地震作用下预应力锚索加固危岩体的动力响应分析  

Analysis of dynamic response of dangerous rock mass reinforced by prestressed anchor cables under seismic loads

作　　者：石玉成[1] 秋仁东[2,3] 孙军杰[1] 胡明清[1] 

机构地区：[1]中国地震局兰州地震研究所,兰州730000 [2]中国建筑科学研究院地基基础研究所,北京100013 [3]建研地基基础工程有限责任公司,北京100013

出　　处：《岩土力学》2011年第4期1157-1162,共6页Rock and Soil Mechanics

基　　金：国家社会公益研究专项(No.2002DIB20062);甘肃省科技支撑计划(No.0708NKCF089)

摘　　要：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 dangerous rock mass reinforced by prestressed anchor cables, displacement field and stress field distributions are simulated under different seismic loads; and based on three typical sections of a reinforced dangerous rock mass project, dynamic response and variations are revealed. The analysis results show that the displacements and stresses of the reinforced dangerous rock mass increase obviously with the increase of seismic dynamic peak acceleration （PGA） and characteristic period of response spectrum （Tg）. Range of stress concentration expands; probability of surrounding rock damage increases and stability decreases. The results can provide theoretical basis and practical reference for aseismic reinforcement and disaster mitigation of dangerous rock mass.

关 键 词：危岩 预应力锚索 地震荷载 动力有限元法 

分 类 号：TU435[建筑科学—岩土工程]