Excess pore water pressure is generated during shield tunnelling

resulting in consolidation settlement. Assuming the disturbance range shape of shield tunnelling is circular arc

the distribution range of excess pore water pressure is determined. The formula of initial excess pore water pressure of soil around tunnel lining is deduced by stress relief theory; and the formula of initial excess pore water pressure of soil within the region of its distribution at any point is subsequently deduced by stress transfer theory. By comparing calculated and measured data

it is shown that they are in good agreement. Based on practical example

a conclusion is drawn that the distribution shape of initial excess pore water pressure of soil around shield tunnel circle is roughly circular (top of small

bottom of large). With the increase of distance from shield tunnel central axis

the initial excess pore water pressure of soil shows a concave curve shape. At the same time

the isopleths at the bottom of shield tunnel changes fastest. Above the top of the tunnel

the initial excess pore water pressure of soil gets the maximum at the tunnel axis in different depths

showing a similar Peck shape.