上穿输水隧洞公路隧道爆破开挖安全控制研究

发布时间：2018-04-24 08:47

本文选题：爆破开挖 + 输水隧洞　；参考：《爆破》2017年04期

【摘要】：针对某小净距近接公路隧道上穿既有输水隧洞的空间位置关系,结合萨道夫斯基公式,对隧道的爆破开挖方案进行优化,并利用Midas GTS数值模拟方法建立计算模型,分析不同开挖区段三种工况下爆破振动对输水隧洞结构安全的影响。研究结果表明:各工况最大振速是由隧道下台阶爆破导致的,为4.33 cm/s,小于根据《爆破安全规程》确定的输水隧洞7 cm/s的最大振速;而最大拉应力及最大压应力分别是0.75 MPa和1.51 MPa,均出现在下台阶爆破施工时,分别小于C25混凝土的设计强度值。通过现场实测得到的最大振速为3.428 cm/s。由此可知,根据设计的爆破开挖方案施工不会影响输水隧洞的安全稳定。
[Abstract]:In view of the spatial position relationship of a small net distance highway tunnel passing through the existing water conveyance tunnel, the blasting excavation scheme of the tunnel is optimized by combining with the Saadolski formula, and the calculation model is established by using the Midas GTS numerical simulation method. The effect of blasting vibration on the structure safety of water conveyance tunnel is analyzed. The results show that the maximum vibration velocity of each working condition is caused by the blasting of the lower step of the tunnel, which is 4.33 cm / s, which is less than the maximum vibration velocity of the water conveyance tunnel determined according to the blasting Safety regulations for 7 cm/s. The maximum tensile stress and maximum compressive stress are 0. 75 MPa and 1. 51 MPA, respectively, which are less than the design strength of C25 concrete during the construction of lower step blasting. The maximum vibration velocity measured in the field is 3.428 cm / s. Therefore, according to the design of blasting excavation scheme construction will not affect the safety and stability of water conveyance tunnel.
【作者单位】：山东理工大学资源与环境工程学院;中南大学资源与安全工程学院;中国非金属材料南京矿山工程有限公司;
【基金】：国家自然科学基金资助项目(51404303) 中南大学“创新驱动计划”项目资助(2015CX005)
【分类号】：U455.6

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