# Chapter14:Soil Improvement and Ground Modification¶

## Ex14.1:Pg-695¶

In [6]:
#example 14.1

import math
Cc=0.28;
Hc=6.0;
eo=0.9;
Cv=0.36; # in m^2/mo.
H=3.0; # in m
t=9.0; # in mo.
sigmao=210.0;# in kN/m^2
sigmap=115; #deltasigmap in kN/m^2
Sc=Cc*Hc/(1+eo)*math.log10((sigmao+sigmap)/sigmao); # in m
print round(Sc*1000,1),"primary consolidation in mm"
Tv=Cv*t/H**2;
#from table
k=1.8; #constant
sf=k*sigmap; # in kN/m**2
print round(sf,2),"deltasigmaf in kN/m**2"

167.7 primary consolidation in mm
207.0 deltasigmaf in kN/m**2


## Ex14.2:Pg-703¶

In [9]:
#example 14.2

import math
Tv=0.36;
sigmap=115; # in kN/m^2
Uv=math.sqrt(4*Tv/math.pi)*100;
print round(Uv,2),"Uv in %"
#from table
k=0.12; #constant
sf=k*sigmap;
print sf,"deltasigmaf in kN/m**2"

67.7 Uv in %
13.8 deltasigmaf in kN/m**2


## Ex14.3:Pg-704¶

In [12]:
#example 14.3

Cc=0.31;
Hc=15.0;#ft
eo=1.1;
n=10.0;
Uv=0.09;
sigmao=1000.0; # in lb/ft^2
deltasigma=2000.0; # deltasigmap+deltasigmaf
Sc=Cc*Hc/(1+eo)*math.log10((sigmao+deltasigma)/sigmao);
print round(Sc,3),"primary consolidation in ft"
m=n**2/(n**2-1)*math.log(n)-(3*n**2-1)/4/n**2;
A=2/m;
Ur=(0.096-1/A*(1-math.exp(-A*0.096)))/0.192;
Uvf=1-(1-Ur)*(1-Uv);
Sc30=Sc*Uvf*12; #settlement after 30 days
print round(Sc30,2),"settlement after 30 days in inch"

1.056 primary consolidation in ft
1.48 settlement after 30 days in inch