皂市导流洞洞口段上层开挖施工安全技术措施

Technical Measures for Safe Excavating of the Upper Portal of the Head-Tunnel in Zhao City

本文根据皂市电站导流洞洞身上层的地质地形条件 ,为保证工程开挖安全 ,就洞口预加固、超前支护、工程爆破和开挖施工方案进行了详细分析和设计 ,并进行了现场监测监控 ,结果表明 ,本导流洞的支护和开挖结构体系是安全的 ,达到了导流洞开挖和围护工程的安全与稳定要求 ,对类似工程具有指导和借鉴意义。

This paper gives a detailed description of the safety measures taken for the upper portal of Zhao City head-tunnel for hydro electricity. Careful analysis and design were made for the reinforcement, the pre-support of the upper portal and the blasting based on the local geotechnical conditions. The supervision results indicated that the supporting construction was safe and met the need for stability, and the working parameters were rational. This experience offered guidance and reference for other similar construction projects.