新建隧道下穿昆河铁路爆破施工安全性分析

Safety Analysis of Blasting Construction of Newly-Built Tunnel Under-Crossing Kunhe Railway

对庄寨水库至碧色寨引水连通工程新建隧道下穿昆河铁路的3个位置进行爆破施工安全性分析。通过有限差分数值软件,对K0+109.7,K2+290.1,K4+036.2位置进行爆破开挖数值模拟分析。结论如下:K0+109.7,K4+036.2段爆破施工对既有铁路造成影响较大,不满足安全控制要求,建议采取非爆开挖,并对围岩采取加固措施;K2+290.1段爆破施工对既有铁路造成的影响在控制标准内,建议施工断面应采取控制爆破并对围岩采取一定的加固措施。研究内容可为新建隧道下穿既有铁路爆破开挖的相关工作提供参考。

This paper analyzes the safety of blasting construction at three locations of the newly built tunnel from Zhuangzhai reservoir to Bisezhai water diversion connecting project passing through Kunhe railway.Through the finite difference numerical software,the blasting excavation numerical simulation analysis of K0+109.7,K2+290.1,K4+036.2 is carried out.The conclusions are as follows:K0+109.7,K4+036.2 blasting construction has a great impact on the existing railway,which does not meet the safety control requirements.It is recommended to adopt non blasting excavation and take reinforcement measures for surrounding rock;the impact of blasting construction of K2+290.1 section on the existing railway is within the control standard,and it is suggested that the construction section should adopt controlled blasting and take certain reinforcement measures for surrounding rock.The research content can provide reference for the blasting excavation of new tunnel under existing railway.