松动圈分区模型及其在地下工程反馈分析中的应用

LOOSENING ZONAL MODEL AND ITS APPLICATION TO BACK ANALYSIS OF UNDERGROUND ENGINEERING

在地下洞室的开挖过程中,由于爆破以及其他施工操作的影响,将会在洞室周围的岩体中产生出一个松动圈。介绍几种松动圈模型及其在数值分析中对松动圈的处理方法;结合洞室开挖后围岩松动圈形成及分布的差异性,提出一种更适合于大型地下厂房复杂洞室群位移反馈分析的分区分级频率-位移相关松动圈模型,并介绍其在锦屏一级水电站地下厂房洞室群施工期反馈分析中的应用,借此验证考虑松动圈的反馈分析方法的合理性及提出的松动圈反馈模型的地下工程适用性。

Due to blasting and other disturbances during the process of excavation of underground caverns, loosening zone around the caverns can be found, and it would become larger with time at high geostress. Several loosening zone models and its simulation method proposed are introduced by other scholars. Based on the models, a new model is proposed that is related to fi＇equency and displacement, which can be used to large and complex underground caverns. Due to different forms and distribution loosing zones around the underground caverns, its application to displacement back analysis for Jinping I hydropower underground caverns is introduced. Therefore, it should consider loosening zone in back analysis, and the proposed loosening model is suitable for underground engineering.