风化岩体中压力型锚索抗震性能的数值模拟分析

Numerical Simulation on Seismic Performance of Pressure-type Anchorage Cable in Weathered Rock

为了更加精确地研究风化岩体中压力型锚索的抗震性能,通过FLAC3D软件对风化岩体中压力型锚索的动力响应进行了数值模拟。在地震荷载作用下,数值模拟研究了风化岩体的弹性模量、泊松比、凝聚力及内摩擦角对注浆体受到的压应力和接触面上的剪应力的影响,得到了注浆体受到的压应力时程曲线和接触面上的剪应力时程曲线及其规律。结果表明:在地震荷载和预应力荷载共同作用下,风化岩体的弹性模量、凝聚力及内摩擦角的变化对注浆体受到的压应力峰值和接触面上的剪应力峰值的影响较大,而泊松比的变化对注浆体受到的压应力峰值和接触面上的剪应力峰值的影响很小。研究成果丰富了压力型锚索锚固机理内容,对压力型锚索的抗震性能分析具有参考价值,可供工程界参考。

In order to accurately study on seismic performance of pressure-type anchorage cable in weathered rock, the dynamic response of pressure-type anchorage cable in weathered rock were numerically modeled by FLAC3D. Under the earthquake load, the effect of the grout compressive stress and the contact surface shear stress of elastic modulus, poisson＇ s ratio, cohesion and angle of internal friction of weathered rock were numerically modeled, the grout compressive stress time history curves and the contact surface shear stress time history curves were obtained. The results showed that the elastie modulus, cohesion and angle of internal friction of weathered rock had a really significant effect on the grout compressive stress and the contact surface shear stress, but the poisson＇s ratio of weathered rock had a smaller influence on them. The results enriched the content of anchorage type pressure mechanism, were valuable references in seismic performanee of pressure-type anchorage cable, and provided a theoretical basis for practical engineering applications.