爆破动载对不同龄期混凝土支护体影响的数值模拟
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摘要
为研究爆破振动荷载对混凝土喷层的影响,以邹庄煤矿南翼胶带上仓斜巷开挖工程为背景,采用动力有限元软件分析了巷道掘进爆破振动载荷作用下喷射混凝土的峰值振速及应力变化特征,结合PPV安全判据比较了不同龄期混凝土的损伤情况。研究结果表明:相同龄期下爆心距越小,其损伤越严重,混凝土喷层严重损伤区域在0~2.5 m;随着混凝土龄期的增加,水泥水化反应的完成,轻度损伤范围逐渐加大,龄期1 d混凝土喷层轻度损伤区范围为2.5~15 m、3 d为2.5~16.25 m、7 d为2.5~16.875 m。
In order to explore the influence of blasting vibration on shotcrete with different ages, taking the inclined roadway excavation engineering of Zouzhuang Mine south wing, the dynamic finite element software is used to analyze the peak vibration velocity and stress variation characteristics of shotcrete under the loading action of roadway tunneling blasting vibration. According to the PPV safety criterion, the damage of concrete with different ages is compared. The results showed that: at same age, the smaller the blast center distance is, the more serious blasting damage the shotcrete is, and the severe damage area of concrete spraying layer is 0 to 2.5 m; with the increase of the age of the concrete and the completion of cement hydration reaction, the mild damage range increases gradually, the mild damage range of concrete spray layer with the age of 1 d is 2.5 m to 15 m, 3 d is 2.5 m to 16.25 m, 7 d is 2.5 m to 16.875 m.
In order to explore the influence of blasting vibration on shotcrete with different ages, taking the inclined roadway excavation engineering of Zouzhuang Mine south wing, the dynamic finite element software is used to analyze the peak vibration velocity and stress variation characteristics of shotcrete under the loading action of roadway tunneling blasting vibration. According to the PPV safety criterion, the damage of concrete with different ages is compared. The results showed that: at same age, the smaller the blast center distance is, the more serious blasting damage the shotcrete is, and the severe damage area of concrete spraying layer is 0 to 2.5 m; with the increase of the age of the concrete and the completion of cement hydration reaction, the mild damage range increases gradually, the mild damage range of concrete spray layer with the age of 1 d is 2.5 m to 15 m, 3 d is 2.5 m to 16.25 m, 7 d is 2.5 m to 16.875 m.
引文
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[2]李夕兵,凌同华,张义平.爆破振动信号分析理论与技术[M].北京:科学出版社,2009.
[3]姚强,杨兴国,陈兴泽,等.大型地下厂房开挖爆破振动动力响应数值模拟[J].振动与冲击,2014,33(6):66-70.
[4]赵振国,杨建华,卢文波,等.基于爆破振动影响评价的深埋隧洞围岩二次喷护时期选择[J].振动与冲击,2015,34(7):8-14.
[5]戴思南,吴新霞,李广平.结构尺寸与龄期对混凝土爆破振动响应的影响[J].爆破,2015,32(1):131-134.
[6]郝海明,赵光明,孟祥瑞.爆破对不同龄期混凝土喷层破坏的数值分析[J].地下空间与工程学报,2013,9(1):173-178.
[7]赵建平,宋晓东.城市地铁爆破开挖对浅埋地下大直径管道的安全影响研究[J].震灾防御技术,2015,10(3):531-538.
[8]管晓明,傅洪贤,王梦恕.隧道近距下穿山坡楼房爆破振动测试研究[J].岩土力学,2014,35(7):1995.
[9]汪海波,宗琦.煤矿超深孔大药量爆破震动安全性研究[J].安全与环境学报,2015,15(5):60-63.
[10]石少卿,康建功,王敏,等.ANSYS/LS-DYNA在爆炸与冲击领域内的工程应用[M].北京:中国建筑工业出版社,2011:23-28.
[11]巫绪涛,李耀,李和平.混凝土HJC本构模型参数的研究[J].应用力学学报,2010,27(2):340-344.