海底隧道断层破碎带信息化施工

海底隧道开挖支护施工难度很大、安全风险极高,结合国内第二条海底隧道断层破碎带施工。采用地质调查、隧道地震勘探法(TSP法)、隧道内超前钻孔等方法,通过数据分析处理,预测了掌子面前方45 m范围内的基本地质条件,如岩性、规模、位置的长期超前地质预报,以及精度较高的短期超前地质预报,据此综合超前地质预报结果,采取上半断面全断面超前预注浆加固地层、台阶法开挖、加强支护。同时,对施工中水平收敛、拱顶下沉等监控量测数据进行分析,动态反馈于施工过程中,此即海底隧道断层破碎带信息化施工。该方法在施工中取得令人满意的结果。

Information construction of the subsea tunnel in a fault and crush zone

The construction of the excavation and support of the subsea tunnel is very difficult, and safety risk is also very high. Relying on the construction of a fault and crush zone of the second subsea tunnel inland, using the method of geologic survey, TSP, flank holes, and analyzing the data, predicting basis geology condition within 45 meters ahead of working face. Combining long term geology prediction with short term geology prediction, comprehensive pre geology prediction is reported. According to its geological property, adopting full sectional grouting upper section in the fault and crush zone in order to strengthen stratum, bench excavation method, and strong support. At the same time, monitoring and measuring convergence, subsidence of crown, and pressure of surrounding rock, by processing of data, and to the construction, is called the information construction of the subsea tunnel in a fault and crush zone. The method is applied to the construction, produces a satisfactory effect.