竖井不良地质洞段开挖专项处理方案研究——以牛栏江-滇池补水工程进水口为例

地下复杂不良地质洞室开挖是相当困难的,特别是竖井开挖遇大溶蚀充填物,必须采取切实有效支护措施,才能保证施工安全、施工质量和施工进度。以牛栏江-滇池补水工程干河泵站进水口检修闸门竖井开挖遇地下溶蚀群充填物处理为例,首先对溶蚀面进行清理,初喷混凝土封闭,搭建施工平台并立模,对空腔回填混凝土,并实施回填和固结灌浆处理,根据溶蚀群的形成和分析推理施以长锚杆与锚索相结合的方式对竖井溶蚀一次固壁处理。详细阐释了竖井开挖遇溶蚀时加强支护处理的相应措施,方案实施后效果明显,安全和质量得到保证,可为其他类似工程提供借鉴。

Analysis on special treatment scheme for poor geological tunnel section in vertical shaft excavation: case of water intake of water diversion project from Niulanjiang River to Dianchi Lake

It is a tough work to excavate tunnels in poor geological zone, especially when the vertical shaft construction encounters massive dissolve filling materials. It’s necessary to take effective protection measures to ensure the construction security, quality and schedule. In the construction of the vertical shaft for maintenance sluice of the water intake, the Ganhe pumping station of the water diversion project from Niulanjiang River to Dianchi Lake, we firstly cleared the dissolve surface and sprayed concrete for sealing it, then constructed a platform and erected formwork for concrete grouting-filling and consolidation. According to the formation of the dissolution caves, we adopted combined measures of long anchor rod and anchor cable to reinforce the shaft wall. This paper presents the supporting measures for the vertical shaft in excavation process. The treatment measures were proved to be effect by practices.