堵水注浆在引汉济渭工程岭南TBM施工段的应用研究

引汉济渭工程岭南(秦岭南部)TBM施工段为反坡施工,隧洞突涌水全部通过大功率水泵逐级抽排至洞外。受排水设施布设、隧洞空间、电力供应、工程投资等因素影响,以及TBM掘进段和施工支洞长度均较长的客观条件,突涌水对施工的干扰、影响尤为巨大,特别是较大集中突涌水,对人员、设备安全会造成极大威胁。为保证施工安全的同时TBM掘进正常进行,针对该施工段突涌水处理制定了"以堵为主、堵排结合"的原则,采取常规双液浆堵水注浆和特殊材料堵水注浆相结合的方式,对集中涌水点进行封堵。结果表明,在8个涌水量大、涌水点集中的段落进行堵水注浆,涌水段落实际封堵率超过了99%,满足事先制定的封堵标准。该方法可为同类工程TBM施工提供借鉴。

Study on application of water blocking grouting to Lingnan TBM construction section of Hanjiang to Weihe River Valley Water Diversion Project

The reverse slope construction is applied to Lingnan （South of Qinling mountains） TBM construction section of Hanjiang to Weihe River Valley Water Diversion Project，in which all the gushing water from the tunnel is discharged out with large power water pumps step by step. Under the impacts from the factors of the arrangement of the draining facilities，space of the tunnel，power supply，project investment，etc. as well as the objective conditions of the longer TBM excavation section and the construction adits，the interference and impact from the gushing water on the construction are quite large，especially the large concentrated gushing water can greatly threaten the safeties of workers and equipment therein. In order to ensure the construction safety and the smooth excavation of TBM，a construction principle of “mainly blacking and combining blocking with draining” is made for the treatment of the gushing water occurred in that construction section，for which a mode of combining the conventional dual slurry water blocking grouting with special material grouting is adopted for blocking the concentrated water gushing point. The result shows that the water blocking groutings are carried out for 8 sections with large water gushing and concentrated gushing points，for which the actual blocked rates are over 99%，thus meet the blocking standard made beforehand. The method can provide a reference for TBM construction of the similar project.