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在当前的坑道掘进中，对硬岩破碎地层施工，为求得坑道围岩的稳定，除了在开挖工艺上采取措施外，一般均对坑道围岩表面及时地用混凝土或水泥砂浆进行喷射支护，以提高坑道围岩的整体承载能力。下面就以我队在某输水管路隧道施工为例，说明施喷工艺参数的改变对喷射混凝土回弹率的影响。
In the current excavation of tunnel, hard rock crushed stratum construction, in order to obtain the stability of the tunnel surrounding rock, in addition to the excavation process to take measures, generally on the tunnel wall rock surface with concrete or cement mortar jet branch Protection, to improve the overall carrying capacity of tunnel surrounding rock. The following is my team in a water pipeline tunnel construction as an example to explain the spraying process parameters on the impact of the rebound rate of shotcrete.