本文選題：地下洞室群 + 調(diào)壓室��； 參考：《工程科學(xué)與技術(shù)》2017年03期

【摘要】：大型地下洞室群施工期通風(fēng)散煙效果直接影響施工效率和施工人員安全,結(jié)合黃金坪水電站地下廠房調(diào)壓室工程,借助數(shù)值模擬和現(xiàn)場(chǎng)檢測(cè)方法動(dòng)態(tài)調(diào)整通風(fēng)方案。采用FLUENT軟件模擬洞室內(nèi)通風(fēng)流場(chǎng),結(jié)果表明在初始通風(fēng)方案下調(diào)壓室風(fēng)速總體滿(mǎn)足規(guī)范要求,但在洞室交叉等邊角處風(fēng)速小于0.25 m/s,建議在洞室交叉處增設(shè)負(fù)壓風(fēng)機(jī)和射流風(fēng)機(jī),并封閉已完工且無(wú)后續(xù)通風(fēng)需求的上層施工支洞,從實(shí)測(cè)結(jié)果來(lái)看,以上措施取得了良好的效果,洞室邊角處的風(fēng)流速度明顯加快,均達(dá)到了規(guī)范要求。對(duì)地下洞室群通風(fēng)質(zhì)量進(jìn)行現(xiàn)場(chǎng)跟蹤檢測(cè),結(jié)果表明:初始通風(fēng)方案經(jīng)過(guò)優(yōu)化后,洞室群風(fēng)速總體有一定的增加;分析風(fēng)速、風(fēng)溫、粉塵濃度3要素的相關(guān)性發(fā)現(xiàn)風(fēng)速與粉塵濃度和風(fēng)溫呈明顯的負(fù)相關(guān);從風(fēng)流要素沿程變化趨勢(shì)來(lái)看,當(dāng)洞室群內(nèi)整體或局部區(qū)段風(fēng)速低于0.5 m/s時(shí),洞內(nèi)溫度基本都高于規(guī)范規(guī)定的28℃,粉塵濃度均大幅超過(guò)國(guó)家安全標(biāo)準(zhǔn)10 mg/m~3,故針對(duì)工程實(shí)際情況,為有效保證通風(fēng)質(zhì)量,建議工程中地下洞室群在開(kāi)挖時(shí)洞內(nèi)風(fēng)速應(yīng)不低于0.5 m/s。從實(shí)測(cè)數(shù)據(jù)可以發(fā)現(xiàn),現(xiàn)場(chǎng)通風(fēng)環(huán)境復(fù)雜,各洞室交叉處通風(fēng)流場(chǎng)很不穩(wěn)定,因此建議同類(lèi)工程在有條件的情況下,在施工現(xiàn)場(chǎng)增設(shè)風(fēng)流要素實(shí)時(shí)檢測(cè)點(diǎn),根據(jù)現(xiàn)場(chǎng)檢測(cè)結(jié)果對(duì)通風(fēng)方案進(jìn)行動(dòng)態(tài)優(yōu)化,以全方位保證通風(fēng)質(zhì)量。
[Abstract]:The ventilation effect of large underground caverns during construction period has a direct impact on the construction efficiency and safety of construction personnel. Combined with the surge chamber project of underground powerhouse of Jinping Hydropower Station, the ventilation scheme is dynamically adjusted by means of numerical simulation and field detection method. The FLUENT software is used to simulate the ventilation flow field in the cavern. The results show that the initial ventilation scheme can meet the requirements of the specifications, but the wind speed is less than 0.25 m / s at the intersection of the cavern. It is suggested that the negative pressure fan and the jet fan should be added at the intersection of the cavern. The upper construction branch tunnel which has been completed and has no subsequent ventilation requirement has been closed. The measured results show that the above measures have achieved good results and the wind flow velocity at the edge corner of the tunnel has obviously accelerated and all of them have met the requirements of the specifications. The results show that after the initial ventilation scheme is optimized, the overall wind speed of the underground cavern group increases, the wind speed and temperature of the initial ventilation group are analyzed, and the ventilation quality of the underground cavern group is tested on the spot, and the results show that the initial ventilation scheme is optimized. The correlation of three elements of dust concentration showed that the wind speed was negatively correlated with the dust concentration and the wind temperature, and from the trend of the wind flow elements along the course, when the wind speed in the whole or local section of the cavern group was less than 0.5 m / s, The temperature in the tunnel is basically higher than the 28 鈩，

本文編號(hào)：1836813