發(fā)布時間：2018-06-09 17:20

  本文選題：地下綜合管廊 + 電纜　； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著我國經(jīng)濟的快速發(fā)展,地下綜合管廊成為了國家“十三五”規(guī)劃的重要城市基礎(chǔ)設(shè)施之一�；馂�(zāi)是地下綜合管廊面臨的最大安全風(fēng)險之一。由于空間狹小,通風(fēng)受限,綜合管廊一旦發(fā)生火災(zāi),熱煙氣難以及時排出,管廊內(nèi)溫度急劇上升,將引燃管廊內(nèi)的電力、通訊電纜和其它管道的保溫材料,造成嚴(yán)重經(jīng)濟損失,甚至導(dǎo)致城市癱瘓。電纜起火是綜合管廊火災(zāi)的常見原因。本文通過開展YZ型橡套電纜燃燒特性試驗,分析了電纜護套材料的燃燒熱值及外部輻射熱流下熱解特征。實驗測得YZ電纜橡膠護套材料燃燒熱值為11 308.5 kJ/kg,緊密排布和間歇排情況下,其臨界輻射熱流分別為24.75 kW/m2、27.40 kW/m2。搭建1:3.6縮尺寸綜合管廊模型,開展火災(zāi)模型實驗。發(fā)現(xiàn)地下綜合管廊電纜火災(zāi)在200 s-600 s期間燃燒較為劇烈,該階段僅占燃燒時間的23%,卻貢獻了75%的質(zhì)量損失。根據(jù)質(zhì)量損失速率計算得縮尺寸模型實驗中1#、2#、3#火源燃燒旺盛階段對應(yīng)的平均熱釋放速率分別為34.19 kW、24.06 kW、17.19 kW。根據(jù)相似原理計算得到全尺寸火災(zāi)中1#、2#、3#火源平均熱釋放速率分別為533.02kW、375.09 kW、279.06 kW。模型實驗結(jié)果表明:管廊頂棚下方最高溫升僅與火源距頂棚的距離和無量綱釋熱速率有關(guān);頂棚溫度沿縱向呈指數(shù)規(guī)律衰減。對實驗數(shù)據(jù)進行整合分析,給出了管廊頂棚下方最高溫升模型和頂棚縱向溫度分布模型。對縮尺寸模型開展火災(zāi)數(shù)值模擬研究,模擬結(jié)果表明其頂棚最高溫升、縱向溫度分布規(guī)律與實驗數(shù)據(jù)基本吻合,從而驗證了FDS火災(zāi)模擬軟件在研究地下綜合管廊火災(zāi)方面的可行性。針對沈陽某地下綜合管廊建立全尺寸數(shù)值模擬模型,采用FDS研究不同縱向風(fēng)速對溫度場分布及煙氣流動特性規(guī)律的影響。研究發(fā)現(xiàn)縱向溫度在煙氣逆流前鋒處有突然躍升現(xiàn)象,下風(fēng)側(cè)頂棚溫度場縱向衰減有類似指數(shù)規(guī)律。觀察數(shù)值模擬現(xiàn)象并結(jié)合理論分析,得到無量綱煙氣逆流長度與無量綱火源功率以及無量綱風(fēng)速之間關(guān)系。對模擬數(shù)據(jù)進行處理提出了地下綜合管廊火災(zāi)煙氣逆流長度預(yù)測模型。根據(jù)前人研究理論結(jié)合經(jīng)驗公式計算值,得到無量綱縱向臨界風(fēng)速與無量綱火源功率之間關(guān)系。經(jīng)過無量綱分析,提出了無量綱臨界風(fēng)速預(yù)測模型。
[Abstract]:With the rapid economic development of our country, the underground comprehensive pipe corridor has become one of the important urban infrastructure in the 13th Five-Year Plan. Fire is one of the biggest safety risks faced by underground plumbing. Because of the narrow space and limited ventilation, once the fire occurs in the integrated pipe gallery, the hot smoke is difficult to be discharged in time, and the temperature in the pipe gallery rises sharply. The heat preservation material of the electric power, communication cable and other pipes in the pipe gallery will be ignited, resulting in serious economic losses. It even paralyzes the city. The fire of cable is the common cause of fire in integrated pipe gallery. In this paper, the combustion calorific value of the cable sheath material and the pyrolysis characteristics under the external radiant heat flow are analyzed through the test of the combustion characteristics of the YZ type rubber sheathed cable. The experimental results show that the combustion calorific value of YZ cable rubber sheathing material is 11 308.5 KJ / kg, and the critical radiation heat flux is 24.75 kW / m227.40 kW / m2 under the condition of tight arrangement and intermittent discharge, respectively. The model of 1: 3.6 condensed pipe gallery was built and the fire model experiment was carried out. It is found that the underground integrated pipe gallery cable fire burns intensely during the period of 200s-600 s, which only accounts for 23% of the burning time, but contributes 75% of the mass loss. According to the mass loss rate, the average heat release rate corresponding to the burning exuberant stage of 1 #Li 2 #4 is 34.19 kW / t 24.06 kW / m 17.19 kW, respectively. According to the principle of similarity, the average heat release rate of 1 #an 2 #HG fire source in a full-scale fire was calculated to be 533.02 kW ~ 375.09 kW ~ (-1) 279.06 kW, respectively. The results of model experiments show that the maximum temperature rise under the roof of the pipe gallery is only related to the distance from the fire source to the roof and the dimensionless heat release rate, and the temperature of the roof decreases exponentially along the longitudinal direction. Based on the analysis of the experimental data, the maximum temperature rise model and the vertical temperature distribution model are given. The fire numerical simulation of the shrinking size model is carried out. The simulation results show that the maximum temperature rise of the ceiling and the longitudinal temperature distribution are in good agreement with the experimental data. Thus, the feasibility of FDS fire simulation software in the study of underground integrated pipe gallery fire is verified. A full-scale numerical simulation model was established for an underground integrated pipe gallery in Shenyang. FDS was used to study the influence of different longitudinal wind speeds on temperature field distribution and flue gas flow characteristics. It is found that the vertical temperature jumps suddenly at the front of the flue gas countercurrent, and the vertical attenuation of the temperature field in the downwind side has a similar exponential law. By observing the numerical simulation phenomenon and combining with the theoretical analysis, the relationship between the countercurrent length of the dimensionless flue gas and the dimensionless fire source power and the dimensionless wind speed is obtained. A prediction model of smoke countercurrent length in underground integrated pipe gallery fire is proposed for the simulation data processing. The relationship between dimensionless longitudinal critical wind speed and dimensionless fire source power is obtained according to previous research theory and empirical formula. After dimensionless analysis, a dimensionless critical wind speed prediction model is proposed.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU990.3;TU998.1

【參考文獻】

相關(guān)期刊論文 前10條

1 于浩;;城市綜合管廊工程通風(fēng)系統(tǒng)設(shè)計淺析[J];科技創(chuàng)新導(dǎo)報;2016年36期

2 婁佳濯;吳小冬;;市政綜合管廊通風(fēng)系統(tǒng)的設(shè)計原則與要點[J];江西建材;2017年03期

3 王洪宇;王皓;郜品一;;淺談綜合管廊在地震荷載作用下研究現(xiàn)狀[J];中國新技術(shù)新產(chǎn)品;2016年24期

4 竇榮舟;劉明超;王彥祥;;談地下城市綜合管廊的通風(fēng)設(shè)計[J];山西建筑;2016年15期

5 姚偉建;杜森;;城市綜合管廊應(yīng)用研究[J];建筑知識;2016年05期

6 陳武生;;地下城市綜合管廊抗火構(gòu)造與消防設(shè)計研究[J];江西建材;2016年08期

7 陳國興;陳蘇;杜修力;路德春;戚承志;;城市地下結(jié)構(gòu)抗震研究進展[J];防災(zāi)減災(zāi)工程學(xué)報;2016年01期

8 劉清泉;;沈陽南運河綜合管廊消防方式選擇淺析[J];黑龍江科技信息;2015年36期

9 于晨龍;張作慧;;國內(nèi)外城市地下綜合管廊的發(fā)展歷程及現(xiàn)狀[J];建設(shè)科技;2015年17期

10 程潔群;;綜合管廊消防設(shè)計探討[J];武警學(xué)院學(xué)報;2014年08期

相關(guān)博士學(xué)位論文 前2條

1 李立明;隧道火災(zāi)煙氣的溫度特征與縱向通風(fēng)控制研究[D];中國科學(xué)技術(shù)大學(xué);2012年

2 王蔚;聚氯乙烯電纜火災(zāi)特性及其影響因素研究[D];中國科學(xué)技術(shù)大學(xué);2008年

相關(guān)碩士學(xué)位論文 前5條

1 谷思念;地鐵隧道火災(zāi)溫度場分布及基于熱力耦合的結(jié)構(gòu)損傷研究[D];中國礦業(yè)大學(xué);2016年

2 張思健;典型通風(fēng)條件下隧道火災(zāi)煙氣流動及溫度特性研究[D];北京建筑大學(xué);2016年

3 吳天琦;基于實驗與區(qū)域模型的受限空間多層電纜橋架火災(zāi)研究[D];中國科學(xué)技術(shù)大學(xué);2016年

4 王君;阻塞效應(yīng)對有、無坡隧道火災(zāi)臨界風(fēng)速及溫度特性的影響研究[D];西安建筑科技大學(xué);2015年

5 韓如適;兩面臨空薄型可燃物豎向燃燒特性實驗與理論研究[D];中國礦業(yè)大學(xué);2014年

，

本文編號：2000521