Estimation of the Earth Pressure Acting on a Shaft Lining

Various formulae for the purpose of estimating the earth pressure which acts on a shaft lining have so far been proposed. Each of all these formulae has been derived under some comparatively simple assumptions. Although some of these formulae seem to be fairly pertinent for a ground of a certain character, such as homogeneous Quarternary system, it seems to be unreasonable, in many cases, to estimate the earth pressure by the aid of these formulae, while the nature and the conditions of a ground are fairly compricated in general. In this article, therefore, the author described a method for estimating the earth pressure which acts on the outer wall of a shaft lining utilizing the results of measurement of stresses which arise on the inner wall surface of the lining. The author further refered to estimation of the earth pressure by the nature and conditions of a ground surrounding a shaft.