Construction method for subway tunnel penetrating through building in fractured rock stratum
2015
The invention discloses a construction method for a subway tunnel penetrating through a building in a fractured rock stratum. The construction method mainly comprises the following steps: firstly utilizing a deep hole grouting process to reinforce a stratum; excavating a tunnel by circularly utilizing mechanical excavation and explosion, and after the excavation of a tunnel face is completed, immediately performing primary support in an anchor rod, bar-mat reinforcement, shotcrete and grid combined support manner till the tunnel penetrates through the building; finally performing grouting reinforcement of a tunnel inner deep hole sleeve valve tube. According to the construction method, by utilizing central mechanical excavation and circumferential smooth blasting techniques, the disturbance of the penetrating-tunnel explosion construction to the fractured rock stratums is reduced, the expansion and growth of rock body internal micro-defects are effectively controlled, the expanding and shaking losses to the building are avoided; due to the field vibration speed monitoring, the explosion vibration speed of a to-be-tested point of the building is within 10 mm/s, which meets the standard requirements.
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