基于岩体围压和弹模变化的GFRP土钉加固效果数值模拟分析

Numerical simulation analysis of GFRP soil nail reinforcement effect based on the change of rock pressure and elastic modulus

通过有限元数值模拟分析,研究了GFRP土钉加固岩土体在不同的弹性模量和围压条件下界面应力的分布规律.研究结果表明,随着岩体围压的增高,剪应力分布越集中于土钉的前端,但是这种影响不是很明显;随着岩体弹性模量的增大,接触界面的剪应力分布越不均匀,应力向锚固前端的集中程度越高,且应力的最大值越大,所以GFRP土钉更适合于加固软岩.

The stress distribution law of GFRP soil nail in rock mass,under different rock pressure and elastic modulus was studied by the finite element numerical simulation.The results show that the higher of the rock pressure,the more centralized of the shear stress in the head of soil nail,but the effect is not significantly.When the elastic modulus become higher,the shear stress in contact interface become more uneven,centralized in front of anchorage,therefore the GFRP soil nail is more suitable for reinforcement of soft rock.