米溪梁隧道特殊地质环境下综合超前预报研究

深埋长大隧道掘进过程中的断层、破碎带等不良地质体是导致地质灾害发生的主要诱因,地质超前预报对不良地质灾害的规避和施工安全具有重要的指导作用。针对米溪梁隧道复杂的地质条件,运用TSP、TRT探测、超前水平钻探、钻心取样、隧道内地质观测分析等方法对隧道前方围岩地质信息开展综合预测预报,为确定施工方案及合理的支护参数提供依据。经施工开挖揭示,预报效果较好,成功地保证了施工安全和质量。

Comprehensive advanced prediction of Mixi Ridge Highway tunnel under special geological condition

The faults, fracture zones and other adverse geological body exist during the construction process of deep-buried long tunnel, often lead to geological disasters, so advanced geological prediction has important role in guiding construction safety. Under complicated geological conditions of Mixi Ridge Highway tunnel, several different methods such as TSP and TRT detection, advanced horizontal drilling, core-drill sampling and geological observation and analysis, etc. were applied to forecast the geologic information of surrounding rock in tunnel facing frontage, this provided basis for the determination of construction program and reasonable supporting parameters. Good effect was achieved by comparing the results of prediction and in-situ measurement, the safety and quality of construction were ensured.