北宜高速公路雪山隧道工程豎井地質弱帶處理施工案例探討

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Abstract The shaft No.2 keeps stable without any ground treatment even though it was located on the north limb of the Taotiaotzu Syncline. But shaft No.3 is in the sandstone formation of Szeleng Formation in Eocene，in which rock masses are fractured and highly permeable with large amount of groundwater. Under these conditions，the ground treatment should be adapted to keep the construction continue. The liquid glass grouting method in short-stage was performed in the exhausted-air shaft，and the bentonite-cement grouting method in long-stage in the fresh-air shaft. Because of the poor geology and geotechnical conditions，the bentonite-cement grouting method in long-stage is performed on the shaft No.1 in a monocline of the south limb of the Yingtzulai Syncline. Now，the works of excavation on shaft No.2 and shaft No.3 have been finished，and the pilot-hole drilling with raise-boring method is going on. The geotechnical characteristics of the geologically-weak zones and the principles of the ground treatments are discussed.

Key words： tunneling engineering mixing-excavation method liquid glass grouting traditional sinking-down method bentonite-cement grouting

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https://rockmech.whrsm.ac.cn/EN/Y2004/V23/IS2/4685