摘要
大金坪水电站为松林河干流河段规划建设的引水式电站,隧洞沿线地质条件复杂。隧洞施工初期,按照圆形断面顶拱进行了一期开挖,根据开挖揭示围岩地质条件及后期工程建设进度的要求,在隧洞布置、设计流量既定,保证电站机组出力不变,确保电站稳定安全运行的情况下进行合理的设计断面优化。对隧洞围岩条件良好洞段,论证取消隧洞原圆形钢筋混凝土衬砌,选定马蹄形锚喷断面作为最终优化断面形式。方法实用方便,满足精度要求。随着中小型水电站实际建设情况,此优化设计可作为隧洞施工中及时进行断面形式调整的一种简捷易行的思路。
Dajinping project is a diversion type hydropower project planned on the Songlin River trunk, the geological conditions along its tunnel are complicated. During early construction, the tunnel is excavated as circular section arch at the first stage. According to the geologic conditions of surrounding rocks exposed by excavation and the requirements of later construction progress, the design section is optimized under the condition that the tunnel layout, design discharge and unit output will not be changed so as to ensure the stable and safe operation of the project. For tunnel sections with good surrounding rocks, the U-shaped rock-bolted section is selected as a final optimized section instead of the original circular reinforcement concrete lining section. The above method is convenient and practical and satisfies the accuracy requirement. Along with the construction of middle and small-sized hydropower projects, the optimal design can be used as a simple and easy concept to timely adjust the section form during tunnel construction.
出处
《西北水电》
2010年第3期38-40,共3页
Northwest Hydropower
关键词
引水式
隧洞
断面
优化设计
diversion-type
tunnel
section
optimal design
