發(fā)布時(shí)間：2019-07-01 13:20

【摘要】：為識(shí)別和圈定開挖擾動(dòng)過程地下廠房圍巖損傷區(qū)域,分析評(píng)價(jià)圍巖穩(wěn)定性,構(gòu)建了ESG微震監(jiān)測系統(tǒng),對圍巖內(nèi)部微破裂活動(dòng)開展實(shí)時(shí)監(jiān)測。監(jiān)測結(jié)果表明:監(jiān)測期間出現(xiàn)了2個(gè)微震事件聚集區(qū)域,均與母線洞爆破開挖擾動(dòng)及母線洞與主變室邊墻的交叉臨空面形成有關(guān)。地下廠房微震活動(dòng)存在明顯的隨施工擾動(dòng)控制的時(shí)空遷移演化規(guī)律,分析其規(guī)律特征可為支護(hù)施工提供針對性參考。E_S/E_P為微震事件S波和P波能量比值,聚集區(qū)域Ⅰ約75%的微震事件E_S/E_P值小于10,表明微破裂以拉伸型破壞為主。同時(shí),該區(qū)域圍巖變形松弛前,微震事件具有"短期聚集、視應(yīng)力迅速增加、視體積緩慢增長"的特點(diǎn),可作為圍巖變形預(yù)警的定性判別指標(biāo)。研究成果可為兩河口水電站地下廠房后期施工支護(hù)提供參考。
[Abstract]:In order to identify and circle the damage area of surrounding rock of underground powerhouse during excavation disturbance, and to analyze and evaluate the stability of surrounding rock, a ESG microseismic monitoring system is constructed to monitor the micro-fracture activity in surrounding rock in real time. The monitoring results show that there are two microseismic event accumulation areas during the monitoring period, which are related to the blasting excavation disturbance of the bus hole and the formation of the intersecting surface between the bus hole and the side wall of the main transformer chamber. The microseismic activity of underground powerhouse has obvious temporal and spatial migration and evolution law controlled by construction disturbance, and the analysis of its characteristics can provide targeted reference for supporting construction. E _ S/E_P is the energy ratio of S wave and P wave of microseismic event, and the E 鈮，

本文編號(hào)：2508512