Table 5 Impact factor fitting curve of influence factor of soil reaction force.

0.15 m

\(D_{o} = - 0.06217x + 0.0061x^{2} - 5.75149 \times 10^{ - 4} x^{3} + 1.00243\)

0.75 m

\(D_{o} = - 0.10525x + 0.01092x^{2} - 1.02327 \times 10^{ - 4} x^{3} + 1.03349\)

1.35 m

\(D_{o} = - 0.11846x + 0.00984x^{2} - 8.98946 \times 10^{ - 5} x^{3} + 1.03189\)

1.95 m

\(D_{o} = - 0.1193x + 0.01089x^{2} - 9.95919 \times 10^{ - 5} x^{3} + 1.01738\)

2.7 m

\(D_{o} = - 0.10932x + 0.01001x^{2} - 9.05362 \times 10^{ - 5} x^{3} + 1.01212\)