天心山隧道进口段软弱膨胀围岩的开挖与支护

Construction Techniques for Excavation and Support of Soft Swelling Wall Rock at the Threshold Zone of Tianxinshan Tunnel on Ganzhou-Longyan Railway

根据赣龙铁路天心山隧道进口段软弱膨胀围岩段的设计要求,结合该段的地质和施工情况,对超前小导管双液注浆预支护、迈式自进式锚杆超前预支护、可缩性工字钢架加强支护、喷射钢纤维混凝土和锁脚导管等工序做了较详细的阐述。

This paper, according to the design requirement of soft swelling wall rock section at the threshold zone of Tianxinshan Tunnel on Ganzhou-Longyan railway, based on the actual geological conditions and construction at this section, makes detailed descriptions of major working procedures such as pre-support with leading tremie two-fluid grouting, leading pre-support with striding self-driven rockbolt, strengthening support with contractible steel I-beam, spraying steel fiber concrete and locking tremie, etc.