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针对预应力锚索加固危岩体的特点,以某危岩体加固工程的3个典型工程剖面为实例,通过对不同动荷载作用下预应力锚索加固的危岩位移场、应力场分布特征的数值模拟计算,揭示了预应力锚索加固危岩体在地震作用下的动态响应和变化规律。分析结果表明,随着地震动峰值加速度(PGA)、反应谱特征周期(Tg)的增大,被加固危岩体的位移和应力值明显增大,应力集中区的范围扩大,围岩损伤的可能性增加,稳定性降低。其成果为危岩体抗震加固与减灾提供理论基础和实践依据。
Aiming at the characteristics of prestressed anchorage cable strengthening of dangerous rock mass, taking three typical engineering sections of some dangerous rock mass reinforcement project as an example, by analyzing the displacement field of dangerous rock and the distribution of stress field under different dynamic loads, The numerical simulation calculation is carried out to reveal the dynamic response and variation law of the dangerous rock mass reinforced by prestressed anchor cables under earthquake action. The results show that with the increase of the peak acceleration (PGA) and the characteristic period (Tg) of the seismic response, the displacement and stress of the reinforced rock mass increase obviously, the range of the stress concentration area expands, the damage of the surrounding rock Increased likelihood, decreased stability. The results provide the theoretical basis and practical basis for the seismic strengthening and disaster reduction of dangerous rock mass.