然科学版)2019年第6期

论文作者:张明义 白晓宇 匡政 闫楠 贾科科

文章页码:1466 - 1474

关键词:抗浮锚杆体系;内锚固;外锚固;应力;有限元方法;GFRP

Key words:anti-floating anchor system; internal anchorage; external anchorage; stress; finite element method(FEM); glass fiber reinforcement polymer

摘    要:基于ABAQUS非线性有限元软件,在考虑多界面接触的情况下建立基础底板-GFRP抗浮锚杆体系的一体化轴对称计算模型,分析浮力作用下GFRP抗浮锚杆体系的变形性能和受力特征。研究结果表明:抗浮体系的竖向位移和锚筋的应力分布规律与试验结果较吻合,抗浮体系的竖向位移以内锚固变形为主。不考虑基础底板与地层的黏结作用时,GFRP抗浮锚杆体系中内、外锚固段锚筋的轴应力和剪应力的分布规律与各自独立的分布规律一致。锚筋在基础底板与地层界面出现轴应力峰值,随地下水浮力的增加,轴应力分布范围逐渐增大,轴应力峰值也相应增大,轴应力在基础底板中的衰减速率要比在地层中的快。锚筋的剪应力在抗浮体系中出现2个峰值点,且锚筋在基础底板中的剪应力峰值为地层中剪应力峰值的4.2~5.0倍;随着地下水浮力的增大,锚筋剪应力的分布范围逐渐变大,内、外锚固段剪应力峰值也相应增大。

Abstract: Considering the condition of the multi-interface contact, an axisymmetric model simulating foundation slab-GFRP(glass fiber reinforcement polymer) anti-floating anchor system was established based on the ABAQUS nonlinear finite element software, and the characteristics of deformation and bearing behavior of GFRP anti-floating anchor were analyzed. The results show that the laws of the vertical displacement, and strains distribution of the anti-floating system are similar to the test results, and the vertical displacement is mainly provided by part of internal anchorage. When neglecting the cohesion between the foundation slab and stratum, the distribution laws of the axial force and shear resistance in internal and external anchorage section are the same as the condition when the two anchorage sections bear the load alone. The maximum axial force of the anchor appears at foundation slab-stratum interface, and the distribution range and the maximum value of the force gradually increase as the buoyancy force gets large. The attenuation of the axial force in foundation slab is faster than that in stratum. Besides, there are two maximum points of anchor’s shear resistance in the internal and external anchorage section, respectively, and the maximum value in the external anchorage section is 4.2-5.0 times of that in internal anchorage section. With the increase of the buoyancy force, the distribution range and the maximum value of the shear resistance in the internal and external anchorage section are also magnified subsequently.

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