CAJ | 학술논문

为了提高预应力锚杆预应力的随机、无损动力检测精度，首先根据预应力锚杆对围岩的加载力学特点，提出了预应力锚杆的预应力无损动力检测力学模型；然后基于弹性动力学和结构动力学对预应力锚杆外端受激振动力学模型进行理论分析，得到了预应力锚杆的预应力计算式；最后以混凝土试块模拟围岩，并在混凝土试块预留孔中锚固了树脂锚杆，采用动力测试仪对无预应力和有预应力锚杆进行无损动力测试。结果表明，悬臂梁式动力学模型符合预应力锚杆外端受激振动力学特点，测试误差基本满足现场要求。
위료제고예응력묘간예응력적수궤、무손동력검측정도，수선근거예응력묘간대위암적가재역학특점，제출료예응력묘간적예응력무손동력검측역학모형；연후기우탄성동역학화결구동역학대예응력묘간외단수격진동역학모형진행이론분석，득도료예응력묘간적예응력계산식；최후이혼응토시괴모의위암，병재혼응토시괴예류공중묘고료수지묘간，채용동력측시의대무예응력화유예응력묘간진행무손동력측시。결과표명，현비량식동역학모형부합예응력묘간외단수격진동역학특점，측시오차기본만족현장요구。
In order to improve the random and non-destructive dynamic detection accuracy of pre-stress of rock-bolt, according to pre-stressed rock-bolt mechanical characteristics loaded on the sur-rounding rock, the mechanical model of non-destructive dynamic detection of pre-stress of rock-bolt has been firstly put forward. Secondly, based on elastic dynamics and structural dynamics, the theoretical analysis of vibration mechanical model of pre-stressed rock-bolt has been presented when it is stimu-lated at its outer end, and the pre-stress formula of pre-stressed rock-bolt has been obtained. Finally, with the simulation of surrounding rock with concrete block, and anchored resin rock-bolt in the re-served hole of concrete block, the non-prestressed and prestressed rock-bolt have been detected by non-destructive dynamic detection instrument. The result has shown that the cantilever dynamics model is consistent with vibration mechanics characteristics of pre-stressed rock-bolt when stimulated at its outer end, and that test error basically meets the requirement of the field.