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水电站的输水管路中,在坡降平缓的地段,一般设置有压或者无压隧洞。无压隧洞多是采用施工较便利的马蹄形断面,而有压隧洞为了避免应力集中,又多半是采用圆形断面。对于圆形隧洞,当复盖层很厚时,即使隧洞周围的岩石的水密性很好,但为了减少水头损失,一般也还是采用混凝土衬砌;由于岩石与衬砌紧密结合,隧洞承受的荷载会传递到岩石。而另一方面,当隧洞周围的岩石含水时,若其力学性能受到破坏则要求衬砌必须具有良好的密实度,并不允许衬砌开裂。本文对厚复盖层的圆形压力隧洞的衬砌问题,提出了一种施工技术人员在现场应用较便
In the pipelines of hydropower stations, there are generally pressured or non-pressure tunnels in areas where the slope is gentle. Most of the pressureless tunnels use horseshoe-shaped sections that are convenient for construction. In order to avoid stress concentration, pressure tunnels mostly use circular sections. For circular tunnels, when the overlay is thick, even if the rock around the tunnel is well watertight, in order to reduce the head loss, concrete linings are generally used; due to the tight integration of the rock and the lining, the load carried by the tunnel will be transmitted. To the rock. On the other hand, when the rock surrounding the tunnel contains water, if its mechanical properties are damaged, the lining must have a good compactness and do not allow the lining to crack. In this paper, a lining of a circular tunnel with a thick overburden is proposed.