【摘要】 预应力锚索的锚固荷载及其变化规律是保证边坡加固效果的重要因素,在详细分析影响预应力锚索长期荷载变化因素的基础上,进一步根据大量现场长期监测资料的统计分析,提出了预应力锚索长期荷载的变化规律及预测模型。研究表明:预应力锚索的锚固荷载的变化可以分为3个主要阶段,即快速下降阶段、波动变化阶段与稳定变化阶段;控制预应力锚索锚固长期荷载的因素主要为钢铰线松弛、岩体蠕变、温度变化等。将提出的预测模型对某一实际工程中的锚索进行了预测,得出了较为一致的结果。更多还原

【Abstract】 The long-term performance of prestressed rock cables constitutes an important aspect of stability of the reinforced slopes. Based on analyzing the factors affecting the load variation in long-term,the variation law of prestress load is obtained,and prediction model is also developed. Monitoring data show that the load variations with time can be described as three phases. Phase I,lasting about 3～6 months,includes instantaneous losses of load during the lock-off operation. Phase II may take several years,in which load fluctuates. In phase III,the load is losed with uniform rate in long time. The main factors affecting the long-term performance of prestress rock cables are rock deformation,steel fiber relaxation and temperature change. The presented prediction model has been applied to practical engineering and good agreement is obtained with field monitoring data.更多还原