地下管道结构力学-Structural-Mechanics-of-Buried-Pipes.pdf

STRUCTURAL MECHANICS OF BURIED PIPES Reynold King Watkins Utah State University Logan, Utah Loren Runar Anderson Utah State University Logan, Utah CRC Press Boca Raton London New York Washington, D.C. ©2000 CRC Press LLC ©2000 CRC Press LLC GENERAL NOTATION Geometry A = cross sectional wall area per unit length of pipe, B = breadth of the trench D = pipe (tank) diameter, H = height of soil cover, h = height of water table, L = length of tank or pipe section, r = radius of curvature of the pipe (tank) cylinder, R = radius of a bend in the pipe, t = thickness of the wall, x = horizontal coordinate axis, y = vertical coordinate axis, z = longitudinal axis (with exceptions), = angle of soil shear plane. Forces, Pressures, and Stresses P = external pressure on the pipe or tank, P = internal pressure, p = vacuum in the pipe or tank, Q = concentrated force, W = surface wheel load, = unit weights, = direct (normal) stress, = shearing stress. Subscripts refer to directions of forces and stresses. Properties of Materials c = cohesion of soil, E = modulus of elasticity of pipe (tank) material, S = allowable stress (strength) of material, = unit weight of material, = Poisson ratio, = soil friction angle. ©2000 CRC Press LLC CONTENTS Chapter 1 Introduction 2 Preliminary Ring Design 3 Ring Deformations 4