论文部分内容阅读
基于块体理论,针对地下厂房围岩中的关键块体,采用Newmark法进行了地震响应特征和稳定性评价方法的研究,研究表明,三向地震荷载组合作用下,在块体上引起的数值较大、作用时间很短的惯性力是关键块体产生永久位移的根本原因。块体在不同烈度地震荷载作用下其响应特征不只发生量的变化,还有运动规律、模式方面的变化。研究还发现,关键块体地震响应特征与其几何特征存在一定的相关性,并由此建立了大型地下洞室群围岩地震稳定分析的多因素、多指标评判方法。最后考虑结构面的退化效应,研究了块体地震响应特征关于结构面强度参数的敏感性,获得了一些有益的结论。
Based on the block theory, aiming at the key blocks in the surrounding rock of the underground powerhouse, the Newmark method was used to study the seismic response characteristics and stability evaluation methods. The results show that the numerical value caused by the combination of three-direction earthquake load on the block Larger, short-acting inertial forces are the root causes of the permanent displacement of the key blocks. Under different earthquake loads, the response characteristics of the blocks not only change, but also change the movement rules and modes. The study also found that there is a certain correlation between the seismic response characteristics of key blocks and their geometric characteristics, and thus established a multi-factor and multi-index evaluation method for seismic stability analysis of surrounding rock masses in large-scale underground caverns. Finally, considering the degenerative effect of the structural plane, the sensitivity of the seismic response characteristics of the block to the strength parameters of the structural plane is studied, and some useful conclusions are obtained.