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超前支护是软土隧道中控制工作面、稳定前方地层的通用方法,也用于打通坚岩破碎地段。原有安设超前支护锚杆的方法,容易发生在未安锚杆之前钻孔即坍塌,目前开发了注浆
Advance support is a common method of controlling the working face in soft soil tunnel and stabilizing the front strata. It is also used to break through broken rock sections. The original method of installing anterior supporting anchor is prone to borehole collapse before it is not anchored, and the grouting is currently being developed