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本文的主题思想是:利用围岩中的地应力,使隧洞衬砌受到预压应力,以减轻衬砌中的拉应力,并在理论上作了探索分析。这是一种有意义的设想。但这一设想还没有在实践中用过,也未做过试验;同时必须边掘进,边衬砌,衬砌段与掘进段的距离要有严格控制;另外还必须事先确定该地区地应力大小,并且λ最好≈1。因此,要使这个设想付诸实现还有一定距离,应用范围也受到一定限制。本刊发表这篇文章的目的,是为了广扩技术思想,对此引起注意和开展有益的研究。
The main idea of this paper is: to make use of the in-situ stress in the surrounding rock to pre-compress the tunnel lining to reduce the tensile stress in the lining, and to make a theoretical exploration and analysis. This is a meaningful assumption. However, this concept has not been used in practice and has not been tested. At the same time, the distance between the lining and the lining section and the tunneling section must be strictly controlled while excavating. In addition, the magnitude of the in-situ stress in the area must be determined, λ is best ≈1. Therefore, there is a certain distance to put this idea into practice, and the scope of application is also limited. This article published the purpose of this article is to widen the technical thinking, which attracted attention and carry out useful research.