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填埋式地下圆形结构物周边土压力分布,自1930年A.Marston教授提出该课题后,迄今未得满意解答。本文将该课题归结为求解在重力场作用下的二维直线变形介质内嵌有弹性圆环的孔洞应力集中问题,应用有限元法获得如下主要结果;1)沿孔周径向土压力集度呈新月形分布,2)剪力集度呈对纵轴对称的钳形分布;3)提出设计简图和管顶土压力集中系数K_(?)与H/D关系曲线组,供设计查用。 文中除对马氏理论进行商榷外,还对我国铁道、公路、市政、电力、水利等部门有关规范试呈管见。
The distribution of earth pressure around landfill-type underground circular structures has not been satisfactorily answered since Professor A. Marston proposed this subject in 1930. In this paper, the problem is reduced to solve the problem of stress concentration in the hole embedded in the two-dimensional linear deformation medium with elastic ring under the effect of gravity field. The main results are obtained by using the finite element method; 1) The radial pressure concentration along the hole circumference. In a crescent-shaped distribution, 2) Shear strength is symmetrically clamped to the vertical axis; 3) Design sketches and pressure coefficient K_(?) and H/D curves for the top of the tube are proposed for design investigation. use. In addition to discussing the Markov theory, the article also presents opinions on the relevant regulations and tests of the railway, highway, municipal, power, and water conservancy departments in China.