旭龙水电站是金沙江上游“一库13级”水电规划的第12级，是国家“十四五”期间核准在建装机容量最大水电站，电站装机240万千瓦，电站建成后，年发电量约105亿千瓦时，每年可节约标准煤315万吨。母线洞是连接主厂房与主变室的重要通道，旭龙水电站共设4条母线洞，平行布置于主厂房下游侧，洞轴线与厂房轴线垂直。母线洞断面为圆拱直墙型，共分5层开挖。面对复杂的隧洞关系，施工过程中严格控制爆破震动，减少对紧邻隧洞的影响，母线洞采用奇偶号分序开挖完成。

自母线洞开始施工以来，金沙江旭龙公司克服斜长角闪岩条带、岩爆、长大裂隙发育、掉块等作业困难，充分发挥业主主导作用，精心优化施工方案，严格落实“短进尺、多循环、强支护”施工要求，精确控制爆破震动，高质量完成4条母线洞I层开挖，为按期实现地下厂房主变洞节点工期目标创造了有利条件。

Xulong Hydropower Station is the upper reaches of the Jinsha River "one reservoir 13" hydropower plan of the 12th level, is the national "14th Five-Year Plan" period approved the installed capacity of the largest hydropower station under construction, the installed capacity of the power station is 2.4 million kilowatts, after the completion of the power station, the annual power generation of about 10.5 billion KWH, can save 3.15 million tons of standard coal every year. Bus hole is an important channel connecting the main plant and the main transformer room. There are 4 bus hole in Xulong Hydropower Station, which are arranged parallel to the downstream side of the main plant, and the axis of the hole is perpendicular to the axis of the plant. The section of the bus tunnel is circular arch and straight wall type, and the excavation is divided into 5 layers. In the face of complex tunnel relationship, blasting vibration is strictly controlled in the construction process to reduce the influence on the adjacent tunnel.

Since the beginning of the construction of the bus-bar hole, Jinshajiang Xulong Company has overcome the difficulties of operation such as ancline hornblande strip, rock burst, long crack development, falling block, etc., given full play to the leading role of the owner, carefully optimized the construction plan, strictly implemented the construction requirements of "short penetration, multi-cycle, strong support", accurately controlled the blasting vibration, and completed the excavation of the I layer of 4 bus-bar holes with high quality. The favorable conditions are created for realizing the construction period target of the main tunnel node of the underground plant on schedule.