地铁车站二氧化碳相变致裂法施工的动力响应分析
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摘要
以乌鲁木齐地铁1号线王家梁车站小导洞CO_2相变致裂法施工为工程背景,研究CO_2致裂技术原理。计算得出压力为270 MPa的CO_2致裂器致裂产生的能量与277 g TNT所具有的能量相当。使用LS~_DYNA软件对转化为TNT当量的CO_2致裂爆破进行数值模拟,对地表BRT(快速公交)车站和浅埋排水管两处风险源进行安全分析。研究表明:各监测点振动速度达到峰值的时间与应力波传递时间一致;爆破的振动影响随着离爆源的距离逐渐增加而逐渐减小,模拟和实测振动速度均在安全范围以内。将CO_2致裂能转化为TNT当量进行模拟计算的方法合理可行。
Based on the engineering background of Wangjialiang Station on Urumqi metro line 1 that adopts the carbon dioxide(CO2)phase change fracturing method in con-struction,the principle of CO2 fracturing technology is studied.Calculation result shows that the energy produced by 270 MPa CO2 fracturing device is comparable to 277 g TNT. Then, the numerical simulation of CO2 fracture blasting that is converted into TNT equivalent is performed by LS-DYNA software,the data obtained are used for the monitoring and analysis of two risk sources:surface BRT station and shallow drainage pipe.This research shows that the time when vibration velocity of the monitoring points near BRT station reaches the peak value in agreement with that of the stress wave transmission. When the distance from the detonation source increases,the vibration effect of blasting will gradually decrease,and the simulated and actual monitored velocity data are within safety limits. It is reasonable and feasible to convert CO2 fracturing energy into TNT equivalent.
Based on the engineering background of Wangjialiang Station on Urumqi metro line 1 that adopts the carbon dioxide(CO2)phase change fracturing method in con-struction,the principle of CO2 fracturing technology is studied.Calculation result shows that the energy produced by 270 MPa CO2 fracturing device is comparable to 277 g TNT. Then, the numerical simulation of CO2 fracture blasting that is converted into TNT equivalent is performed by LS-DYNA software,the data obtained are used for the monitoring and analysis of two risk sources:surface BRT station and shallow drainage pipe.This research shows that the time when vibration velocity of the monitoring points near BRT station reaches the peak value in agreement with that of the stress wave transmission. When the distance from the detonation source increases,the vibration effect of blasting will gradually decrease,and the simulated and actual monitored velocity data are within safety limits. It is reasonable and feasible to convert CO2 fracturing energy into TNT equivalent.
引文
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[2] VIDANOVIC N,OGNJANOVIC S, ILINCICl N, et al. Appli_cation of unconventional methods of underground premises construction in coal mines[J]. Technics Technologies Educa_tion Management,2011,6(4):861.
[3]王大赛.CO2爆破在掘进工作面的应用[J].化工管理,2016(15):101.
[4]聂政.CO2炮爆破在煤矿的应用[J].煤炭技术,2007,26(8):62.
[5]霍中刚.二氧化碳致裂器深孔预裂爆破煤层增透新技术[J].煤炭科学技术,2015,43(2):80.
[6]赵龙,王兆丰,孙矩正,等.液态CO2相变致裂增透技术在高瓦斯低透煤层的应用[J].煤炭科学技术,2016,44(3):75.
[7]王兆丰,周大超,李豪君,等.液态CO2相变致裂二次增透技术[J].河南理工大学学报(自然科学版),2016,35(5):597.
[8]董庆祥,王兆丰,韩亚北,等.液态CO2相变致裂的TNT当量研究[J].中国安全科学学报,2014,24(11):84.
[9]陈喜恩,赵龙,王兆丰,等.液态CO2相变致裂机理及应用技术研究[J].煤炭工程,2016,48(9):95.
[10]杜泽生,范迎春,薛宇飞,等.CO2爆破采掘装备及技术研究[J].煤炭科学技术,2016,44(9):36.
[11]张继春,曹孝君,郑爽英,等.浅埋隧道掘进爆破的地表震动效应试验研究[J].岩石力学与工程学报,2005,24(22):4158.
[12]浣石,蒋国平.用Lagrange分析方法确定固体炸药基于JWL状态方程的反应速率方程[J].湖南大学学报(自然科学版),2006,33(3):33.
[13]白金泽.LS_DYNA3D理论基础与实例分析[M].北京:科学出版社,2005.
[14]贾虎,徐颖.岩体开挖爆炸应力损伤范围研究[J].岩石力学与工程学报,2007,26(增刊1):3489.
[15]国家安全生产监督管理总局.爆破安全规程:GB 6722—2016[S].北京:中国标准出版社,2016.
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