利用SIMULINK仿真工具对水平双向地震输入下偏心结构的楼板谱进行了计算,研究了影响楼板谱变化的几个重要参数,最后对现行抗震设计规范中楼板谱计算的SRSS(Square Root of the Sumof Squares)方法进行了分析,并指出了它的不足。研究结...利用SIMULINK仿真工具对水平双向地震输入下偏心结构的楼板谱进行了计算,研究了影响楼板谱变化的几个重要参数,最后对现行抗震设计规范中楼板谱计算的SRSS(Square Root of the Sumof Squares)方法进行了分析,并指出了它的不足。研究结果表明:改变附属结构质量楼板谱峰值区域会有显著的变化,调谐频率处楼板谱变化最明显,地震动卓越频率处楼板谱变化相对较小;改变偏心结构和附属结构阻尼比都会引起楼板谱的变化,但是二者影响的效果不同;附属结构所在楼层和层内位置的改变,使楼板谱发生变化;偏心结构偏心距对楼板谱有较复杂的影响;规范楼板谱在非峰值区域比较精确,在峰值区域存在较大误差,当偏心结构在地震作用下不同方向耦合效应明显时,规范楼板谱在非峰值区域也存在一定的误差。关键词:偏心结构;楼板谱;时程分析;多维地震;展开更多
Eccentric decoupling blasting is commonly used in underground excavation.Determination of perimeter hole parameters(such as the blasthole diameter,spacing,and burden)based on an eccentric charge structure is vital for...Eccentric decoupling blasting is commonly used in underground excavation.Determination of perimeter hole parameters(such as the blasthole diameter,spacing,and burden)based on an eccentric charge structure is vital for achieving an excellent smooth blasting effect.In this paper,the Riedel-Hiermaier-Thoma(RHT)model was employed to study rock mass damage under smooth blasting.Firstly,the parameters of the RHT model were calibrated by using the existing SHPB experiment,which were then verified by the existing blasting experiment results.Secondly,the influence of different charge structures on the blasting effect was investigated using the RHT model.The simulation results indicated that eccentric charge blasting has an obvious pressure eccentricity effect.Finally,to improve the blasting effect,the smooth blasting parameters were optimized based on an eccentric charge structure.The overbreak and underbreak phenomena were effectively controlled,and a good blasting effect was achieved with the optimized blasting parameters.展开更多
文摘利用SIMULINK仿真工具对水平双向地震输入下偏心结构的楼板谱进行了计算,研究了影响楼板谱变化的几个重要参数,最后对现行抗震设计规范中楼板谱计算的SRSS(Square Root of the Sumof Squares)方法进行了分析,并指出了它的不足。研究结果表明:改变附属结构质量楼板谱峰值区域会有显著的变化,调谐频率处楼板谱变化最明显,地震动卓越频率处楼板谱变化相对较小;改变偏心结构和附属结构阻尼比都会引起楼板谱的变化,但是二者影响的效果不同;附属结构所在楼层和层内位置的改变,使楼板谱发生变化;偏心结构偏心距对楼板谱有较复杂的影响;规范楼板谱在非峰值区域比较精确,在峰值区域存在较大误差,当偏心结构在地震作用下不同方向耦合效应明显时,规范楼板谱在非峰值区域也存在一定的误差。关键词:偏心结构;楼板谱;时程分析;多维地震;
基金Projects(11802058,52074262)supported by the National Natural Science Foundation of ChinaProjects(BK20170670,BK20180651)supported by the Jiangsu Youth Foundation,China+2 种基金Project(2020QN06)supported by the Fundamental Research Funds for the Central Universities,ChinaProject(SKLGDUEK1803)supported by the State Key Laboratory for Geomechanics and Deep Underground Engineering,ChinaProject supported by the Mass Entrepreneurship and Innovation Project of Jiangsu,China。
文摘Eccentric decoupling blasting is commonly used in underground excavation.Determination of perimeter hole parameters(such as the blasthole diameter,spacing,and burden)based on an eccentric charge structure is vital for achieving an excellent smooth blasting effect.In this paper,the Riedel-Hiermaier-Thoma(RHT)model was employed to study rock mass damage under smooth blasting.Firstly,the parameters of the RHT model were calibrated by using the existing SHPB experiment,which were then verified by the existing blasting experiment results.Secondly,the influence of different charge structures on the blasting effect was investigated using the RHT model.The simulation results indicated that eccentric charge blasting has an obvious pressure eccentricity effect.Finally,to improve the blasting effect,the smooth blasting parameters were optimized based on an eccentric charge structure.The overbreak and underbreak phenomena were effectively controlled,and a good blasting effect was achieved with the optimized blasting parameters.
