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前言喷射混凝土具有施工速度快、效率高、工艺简单、力学性能好、不需要模板等一系列优点,因此被广泛地用于土建工程,特别是用于地下工程施工。如在隧洞开挖后,为使洞壁表面平整光滑,减少局部应力集中,加固岩石表层,防止岩体由于空气、水的渗入而发生风化现象,都需要喷射混凝土。目前为了加快隧洞的掘进速度,国外纷纷推广采用“新奥法”快速施工工艺,这就更离不开采用喷射混凝土或喷射混凝土与岩石锚杆
Foreword Sprayed concrete has the advantages of fast construction speed, high efficiency, simple process, good mechanical properties, no need of template and so on, so it is widely used in civil engineering, especially for underground construction. As in the tunnel excavation, in order to make the surface smooth and smooth, reduce the local stress concentration, strengthening the rock surface, to prevent the rock due to air and water infiltration and weathering phenomenon, the need to spray concrete. At present, in order to speed up tunneling, foreign countries have promoted the “New Austrian Law” rapid construction technology, which is even more inseparable from the use of sprayed concrete or shotcrete and rock bolt