【摘要】：烏東德水電站右岸地下廠房洞室群布置復(fù)雜,中低應(yīng)力條件下,"陡傾、小夾角"等不利巖層產(chǎn)狀導(dǎo)致結(jié)構(gòu)面控制型破壞現(xiàn)象突出。結(jié)合地質(zhì)、現(xiàn)場勘查、常規(guī)監(jiān)測、微震監(jiān)測及數(shù)值模擬資料,全面總結(jié)和分析右岸廠房下游拱座巖體破壞模式及形成機(jī)制。首先,基于現(xiàn)場勘查及常規(guī)監(jiān)測資料,歸納和總結(jié)圍巖破壞的基本特征與規(guī)律,包括其破壞形式、空間位置、破壞規(guī)模、破壞發(fā)展特征等主要信息;其次,總結(jié)巖體破壞孕育、發(fā)展過程中微震活動強(qiáng)度的時間演化規(guī)律,分析得到基于微震活動特征的層狀巖體破壞前兆;最后,采用"微震監(jiān)測"為主"數(shù)值模擬"為輔的綜合分析手段,揭示下游拱座巖體發(fā)生彎曲傾倒的破壞本質(zhì)及其形成機(jī)制,探討巖體結(jié)構(gòu)對拱座圍巖破壞的力學(xué)影響機(jī)制。該研究可為陡傾層狀巖體中大型地下洞室優(yōu)化開挖方案和支護(hù)措施提供依據(jù),也可為同類大型地下洞室相似圍巖破壞的防控提供參考。
[Abstract]:The cavern group of underground powerhouse on the right bank of Wudongde Hydropower Station is complicated. Under the condition of middle and low stress, the occurrence of "steep dip, small angle" and other unfavorable rock strata leads to the phenomenon of structural plane controlled failure. Combined with geology, field survey, routine monitoring, microseismic monitoring and numerical simulation data, the failure mode and formation mechanism of rock mass in the downstream arch block of right bank factory building are summarized and analyzed in an all-round way. Firstly, based on the field survey and routine monitoring data, the basic characteristics and rules of surrounding rock failure are summarized, including the main information of failure form, space location, damage scale, damage development characteristics, etc. Secondly, the gestation of rock mass failure is summarized. The time evolution law of microseismic activity intensity during the development process is analyzed and the layered rock mass failure precursor based on the microseismic activity characteristics is obtained. Finally, a comprehensive analysis method of "microseismic monitoring" and "numerical simulation" is adopted. This study can provide a basis for the optimization of excavation scheme and supporting measures for large underground caverns in steeply inclined layered rock mass, and can also provide a reference for the prevention and control of similar surrounding rock failure of similar large underground caverns.
【作者單位】： 四川大學(xué)建筑與環(huán)境學(xué)院;四川大學(xué)水力學(xué)與山區(qū)河流開發(fā)保護(hù)國家重點(diǎn)實驗室;成都理工大學(xué)地質(zhì)災(zāi)害防治與地質(zhì)環(huán)境保護(hù)國家重點(diǎn)實驗室;中國長江三峽集團(tuán)公司;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計劃(973)項目(2015CB057903) 國家自然科學(xué)基金面上項目(51374149) 成都理工大學(xué)地質(zhì)災(zāi)害防治與地質(zhì)環(huán)境保護(hù)國家重點(diǎn)實驗室開放基金(SKLGP2016K018)~~
【分類號】：TV221.2

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