面对极端挑战，项目团队以技术创新为突破口，为攻克长距离高强硬岩复合地层掘进难题，项目团队通 过应用添加剪切强度超350MPa具有自主知识产权的特殊耐磨涂层和优化刀盘设计，大幅提升刀具耐磨 性和耐久性，最终创下长距离硬岩地层全区间一次连续掘进"零开仓、零换刀"。同时，针对硬岩地层易 导致管片上浮的行业难题，项目部通过严格控制掘进参数、优化调整同步注浆流动扩展度、凝固时间及 注浆压力，结合实时监测数据动态优化注浆工艺，有效抑制管片上浮，确保隧道管片拼装一次成优，基 本实现成型隧道管片"无明显错台、无破损、无渗漏水"和衬砌结构内实外美。历经7个月的日夜奋战， 最终实现安全、优质、高效顺利贯通。 据中铁电气化局项目负责人介绍，针对38‰连续超大坡度带来的运输轨行车辆易溜逸风险，项目部自主 研制了集清扫、吹干、撒砂功能于一体的轨面处理装置，该装置能显著提升轨面附着力，彻底解决了大 坡度隧道内运输安全隐患，为施工全程的运输畅通提供了有力保障。此外，在穿越梁滩河富水砂泥岩层 施工中，通过增加注浆加固和渣土改良优化同步注浆和二次注浆，成功实现保压掘进，本区间四次安全 穿越梁滩河支流，避免了涌水、涌砂、地面坍塌等风险。 12月 ...

Core Points - The "Electric Pioneer" TBM (Tunnel Boring Machine) has commenced operation, marking the start of the shield tunneling phase for the Chongqing Rail Transit Line 7 Phase I project, which spans approximately 28 kilometers and includes 18 stations [1][2] - The project aims to enhance the north-south transportation capacity in Chongqing, connecting various urban clusters and facilitating transfers with existing and under-construction rail lines [2] Group 1: Project Overview - The Chongqing Rail Transit Line 7 Phase I will connect key areas such as Xiyong, Hangu, and Jinfeng, with a total length of about 28 kilometers and 18 stations [1] - The tunneling section includes a 3.3-meter shallow cover segment and a challenging 1,332-meter segment with a 38‰ gradient, requiring significant engineering solutions [1] Group 2: Technical Specifications - The "Electric Pioneer" TBM has a working length of 85 meters, a diameter of 6.84 meters, and weighs approximately 500 tons, with a main drive power of 945 kW and a maximum thrust of 4,344 tons [2] - The TBM is designed to achieve an average daily advance rate of 9 to 12 meters while performing excavation, support, and ventilation tasks [2] Group 3: Engineering Innovations - The construction team has implemented 3D simulation technology for advanced planning and developed an intelligent control system for real-time data analysis to ensure efficient tunneling [1] - A special wear-resistant layer with a shear strength exceeding 350 MPa has been added to the TBM's cutting tools to enhance durability against hard rock formations [1]