论文部分内容阅读
一、前言 喷混凝土是将一定比例的水泥、砂、石均匀搅拌后,借助压缩空气为动力,使干混合料连续地沿输料管送至喷头处,与水混合后,以较高速度喷射在岩面上,凝结硬化而成。实践证明:喷锚支护作为隧道衬砌,可以加固围岩抑制山体压力的产生和发展;同时,形成组合结构,良好地支护已经形成且数量不大的围岩压力。这样,可以减薄衬砌厚度,节省材料,提高机械化水平,加快施工进度。近十年来,铁道部门已有30公里隧道采用喷锚支护,并取
I. Introduction Sprayed concrete is a certain proportion of cement, sand, stone uniform mixing, with compressed air as a driving force, so that the dry mix along the delivery pipe to the nozzle, mixed with water, spray at a higher speed On the rock surface, condensation hardens. Practice has proved that spray-anchor support can be used as tunnel lining to reinforce surrounding rock to restrain the generation and development of mountain pressure. At the same time, the composite structure is formed to well support the rock mass which has been formed and is not large in size. In this way, you can reduce the lining thickness, save material, improve the mechanization level, speed up the construction progress. In the past ten years, 30 km of tunnels have been supported by spray anchors in the railway sector and taken