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Newmark's influence chart
Newmark’s Influence Chart is an illustration used to determine the vertical pressure at any point below a uniformly loaded flexible area of soil of any shape. This method, like others, was derived by integration of Boussinesq’s equation for a point load.〔Das, Braja M. ''Principles of Geotechnical Engineering''. 6. Toronto: Thomson, 2006.〕
==Background==
Newmark obtained values of R/z that corresponded to various pressure ratios by using the equation (R/z)=√((1-(〖∆σ〗_z/q)^(-2/3)-1), where R = the radial distance away from the point at which the load is applied, z = the vertical depth below the applied load, 〖∆σ〗_z = the stress at the point of interest a depth of z below the surface, and q = the load per unit area applied at the surface.〔 Using the pressure ratios obtained from the equation above, he was able to form the influence chart.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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